H3C SR6600-F路由器典型配置举例-R7607-6W101

03-H3C SR6600-F路由器 BFD典型配置举例

H3C SR6600-F BFD典型配置举例

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3.4.3 配置Device A的BFD功能

4.4.3 配置Device A的BFD参数

7.4.2 在AS 100内配置OSPF功能，保证设备间路由可达

8.4.3 配置Device A上的路由策略

8.4.4 配置BFD功能，并创建和BFD会话关联的Track项11，检测Device B是否可达

1 简介

本文档介绍了BFD配置举例。

2 配置前提

本文档中的配置均是在实验室环境下进行的配置和验证，配置前设备的所有参数均采用出厂时的缺省配置。如果您已经对设备进行了配置，为了保证配置效果，请确认现有配置和以下举例中的配置不冲突。

本文假设您已了解BFD特性、Track特性以及OSPF、IS-IS等路由协议。

3 静态路由与BFD联动配置举例

3.1 组网需求

某公司内部网络如图3-1所示，从Device A到Device B有两条转发路径，下一跳分别为Device B和Device C。由于Device A和Device B之间物理距离较远，通过一个二层交换机L2 Switch作为中继。假设Device B不支持BFD，要求在Device A上使用静态路由与BFD联动技术，实现当Device B与二层交换机L2 Switch之间的链路出现故障（如链路down）时，Device A能快速感知，并将流量切换到Device C的链路上。

图3-1 静态路由与BFD联动配置组网图

设备	接口	IP地址	设备	接口	IP地址
Device A	XGE3/1/1	192.168.10.101/24	Device B	XGE3/1/1	192.168.10.102/24
	XGE3/1/2	192.168.20.101/24		XGE3/1/2	192.168.30.101/24
	XGE3/1/3	192.168.40.101/24		XGE3/1/3	192.168.50.101/24
Device C	XGE3/1/1	192.168.20.102/24
	XGE3/1/2	192.168.30.102/24

3.2 配置思路

· 由于需要两端设备均支持BFD，才能够使用控制报文方式，本例中Device B不支持BFD，在Device A上配置的BFD功能仅能使用echo报文方式。

· echo报文方式下必须配置echo报文的源IP地址。IP地址可以任意指定，不需要与实际接口地址对应。建议不要将echo报文的源IP地址配置为属于该设备任何一个接口所在网段，避免对端发送大量的ICMP重定向报文造成网络拥塞。

3.3 使用版本

本举例是在R7607版本上进行配置和验证的。

3.4 配置步骤

3.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

<DeviceA> system-view

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] ip address 192.168.10.101 24

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 请参考以上方法配置图3-1中其它接口的IP地址，配置步骤这里省略

3.4.2 配置静态路由

(1) 配置Device A

# 配置Device A到192.168.50.0/24网段的静态路由，Device A到Device B的流量优先走Device A –> L2 Switch–> Device B链路，当此链路发生故障时，流量切换到Device A –> Device C–> Device B链路上。

[DeviceA] ip route-static 192.168.50.0 24 ten-gigabitethernet 3/1/1 192.168.10.102 bfd echo-packet

[DeviceA] ip route-static 192.168.50.0 24 ten-gigabitethernet 3/1/2 192.168.20.102 preference 65

(2) 配置Device B

# 配置Device B到192.168.40.0/24网段的静态路由，Device B到Device A的流量优先走Device B –> L2 Switch–> Device A链路，当此链路发生故障时，流量切换到Device B –> Device C–> Device A链路上。

[DeviceB] ip route-static 192.168.40.0 24 ten-gigabitethernet 3/1/1 192.168.10.101

[DeviceB] ip route-static 192.168.40.0 24 ten-gigabitethernet 3/1/2 192.168.30.102 preference 65

(3) 配置Device C

# 配置Device C到192.168.40.0/24和192.168.50.0/24网段的静态路由。

[DeviceC] ip route-static 192.168.40.0 24 ten-gigabitethernet 3/1/1 192.168.20.101

[DeviceC] ip route-static 192.168.50.0 24 ten-gigabitethernet 3/1/2 192.168.30.101

3.4.3 配置Device A的BFD功能

# 静态路由支持的BFD会话方式为echo报文方式，该方式下必须配置BFD echo报文的源IP地址。IP地址可以任意指定，不需要与实际接口地址对应。建议不要将BFD echo报文的源IP地址配置为属于该设备任何一个接口所在网段。

[DeviceA] bfd echo-source-ip 10.10.10.10

# 配置接口接收BFD echo报文的最小时间间隔为100ms，单跳BFD检测时间倍数为3。

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-echo-receive-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-Ten-GigabitEthernet3/1/1] quit

3.5 验证配置

(1) Device A和Device B设备及之间的链路均正常工作时

# 在Device A查看静态路由信息。

[DeviceA] display ip routing-table protocol static

Summary Count : 2

Static Routing table Status : <Active>

Summary Count : 2

Destination/Mask Proto Pre Cost NextHop Interface

192.168.50.0/24 Static 60 0 192.168.10.102 XGE3/1/1

Static Routing table Status : <Inactive>

Summary Count : 0

以上显示信息表示Device A经过L2 Switch到达Device B。

# 查看BFD会话。

[DeviceA] display bfd session

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Echo Mode:

LD/RD SourceAddr DestAddr State Holdtime Interface

67 192.168.10.101 192.168.10.102 Up 300ms XGE3/1/1

以上显示信息表示BFD会话已经创建。

(2) Device B与L2 Switch之间的链路出现故障时

# 查看静态路由。

[DeviceA] display ip routing-table protocol static

Summary Count : 1

Static Routing table Status : <Active>

Summary Count : 1

Destination/Mask Proto Pre Cost NextHop Interface

192.168.50.0/24 Static 65 0 192.168.20.102 XGE3/1/2

Static Routing table Status : <Inactive>

Summary Count : 0

以上显示信息表示Device A经过Device C到达Device B。

3.6 配置文件

· Device A：

bfd echo-source-ip 10.10.10.10

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.10.101 255.255.255.0

bfd min-echo-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.20.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 192.168.40.101 255.255.255.0

ip route-static 192.168.50.0 24 Ten-GigabitEthernet3/1/1 192.168.10.102 bfd echo-packet

ip route-static 192.168.50.0 24 Ten-GigabitEthernet3/1/2 192.168.20.102 preference 65

· Device B：

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.10.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.30.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 192.168.50.101 255.255.255.0

ip route-static 192.168.40.0 24 Ten-GigabitEthernet3/1/1 192.168.10.101

ip route-static 192.168.40.0 24 Ten-GigabitEthernet3/1/2 192.168.30.102 preference 65

· Device C：

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.20.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.30.102 255.255.255.0

ip route-static 192.168.40.0 24 Ten-GigabitEthernet3/1/1 192.168.20.101

ip route-static 192.168.50.0 24 Ten-GigabitEthernet3/1/2 192.168.30.101

4 RIP与BFD联动配置举例

4.1 组网需求

如图4-1所示，某公司通过一台二层交换机作为中继将两个相距较远的部门连接。Device A、Device B、Device C上运行RIP，建立RIP邻居关系，保证网络层相互可达。

公司希望在Device A上使用RIP与BFD联动技术，实现当Device C与二层交换机之间的链路出现故障（如链路down）时，BFD能够快速感知并通告RIP协议。

已知Device C不支持BFD功能，公司希望使用RIP与BFD联动技术，采用BFD echo报文方式实现当Device A或Device C与二层交换机之间的链路出现故障时，BFD能够快速感知并通告RIP协议。

现要求通过在Device A和Device C上配置RIP与BFD联动功能，实现：

· 监测通过L2 Switch通信的链路；

· 当链路出现故障时设备能够快速感知并通告RIP协议，快速切换到Device B链路进行通信。

图4-1 RIP与BFD联动配置组网图

设备	接口	IP地址	设备	接口	IP地址
Device A	XGE3/1/1	10.1.0.101/24	Device B	XGE3/1/1	192.168.0.102/24
	XGE3/1/2	192.168.0.101/24		XGE3/1/2	13.1.1.101/24
	XGE3/1/3	120.1.1.1/24
Device C	XGE3/1/1	10.1.0.102/24
	XGE3/1/2	13.1.1.102/24
	XGE3/1/3	121.1.1.1/24

4.2 配置思路

· 由于需要两端设备均支持BFD，才能够使用控制报文方式，本例中Device C不支持BFD，在Device A上配置的BFD功能仅能使用echo报文方式。

4.3 使用版本

本举例是在R7607版本上进行配置和验证的。

4.4 配置步骤

4.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] ip address 10.1.0.101 24

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 请参考以上方法配置图4-1中其它接口的IP地址，配置步骤这里省略

4.4.2 配置RIP基本功能

(1) 配置Device A

# 配置Device A的RIP基本功能，引入直连路由，并使能RIP的BFD功能。

<DeviceA> system-view

[DeviceA] rip 1

[DeviceA-rip-1] version 2

[DeviceA-rip-1] undo summary

[DeviceA-rip-1] network 10.1.0.0

[DeviceA-rip-1] network 192.168.0.0

[DeviceA-rip-1] import-route direct

[DeviceA-rip-1] quit

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] rip bfd enable

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 配置Device B

# 配置Device B的RIP基本功能，引入直连路由。

<DeviceB> system-view

[DeviceB] rip 1

[DeviceB-rip-1] version 2

[DeviceB-rip-1] undo summary

[DeviceB-rip-1] network 192.168.0.0

[DeviceB-rip-1] network 13.1.1.0

[DeviceB-rip-1] import-route direct

[DeviceB-rip-1] quit

(3) 配置Device C

# 配置Device C的RIP基本功能，引入直连路由。

<DeviceC> system-view

[DeviceC] rip 1

[DeviceC-rip-1] version 2

[DeviceC-rip-1] undo summary

[DeviceC-rip-1] network 10.1.0.0

[DeviceC-rip-1] network 13.1.1.0

[DeviceC-rip-1] import-route direct

[DeviceC-rip-1] quit

4.4.3 配置Device A的BFD参数

# RIP支持的BFD会话方式为echo报文方式，该方式下必须配置BFD echo报文的源IP地址。IP地址可以任意指定，不需要与实际接口地址对应。建议不要将BFD echo报文的源IP地址配置为属于该设备任何一个接口所在网段。

[DeviceA] bfd echo-source-ip 11.11.11.11

# 配置接口接收BFD echo报文的最小时间间隔为100ms，单跳BFD检测时间倍数为3。

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-echo-receive-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-Ten-GigabitEthernet3/1/1] quit

4.5 验证配置

# 查看Device A上BFD会话信息，显示BFD会话已被创建，且状态为Up。

[DeviceA] display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Echo Mode:

Local Discr: 2049

Source IP: 10.1.0.101 Destination IP: 10.1.0.102

Session State: Up Interface: Ten-GigabitEthernet3/1/1

Hold Time: 300ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 464 Tx Count: 465

Connect Type: Direct Running Up for: 00:00:46

Detect Mode: Async Slot: 0

Protocol: RIP

Diag Info: No Diagnostic

# 查看Device A上学到的路由121.1.1.0/24，可以看到Device A经过L2 Switch到达Device C。

<DeviceA> display ip routing-table 121.1.1.0 24 verbose

Summary Count : 1

Destination: 121.1.1.0/24

Protocol: RIP Process ID: 1

SubProtID: 0x1 Age: 04h20m37s

Cost: 1 Preference: 100

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 10.1.0.102

Flags: 0x1008c OrigNextHop: 10.1.0.102

Label: NULL RealNextHop: 10.1.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/1

BkTunnel ID: Invalid BkInterface: N/A

# 当Device C和二层交换机之间的链路发生故障，BFD快速检测到链路发生变化并立刻通告RIP。

%Oct 9 18:42:17:650 2017 Device A BFD/5/BFD_CHANGE_FSM: -MDC=1;Sess[10.1.0.101/10.1.0.102, LD/RD:2049/2049, Interface: Ten-GigabitEthernet3/1/1, SessType:Echo, LinkType:INET] , Sta: UP-> DOWN, Diag:1

# 查看Device A上学到的路由121.1.1.0/24，可以看到Device A经过Device B到达Device C。

<DeviceA> display ip routing-table 121.1.1.0 24 verbose

Summary Count : 1

Destination: 121.1.1.0/24

Protocol: RIP Process ID: 2

SubProtID: 0x1 Age: 04h20m37s

Cost: 2 Preference: 100

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 192.168.0.102

Flags: 0x1008c OrigNextHop: 192.168.0.102

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-Ten-GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

4.6 配置文件

· Device A：

bfd echo-source-ip 11.11.11.11

rip 1

undo summary

version 2

network 10.0.0.0

network 192.168.0.0

import-route direct

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.101 255.255.255.0

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.0.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 120.1.1.1 255.255.255.0

· Device B：

rip 1

undo summary

version 2

network 192.168.0.0

network 13.1.1.0

import-route direct

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.0.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.101 255.255.255.0

· Device C：

rip 1

undo summary

version 2

network 10.1.0.0

network 13.1.1.0

import-route direct

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.102 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 121.1.1.1 255.255.255.0

5 OSPF与BFD联动配置举例

5.1 组网需求

如图5-1所示，某公司通过一台二层交换机作为中继将两个相距较远的部门连接。Device A、Device B、Device C上运行OSPF，建立OSPF邻居关系，保证网络层相互可达。

已知Device A和Device C都支持BFD功能，要求使用OSPF与BFD联动技术，采用BFD控制报文方式实现当Device A或Device C与二层交换机之间的链路出现故障（如链路down）时，BFD能够快速感知并通告OSPF协议。

现要求通过在Device A和Device C上配置OSPF与BFD联动功能，实现：

· 监测通过L2 Switch通信的链路；

· 当链路出现故障时设备能够快速感知并通告OSPF协议，快速切换到Device B链路进行通信。

图5-1 OSPF与BFD联动配置组网图

设备	接口	IP地址	设备	接口	IP地址
Device A	XGE3/1/1	10.1.0.101/24	Device B	XGE3/1/1	192.168.0.102/24
	XGE3/1/2	192.168.0.101/24		XGE3/1/2	13.1.1.101/24
	XGE3/1/3	120.1.1.1/24
Device C	XGE3/1/1	10.1.0.102/24
	XGE3/1/2	13.1.1.102/24
	XGE3/1/3	121.1.1.1/24

5.2 配置思路

Device A和Device C都支持BFD，可以使用BFD控制报文方式，通信双方至少要有一方运行在主动模式才能成功建立起BFD会话。

5.3 使用版本

本举例是在R7607版本上进行配置和验证的。

5.4 配置步骤

5.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

<DeviceA> system-view

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] ip address 10.1.0.101 24

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 请参考以上方法配置图5-1中其它接口的IP地址，配置步骤这里省略

5.4.2 配置OSPF基本功能

(1) 配置Device A

# 配置Device A的OSPF基本功能，并使能OSPF的BFD功能。

[DeviceA] ospf

[DeviceA-ospf-1] area 0

[DeviceA-ospf-1-area-0.0.0.0] network 10.1.0.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 120.1.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] quit

[DeviceA-ospf-1] quit

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] ospf bfd enable

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 配置Device B

# 配置Device B的OSPF基本功能。

[DeviceB] ospf

[DeviceB-ospf-1] area 0

[DeviceB-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] quit

[DeviceB-ospf-1] quit

(3) 配置Device C

# 配置Device C的OSPF基本功能，并使能OSPF的BFD功能。

[DeviceC] ospf

[DeviceC-ospf-1] area 0

[DeviceC-ospf-1-area-0.0.0.0] network 10.1.0.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 121.1.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] quit

[DeviceC-ospf-1] quit

[DeviceC] interface ten-gigabitethernet 3/1/1

[DeviceC-Ten-GigabitEthernet3/1/1] ospf bfd enable

[DeviceC-Ten-GigabitEthernet3/1/1] quit

5.4.3 配置BFD功能

(1) 配置Device A

# 配置BFD会话建立前的运行模式为主动模式（缺省为主动模式）。

[DeviceA] bfd session init-mode active

# 配置发送和接收单跳BFD控制报文的最小时间间隔都为100ms，单跳BFD检测时间倍数为3。

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 配置Device C

# 配置BFD会话建立前的运行模式为主动模式（缺省为主动模式）。

[DeviceC] bfd session init-mode active

# 配置发送和接收单跳BFD控制报文的最小时间间隔都为100ms，单跳BFD检测时间倍数为3。

[DeviceC] interface ten-gigabitethernet 3/1/1

[DeviceC-Ten-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceC-Ten-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceC-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceC-Ten-GigabitEthernet3/1/1] quit

5.5 验证配置

# 检查Device A连接的主机host A（120.1.1.2）到Device C连接的主机host C（121.1.1.2）是否可达。

<host A> ping 121.1.1.2

PING 121.1.1.2 (121.1.1.2): 56 data bytes

56 bytes from 121.1.1.2: seq=0 ttl=128 time=22.43 ms

56 bytes from 121.1.1.2: seq=1 ttl=128 time=7.17 ms

56 bytes from 121.1.1.2: seq=2 ttl=128 time=8.91 ms

56 bytes from 121.1.1.2: seq=3 ttl=128 time=7.45 ms

56 bytes from 121.1.1.2: seq=4 ttl=128 time=9.11 ms

--- 121.1.1.2 ping statistics ---

5 packets transmitted, 5 packets received, 0% packet loss

round-trip min/avg/max = 7.17/11.01/22.43 ms

# 查看Device A 上OSPF邻居信息，显示Device A和Device C已建立OSPF邻居关系。

[DeviceA] display ospf peer verbose

OSPF Process 1 with Router ID 2.2.2.2

Neighbors

Area 0.0.0.0 interface 10.1.0.101(Ten-GigabitEthernet3/1/1)'s neighbors

Router ID: 1.1.1.1 Address: 10.1.0.102 GR State: Normal

State: Full Mode: Nbr is Slave Priority: 1

DR: 10.1.0.101 BDR: 10.1.0.102 MTU: 0

Options is 0x42 (-|O|-|-|-|-|E|-)

Dead timer due in 39 sec

Neighbor is up for 00:09:01

Authentication Sequence: [ 0 ]

Neighbor state change count: 5

BFD status: Enabled(Control mode)

# BFD会话已被创建，且状态为UP。

[DeviceA] display bfd session verbose

Total session number: 1 Up session number: 1 Init mode: Active

IPv4 session working under Ctrl mode:

Local Discr: 10 Remote Discr: 1

Source IP: 10.1.0.101 Destination IP: 10.1.0.102

Session State: Up Interface: Ten-GigabitEthernet3/1/1

Min Trans Inter: 100ms Act Trans Inter: 100ms

Min Recv Inter: 100ms Act Detect Inter: 300ms

Rx Count: 3971 Tx Count: 3776

Connect Type: Direct Running Up for: 00:06:52

Hold Time: 300ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: OSPF

Diag Info: No Diagnostic

[DeviceC] display bfd session verbose

Total session number: 1 Up session number: 1 Init mode: Active

IPv4 session working under Ctrl mode:

Local Discr: 1 Remote Discr: 10

Source IP: 10.1.0.102 Destination IP: 10.1.0.101

Session State: Up Interface: Ten-GigabitEthernet3/1/1

Min Trans Inter: 100ms Act Trans Inter: 100ms

Min Recv Inter: 100ms Act Detect Inter: 300ms

Min Trans Inter: 100ms Act Trans Inter: 100ms

Min Recv Inter: 100ms Act Detect Inter: 100ms

Rx Count: 3 Tx Count: 3

Connect Type: Direct Running Up for: 00:06:52

Hold Time: 300ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: OSPF

Diag Info: No Diagnostic

# 在Device A上查看121.1.1.0/24的路由信息，可以看出Device A和Device C是通过L2 Switch进行通信的。

<DeviceA> display ip routing-table 121.1.1.0 verbose

Summary Count : 1

Destination: 120.1.1.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x1 Age: 04h20m37s

Cost: 1 Preference: 10

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x1008c OrigNextHop: 10.1.0.102

Label: NULL RealNextHop: 10.1.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: GigabitEthernet3/1/1

BkTunnel ID: Invalid BkInterface: N/A

# 当Device C和二层交换机之间的链路状态变为Down，BFD快速检测到链路发生变化立刻通告OSPF。

%Apr 2 11:34:26:880 2017 DeviceA BFD/5/BFD_CHANGE_FSM: Sess[10.1.0.101/10.1.0.102,1026/1026

,Ten-GigabitEthernet3/1/1,Ctrl] , Sta: UP-> DOWN, Diag: 5

%Apr 2 11:34:27:011 2017 DeviceA OSPF/5/OSPF_NBR_CHG: OSPF 1 Neighbor 10.1.0.102 Ten-GigabitEthernet3/1/1) from Full to Down.

# 查看121.1.1.0/24的路由信息，可以看出Device A和Device C已经切换到Device B进行通信。

<Device A> display ip routing-table 121.1.1.0 verbose

Summary Count : 1

Destination: 121.1.1.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x1 Age: 04h20m37s

Cost: 2 Preference: 10

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x1008c OrigNextHop: 192.168.0.102

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

5.6 配置文件

· Device A：

ospf 1

area 0.0.0.0

network 10.1.0.0 0.0.0.255

network 120.1.1.0 0.0.0.255

network 192.168.0.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.101 255.255.255.0

ospf bfd enable

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.0.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 120.1.1.1 255.255.255.0

· Device B：

ospf 1

area 0.0.0.0

network 13.1.1.0 0.0.0.255

network 192.168.0.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.0.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.101 255.255.255.0

· Device C：

ospf 1

area 0.0.0.0

network 10.1.0.0 0.0.0.255

network 13.1.1.0 0.0.0.255

network 121.1.1.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.102 255.255.255.0

ospf bfd enable

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.102 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 121.1.1.1 255.255.255.0

6 IS-IS与BFD联动配置举例

6.1 组网需求

如图6-1所示，某公司通过一台二层交换机作为中继将两个相距较远的部门连接。Device A、Device B、Device C上运行IS-IS，建立IS-IS邻居关系，保证网络层相互可达。

已知Device A和Device C都支持BFD功能，公司希望使用IS-IS与BFD联动技术，采用BFD控制报文方式实现当Device A或Device C与二层交换机之间的链路出现故障（如链路down）时，BFD能够快速感知并通告IS-IS协议。

现要求通过在Device A和Device C上配置IS-IS与BFD联动功能，实现：

· 监测通过L2 Switch通信的链路；

· 当链路出现故障时设备能够快速感知并通告IS-IS协议，快速切换到Device B链路进行通信。

图6-1 IS-IS与BFD联动配置组网图

设备	接口	IP地址	设备	接口	IP地址
Device A	XGE3/1/1	10.1.0.101/24	Device B	XGE3/1/1	192.168.0.102/24
	XGE3/1/2	192.168.0.101/24		XGE3/1/2	13.1.1.101/24
	XGE3/1/3	120.1.1.1/24
Device C	XGE3/1/1	10.1.0.102/24
	XGE3/1/2	13.1.1.102/24
	XGE3/1/3	121.1.1.1/24

6.2 配置思路

Device A和Device C都支持BFD，可以使用BFD控制报文方式，通信双方至少要有一方运行在主动模式才能成功建立起BFD会话。

6.3 使用版本

本举例是在R7607版本上进行配置和验证的。

6.4 配置步骤

6.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] ip address 10.1.0.101 24

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 请参考以上方法配置图6-1中其它接口的IP地址，配置步骤这里省略

6.4.2 配置IS-IS基本功能

(1) 配置Device A

# 配置Device A的IS-IS基本功能，并使能IS-IS的BFD功能。

[DeviceA] isis

[DeviceA-isis-1] network-entity 10.0000.0000.0001.00

[DeviceA-isis-1] quit

[DeviceA] interface ten-gigabitethernet 3/1/2

[DeviceA-Ten-GigabitEthernet3/1/2] isis enable

[DeviceA-Ten-GigabitEthernet3/1/2] quit

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] isis enable

[DeviceA-Ten-GigabitEthernet3/1/1] isis bfd enable

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 配置Device B

# 配置Device B的IS-IS基本功能。

[DeviceB] isis

[DeviceB-isis-1] network-entity 10.0000.0000.0003.00

[DeviceB-isis-1] quit

[DeviceB] interface ten-gigabitethernet 3/1/1

[DeviceB-Ten-GigabitEthernet3/1/1] isis enable

[DeviceB-Ten-GigabitEthernet1/1/1] quit

[DeviceB] interface ten-gigabitethernet 3/1/2

[DeviceB-Ten-GigabitEthernet3/1/2] isis enable

[DeviceB-Ten-GigabitEthernet3/1/2] quit

(3) 配置Device C

# 配置Device C的IS-IS基本功能，并使能IS-IS的BFD功能。

[DeviceC] isis

[DeviceC-isis-1] network-entity 10.0000.0000.0002.00

[DeviceC-isis-1] quit

[DeviceC] interface ten-gigabitethernet 3/1/1

[DeviceC-Ten-GigabitEthernet3/1/1] isis enable

[DeviceC-Ten-GigabitEthernet3/1/1] isis bfd enable

[DeviceC-Ten-GigabitEthernet3/1/1] quit

[DeviceC] interface ten-gigabitethernet 3/1/2

[DeviceC-Ten-GigabitEthernet3/1/2] isis enable

[DeviceC-Ten-GigabitEthernet3/1/2] quit

6.4.3 配置BFD功能

(1) 配置Device A

# 配置BFD会话建立前的运行模式为主动模式（缺省为主动模式）。

[DeviceA] bfd session init-mode active

# 配置发送和接收单跳BFD控制报文的最小时间间隔都为100ms，单跳BFD检测时间倍数为3。

[DeviceA] interface ten-gigabitethernet 3/1/1

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceA-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-Ten-GigabitEthernet3/1/1] quit

(2) 配置Device C

# 配置BFD会话建立前的运行模式为主动模式（缺省为主动模式）。

[DeviceC] bfd session init-mode active

# 配置发送和接收单跳BFD控制报文的最小时间间隔都为100ms，单跳BFD检测时间倍数为3。

[DeviceC] interface ten-gigabitethernet 3/1/1

[DeviceC-Ten-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceC-Ten-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceC-Ten-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceC-Ten-GigabitEthernet3/1/1] quit

6.5 验证配置

# 查看Device A上IS-IS邻居信息，显示Device A和Device C已建立IS-IS邻居关系。

[DeviceA] display isis peer verbose

Peer information for IS-IS(1)

-----------------------------

System ID: 0000.0000.0002

Interface: Ten-GigabitEthernet3/1/1 Circuit Id: 0000.0000.0002.01

State: Up HoldTime: 6s Type: L1(L1L2) PRI: 64

Area address(es): 00

Peer IP address(es): 10.1.0.102

Peer local circuit ID: 1

Peer circuit SNPA address: ce9d-d91d-d100

Uptime: 00:01:19

Adj protocol: IPv4

Graceful Restart capable

Restarting signal: No

Suppress adjacency advertisement: No

Local topology:

Remote topology:

# 查看Device A和Device C上BFD会话信息，显示BFD会话已被创建，且状态为Up。

[DeviceA] display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 2049 Remote Discr: 2049

Source IP: 10.1.0.101 Destination IP: 10.1.0.102

Session State: Up Interface: Ten-GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 3 Tx Count: 3

Connect Type: Direct Running Up for: 00:06:09

Hold Time: 300ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: ISIS_BR_L1/ISIS_BR_L2

Diag Info: No Diagnostic

[DeviceC] display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 2049 Remote Discr: 2049

Source IP: 10.1.0.102 Destination IP: 10.1.0.101

Session State: Up Interface: Ten-GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 3 Tx Count: 3

Connect Type: Direct Running Up for: 00:07:10

Hold Time: 300ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: ISIS_BR_L1/ISIS_BR_L2

Diag Info: No Diagnostic

# 在Device A上查看121.1.1.0/24的路由信息，可以看出Device A和Device C是通过L2 Switch进行通信的。

<DeviceA> display ip routing-table 121.1.1.0 verbose

Summary Count : 1

Destination: 121.1.1.0/24

Protocol: isis Process ID: 1

SubProtID: 0x1 Age: 04h20m37s

Cost: 20 Preference: 15

Tag: 0 State: Active Adv

OrigTblID: 0x2 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x1008c OrigNextHop: 10.1.0.102

Label: NULL RealNextHop: 10.1.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/1

BkTunnel ID: Invalid BkInterface: N/A

# 当Device C和二层交换机之间的链路Down了，BFD快速检测到链路发生变化并立刻通告IS-IS。

%Oct 9 16:11:24:163 2017 DeviceC BFD/5/BFD_CHANGE_FSM: -MDC=1; Sess[10.1.0.102/10.1.0.101, LD/RD:2049/2049, Interface: Ten-GigabitEthernet3/1/1, SessType:Ctrl, LinkType:INET] , S

ta: UP-> DOWN, Diag: 1

%Oct 9 16:11:24:164 2017 DeviceC ISIS/5/ISIS_NBR_CHG: -MDC=1; IS-IS 1, Level-1 adj

acency 0000.0000.0001 (Ten-GigabitEthernet3/1/1), state change to: DOWN.

%Oct 9 16:11:24:164 2017 DeviceC ISIS/5/ISIS_NBR_CHG: -MDC=1; IS-IS 1, Level-2 adj

acency 0000.0000.0001 (Ten-GigabitEthernet3/1/1), state change to: DOWN.

# 查看121.1.1.0/24的路由信息，可以看出Device A和Device C已经切换到Device B进行通信。

<Device A> display ip routing-table 121.1.1.0 verbose

Summary Count : 1

Destination: 121.1.1.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x1 Age: 04h20m37s

Cost: 21 Preference: 10

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NBRID: 0x26000002 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x1008c OrigNextHop: 192.168.0.102

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

6.6 配置文件

· Device A：

isis 1

network-entity 10.0000.0000.0001.00

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.101 255.255.255.0

isis enable 1

isis bfd enable

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.0.101 255.255.255.0

isis enable 1

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 120.1.1.1 255.255.255.0

· Device B：

isis 1

network-entity 10.0000.0000.0003.00

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.0.102 255.255.255.0

isis enable 1

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.101 255.255.255.0

isis enable 1

· Device C：

isis 1

network-entity 10.0000.0000.0002.00

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.102 255.255.255.0

isis enable 1

isis bfd enable

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.102 255.255.255.0

isis enable 1

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 121.1.1.1 255.255.255.0

7 BGP与BFD联动配置举例

7.1 组网需求

如图7-1所示，某公司的两个部门相距较远，Device A和Device F分别作为这两个部门的出口设备，现通过部署BGP，使两个部门可以进行业务通信。已知Device B和Device D都支持BFD功能，公司希望使用BGP与BFD联动技术，采用BFD控制报文方式检测AS 200与AS 300之间通信的主链路状态，实现当Device B或Device D之间的链路出现故障（如链路down）时，BFD能够快速感知并通告BGP协议。具体要求如下：

· 在AS 100内使用OSPF作为IGP；

· 配置Device B<－>Device C<－>Device D链路作为主链路，负责转发Device A和Device F之间的流量，并采用BFD控制报文的方式检测主链路；

· 当主链路发生故障时，BFD能够快速检测并通告BGP协议，使得迅速切换到Device B<－>Device E<－>Device D这条路径进行通信。

图7-1 BGP与BFD联动配置组网图

设备	接口	IP地址	设备	接口	IP地址
Device A	XGE3/1/1	120.1.0.1/24	Device D	XGE3/1/1	10.2.0.101/24
Device B	XGE3/1/1	10.1.0.101/24		XGE3/1/2	13.1.1.101/24
	XGE3/1/2	192.168.0.101/24		XGE3/1/3	120.2.0.2/24
	XGE3/1/3	120.1.0.2/24	Device E	XGE3/1/1	192.168.0.102/24
Device C	XGE3/1/1	10.1.0.102/24		XGE3/1/2	13.1.1.102/24
	XGE3/1/2	10.2.0.102/24	Device F	XGE3/1/1	120.2.0.1/24

7.2 配置思路

· Device B和Device D都支持BFD，可以使用BFD控制报文方式，通信双方至少要有一方运行在主动模式才能成功建立起BFD会话。

· 为了使Device B<－>Device C<－>Device D成为主链路，需要通过路由策略配置其路由开销低于链路Device B<－>Device E<－>Device D的路由开销。

7.3 使用版本

本举例是在R7607版本上进行配置和验证的。

7.4 配置步骤

7.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

<DeviceA> system-view

[DeviceA] interface ten-gigabitethernet 3/0/1

[DeviceA-Ten-GigabitEthernet3/0/1] undo shutdown

[DeviceA-Ten-GigabitEthernet3/0/1] ip address 120.1.0.1 24

[DeviceA-Ten-GigabitEthernet3/0/1] quit

请参考以上方法配置图7-1中其它接口的IP地址，配置步骤这里省略

7.4.2 在AS 100内配置OSPF功能，保证设备间路由可达

(1) 配置Device B

[DeviceB] ospf

[DeviceB-ospf-1] import-route direct

[DeviceB-ospf-1] area 0

[DeviceB-ospf-1-area-0.0.0.0] network 10.1.0.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] quit

[DeviceB-ospf-1] quit

(2) 配置Device C

[DeviceC] ospf

[DeviceC-ospf-1] area 0

[DeviceC-ospf-1-area-0.0.0.0] network 10.1.0.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 10.2.0.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] quit

[DeviceC-ospf-1] quit

(3) 配置Device D

[DeviceD] ospf

[DeviceD-ospf-1] import-route direct

[DeviceD-ospf-1] area 0

[DeviceD-ospf-1-area-0.0.0.0] network 10.2.0.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] quit

[DeviceD-ospf-1] quit

(4) 配置Device E

[DeviceE] ospf

[DeviceE-ospf-1] area 0

[DeviceE-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255

[DeviceE-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255

[DeviceE-ospf-1-area-0.0.0.0] quit

[DeviceE-ospf-1] quit

7.4.3 配置BGP功能

(1) 配置Device A

# 启动BGP，指定本地AS号为200。

[DeviceA] bgp 200

[DeviceA-bgp] router id 1.1.1.1

# 配置Device A和Device B建立EBGP连接。

[DeviceA-bgp] peer 120.1.0.2 as-number 100

# 创建BGP IPv4单播地址族，并进入BGP IPv4单播地址族视图。

[DeviceA-bgp] address-family ipv4 unicast

# 在BGP IPv4单播地址族视图下，将本地路由表中到达120.1.0.0/24网段的路由添加到BGP路由表中。

[DeviceA-bgp-ipv4] network 120.1.0.0 255.255.255.0

# 使能Device A与对等体120.1.0.2交换IPv4单播路由信息的能力。

[DeviceA-bgp-ipv4] peer 120.1.0.2 enable

[DeviceA-bgp-ipv4] quit

(2) 配置Device B

# 启动BGP，指定本地AS号为100。

[DeviceB] bgp 100

[DeviceB-bgp] router id 2.2.2.2

# 配置Device B和Device A建立EBGP连接。

[DeviceB-bgp] peer 120.1.0.1 as-number 200

# 配置Device B和Device D建立IBGP连接。

[DeviceB-bgp] peer 10.2.0.101 as-number 100

[DeviceB-bgp] peer 13.1.1.101 as-number 100

# 创建BGP IPv4单播地址族，并进入BGP IPv4单播地址族视图。

[DeviceB-bgp] address-family ipv4 unicast

# 使能Device B与对等体10.2.0.101交换IPv4单播路由信息的能力。

[DeviceB-bgp-ipv4] peer 10.2.0.101 enable

# 在BGP IPv4单播地址族视图下，配置向对等体10.2.0.101发布BGP路由时，将下一跳属性修改为自身的地址。

[DeviceB-bgp-ipv4] peer 10.2.0.101 next-hop-local

# 使能Device B与对等体13.1.1.101交换IPv4单播路由信息的能力。

[DeviceB-bgp-ipv4] peer 13.1.1.101 enable

# 在BGP IPv4单播地址族视图下，配置向对等体13.1.1.101发布BGP路由时，将下一跳属性修改为自身的地址。

[DeviceB-bgp-ipv4] peer 13.1.1.101 next-hop-local

# 使能Device B与对等体120.1.0.1交换IPv4单播路由信息的能力。

[DeviceB-bgp-ipv4] peer 120.1.0.1 enable

[DeviceB-bgp-ipv4] quit

(3) 配置Device D

# 启动BGP，指定本地AS号为100。

[DeviceD] bgp 100

[DeviceD-bgp] router id 4.4.4.4

# 配置Device D和Device B建立IBGP连接。

[DeviceD-bgp] peer 10.1.0.101 as-number 100

[DeviceD-bgp] peer 192.168.0.101 as-number 100

# 配置Device D和Device F建立EBGP连接。

[DeviceD-bgp] peer 120.2.0.1 as-number 300

# 创建BGP IPv4单播地址族，并进入BGP IPv4单播地址族视图。

[DeviceD-bgp] address-family ipv4 unicast

# 使能Device D与对等体10.1.0.101交换IPv4单播路由信息的能力。

[DeviceD-bgp-ipv4] peer 10.1.0.101 enable

# 在BGP IPv4单播地址族视图下，配置向对等体10.1.0.101发布BGP路由时，将下一跳属性修改为自身的地址。

[DeviceD-bgp-ipv4] peer 10.1.0.101 next-hop-local

# 使能Device D与对等体192.168.0.101交换IPv4单播路由信息的能力。

[DeviceD-bgp-ipv4] peer 192.168.0.101 enable

# 在BGP IPv4单播地址族视图下，配置向对等体192.168.0.101发布BGP路由时，将下一跳属性修改为自身的地址。

[DeviceD-bgp-ipv4] peer 192.168.0.101 next-hop-local

# 使能Device D与对等体120.2.0.1交换IPv4单播路由信息的能力。

[DeviceD-bgp-ipv4] peer 120.2.0.1 enable

[DeviceD-bgp-ipv4] quit

(4) 配置Device F

#启动BGP，指定本地AS号为300。

[DeviceF] bgp 300

[DeviceF-bgp] router id 6.6.6.6

# 配置Device F和Device D建立EBGP连接。

[DeviceF-bgp] peer 120.2.0.2 as-number 100

# 创建BGP IPv4单播地址族，并进入BGP IPv4单播地址族视图。

[DeviceF-bgp] address-family ipv4 unicast

# 在BGP IPv4单播地址族视图下，将本地路由表中到达120.2.0.0/24网段的路由添加到BGP路由表中。

[DeviceF-bgp-ipv4] network 120.2.0.0 255.255.255.0

# 使能Device F与对等体120.2.0.2交换IPv4单播路由信息的能力。

[DeviceF-bgp-ipv4] peer 120.2.0.2 enable

[DeviceF-bgp-ipv4] quit

7.4.4 配置路由策略

(1) 配置Device B

# 创建ACL 2000，允许源IP地址为120.1.0.0/24的报文通过。

[DeviceB] acl basic 2000

[DeviceB-acl-ipv4-basic-2000] rule permit source 120.1.0.0 0.0.0.255

[DeviceB-acl-ipv4-basic-2000] quit

# 配置向对等体10.2.0.101发布的路由设置本地优先级为200，并配置IBGP路由优先级为100。

[DeviceB] route-policy local-pre permit node 10

[DeviceB-route-policy-local-pre] if-match ip address acl 2000

[DeviceB-route-policy-local-pre] apply local-preference 200

[DeviceB-route-policy-local-pre] quit

[DeviceB] bgp 100

[DeviceB-bgp] address-family ipv4 unicast

[DeviceB-bgp-ipv4] peer 10.2.0.101 route-policy local-pre export

[DeviceB-bgp-ipv4] preference 255 100 130

[DeviceB-bgp-ipv4] quit

(2) 配置Device D

# 创建ACL 2000，允许源IP地址为120.2.0.0/24的报文通过。

[DeviceD] acl basic 2000

[DeviceD-acl-ipv4-basic-2000] rule permit source 120.2.0.0 0.0.0.255

[DeviceD-acl-ipv4-basic-2000] quit

# 配置向对等体10.1.0.101发布的路由设置本地优先级为200，并配置IBGP路由优先级为100。

[DeviceD] route-policy local-pre permit node 10

[DeviceD-route-policy-local-pre] if-match ip address acl 2000

[DeviceD-route-policy-local-pre] apply local-preference 200

[DeviceD-route-policy-local-pre] quit

[DeviceD] bgp 100

[DeviceD-bgp] address-family ipv4 unicast

[DeviceD-bgp-ipv4] peer 10.1.0.101 route-policy local-pre export

[DeviceD-bgp-ipv4] preference 255 100 130

[DeviceD-bgp-ipv4] quit

7.4.5 配置BFD功能

(1) 配置Device B

[DeviceB] bgp 100

[DeviceB-bgp] peer 10.2.0.101 bfd

[DeviceB-bgp] quit

(2) 配置Device D

[DeviceD] bgp 100

[DeviceD-bgp] peer 10.1.0.101 bfd

[DeviceD-bgp] quit

7.5 验证配置

# 从Device A上ping Device F的IP地址，可以互通。

[DeviceA] ping 120.2.0.1

Ping 120.2.0.1 (120.2.0.1): 56 data bytes, press CTRL_C to break

56 bytes from 120.2.0.1: icmp_seq=0 ttl=252 time=1.189 ms

56 bytes from 120.2.0.1: icmp_seq=1 ttl=252 time=1.095 ms

56 bytes from 120.2.0.1: icmp_seq=2 ttl=252 time=1.086 ms

56 bytes from 120.2.0.1: icmp_seq=3 ttl=252 time=1.097 ms

56 bytes from 120.2.0.1: icmp_seq=4 ttl=252 time=1.089 ms

--- Ping statistics for 120.2.0.1 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 1.086/1.111/1.189/0.039 ms

# 在Device B上通过命令display bgp peer查看BGP对等体信息，可以看到Device B与Device D建立IBGP连接，Device B与Device A建立EBGP连接，且均处于Established状态。

[DeviceB] display bgp peer ipv4

BGP local router ID: 2.2.2.2

Local AS number: 100

Total number of peers: 3 Peers in established state: 3

Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State

10.2.0.101 100 6 4 0 1 00:00:56 Established

13.1.1.101 100 6 5 0 1 00:00:56 Established

120.1.0.1 200 6 5 0 1 00:00:56 Established

# 查看Device B上BFD会话信息，显示BFD会话已被创建，且状态为Up。

[DeviceB] display bfd session verbose

Total Session Num: 1 Up Session Num: 0 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 2049 Remote Discr: 0

Source IP: 10.1.0.101 Destination IP: 10.2.0.101

Session State: UP Interface: N/A

Min Tx Inter: 1000ms Act Tx Inter: 1000ms

Min Rx Inter: 1000ms Detect Inter: 5000ms

Rx Count: 0 Tx Count: 910

Connect Type: Indirect Running Up for: 00:00:00

Hold Time: 0ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: BGP

Diag Info: No Diagnostic

# 在Device B上查看120.2.0.0/24的路由信息，可以看出Device B通过Device B<－>Device C<－>Device D这条路径与120.2.0.0/24网段通信。

[DeviceB] display ip routing-table 120.2.0.0 24 verbose

Summary Count : 3

Destination: 120.2.0.0/24

Protocol: BGP Process ID: 0

SubProtID: 0x1 Age: 00h24m48s

Cost: 0 Preference: 100

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 300

NibID: 0x15000001 LastAs: 300

AttrID: 0x1 Neighbor: 10.2.0.101

Flags: 0x10060 OrigNextHop: 10.2.0.101

Label: NULL RealNextHop: 10.1.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/1

BkTunnel ID: Invalid BkInterface: N/A

Destination: 120.2.0.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x8 Age: 00h26m19s

Cost: 1 Preference: 150

Tag: 1 State: Inactive Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NibID: 0x13000005 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x41 OrigNextHop: 10.1.0.102

Label: NULL RealNextHop: 10.1.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/1

BkTunnel ID: Invalid BkInterface: N/A

Destination: 120.2.0.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x8 Age: 00h26m19s

Cost: 1 Preference: 150

Tag: 1 State: Inactive Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NibID: 0x13000003 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x41 OrigNextHop: 192.168.0.102

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

# 在Device B<－>Device C<－>Device D链路发生故障后，从Device A上ping Device F的IP地址，可以互通。

<DeviceA> ping 120.2.0.1

Ping 120.1.0.1 (120.2.0.1): 56 data bytes, press CTRL_C to break

56 bytes from 120.2.0.1: icmp_seq=0 ttl=252 time=0.680 ms

56 bytes from 120.2.0.1: icmp_seq=1 ttl=252 time=0.295 ms

56 bytes from 120.2.0.1: icmp_seq=2 ttl=252 time=0.423 ms

56 bytes from 120.2.0.1: icmp_seq=3 ttl=252 time=0.464 ms

56 bytes from 120.2.0.1: icmp_seq=4 ttl=252 time=0.445 ms

--- Ping statistics for 120.2.0.1 ---

5 packets transmitted, 5 packets received, 0.0% packet loss

round-trip min/avg/max/std-dev = 0.295/0.461/0.680/0.124 ms

# 在Device B上查看120.2.0.0/24的路由信息，可以看出Device B通过Device B<－>Device E<－>Device D这条路径与120.2.0.0/24网段通信。

<DeviceB> display ip routing-table 120.2.0.0 24 verbose

Summary Count : 2

Destination: 120.2.0.0/24

Protocol: BGP Process ID: 0

SubProtID: 0x1 Age: 00h00m18s

Cost: 0 Preference: 100

Tag: 0 State: Active Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 300

NibID: 0x15000001 LastAs: 300

AttrID: 0x1 Neighbor: 10.2.0.101

Flags: 0x10060 OrigNextHop: 10.2.0.101

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

Destination: 120.2.0.0/24

Protocol: OSPF Process ID: 1

SubProtID: 0x8 Age: 00h00m18s

Cost: 1 Preference: 150

Tag: 1 State: Inactive Adv

OrigTblID: 0x0 OrigVrf: default-vrf

TableID: 0x2 OrigAs: 0

NibID: 0x13000001 LastAs: 0

AttrID: 0xffffffff Neighbor: 0.0.0.0

Flags: 0x41 OrigNextHop: 192.168.0.102

Label: NULL RealNextHop: 192.168.0.102

BkLabel: NULL BkNextHop: N/A

Tunnel ID: Invalid Interface: Ten-GigabitEthernet3/1/2

BkTunnel ID: Invalid BkInterface: N/A

7.6 配置文件

· Device A：

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 120.1.0.1 255.255.255.0

bgp 200

router id 1.1.1.1

peer 120.1.0.2 as-number 200

address-family ipv4 unicast

network 120.1.0.0 255.255.255.0

peer 120.1.0.2 enable

· Device B：

ospf 1

import-route direct

area 0.0.0.0

network 10.1.0.0 0.0.0.255

network 192.168.0.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.101 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 192.168.0.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 120.1.0.2 255.255.255.0

bgp 100

router id 2.2.2.2

peer 10.2.0.101 as-number 100

peer 10.2.0.101 bfd

peer 13.1.1.101 as-number 100

peer 120.1.0.1 as-number 200

address-family ipv4 unicast

preference 255 100 130

peer 10.2.0.101 enable

peer 10.2.0.101 next-hop-local

peer 10.2.0.101 route-policy local-pre export

peer 13.1.1.101 enable

peer 13.1.1.101 next-hop-local

peer 120.1.0.1 enable

route-policy local-pre permit node 10

if-match ip address acl 2000

apply local-preference 200

acl basic 2000

rule 0 permit source 120.1.0.0 0.0.0.255

· Device C：

ospf 1

area 0.0.0.0

network 10.1.0.0 0.0.0.255

network 10.2.0.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.1.0.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 10.2.0.102 255.255.255.0

· Device D

ospf 1

import-route direct

area 0.0.0.0

network 10.2.0.0 0.0.0.255

network 13.1.1.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 10.2.0.101 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.101 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 120.1.0.2 255.255.255.0

bgp 100

router id 4.4.4.4

peer 10.1.0.101 as-number 100

peer 10.1.0.101 bfd

peer 120.2.0.1 as-number 300

peer 192.168.0.101 as-number 100

address-family ipv4 unicast

preference 255 100 130

peer 10.1.0.101 enable

peer 10.1.0.101 next-hop-local

peer 10.1.0.101 route-policy local-pre export

peer 192.168.0.101 enable

peer 192.168.0.101 next-hop-local

peer 120.2.0.1 enable

acl basic 2000

rule 0 permit source 120.2.0.0 0.0.0.255

· Device E：

ospf 1

area 0.0.0.0

network 13.1.1.0 0.0.0.255

network 192.168.0.0 0.0.0.255

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 192.168.0.102 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 13.1.1.102 255.255.255.0

· Device F：

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 120.2.0.1 255.255.255.0

bgp 300

router id 6.6.6.6

peer 120.2.0.2 as-number 100

address-family ipv4 unicast

network 120.2.0.0 255.255.255.0

peer 120.2.0.2 enable

8 策略路由与BFD联动配置举例

8.1 组网需求

某公司内部网络如图8-1所示，从Device A到Device C有两条转发路径：Link A和Link B。下一跳分别为Device B和Device C。Link A为直连链路，Link B为非直连链路。已知Device C不支持BFD功能，公司希望使用策略路由与BFD联动技术，实现源IP为40.0.0.2的报文优先选择Link B，当Device A和Device B的链路出现故障（如链路down）时，Device A能快速感知，并将流量切换到Link A的链路上。

图8-1 策略路由与BFD联动配置组网图

8.2 配置思路

· 由于需要两端设备均支持BFD，才能够使用控制报文方式，本例中Device C不支持BFD，在Device A上配置的BFD功能仅能使用echo报文方式。

8.3 使用版本

本举例是在R7607版本上进行配置和验证的。

8.4 配置步骤

8.4.1 配置各接口的IP地址

(1) 配置Device A各接口的IP地址

<DeviceA> system-view

[DeviceA] interface Ten-GigabitEthernet 3/1/2

[DeviceA-Ten-GigabitEthernet3/1/2] ip address 40.0.0.1 24

[DeviceA-Ten-GigabitEthernet3/1/2] quit

(2) 请参考以上方法配置图8-1中其它接口的IP地址，配置步骤这里省略

8.4.2 配置静态路由

(1) 配置Device A

# 配置Device A到Device C 50.0.0.0网段的静态路由。

[DeviceA] ip route-static 50.0.0.0 24 ten-gigabitEthernet 3/1/1 13.13.13.2

(2) 配置Device B

# 配置Device B到Device C 50.0.0.0网段的静态路由。

[DeviceB] ip route-static 50.0.0.0 24 ten-gigabitEthernet 3/1/2 24.24.24.4

8.4.3 配置Device A上的路由策略

# 配置匹配源IP地址为40.0.0.2的IP报文的ACL规则。

[DeviceA] acl advanced 3010

[DeviceA-acl-ipv4-adv-3010] rule 0 permit ip source 40.0.0.2 0

[DeviceA-acl-ipv4-adv-3010] quit

# 配置策略路由aaa，使满足ACL规则报文的下一跳为12.12.12.2，并与track 11绑定。

[DeviceA] policy-based-route aaa permit node 5

[DeviceA-pbr-aaa-5] if-match acl 3010

[DeviceA-pbr-aaa-5] apply next-hop 12.12.12.2 track 11

[DeviceA-pbr-aaa-5] quit

# 在接口上应用路由策略aaa。

[DeviceA] interface ten-gigabitEthernet 3/1/2

[DeviceA-Ten-GigabitEthernet3/1/2] ip policy-based-route aaa

[DeviceA-Ten-GigabitEthernet3/1/2] quit

8.4.4 配置BFD功能，并创建和BFD会话关联的Track项11，检测Device B是否可达

(1) 配置Device A

# 策略路由支持的BFD会话方式为echo报文方式，该方式下必须配置BFD echo报文的源IP地址。IP地址可以任意指定，不需要与实际接口地址对应。建议不要将BFD echo报文的源IP地址配置为属于该设备任何一个接口所在网段。

[DeviceA] bfd echo-source-ip 3.3.3.3

# 配置发送和接收单跳BFD控制报文的最小时间间隔都为100ms，单跳BFD检测时间倍数为3。

[DeviceA] interface ten-gigabitEthernet 3/1/3

[DeviceA-Ten-GigabitEthernet3/1/3] bfd min-echo-receive-interval 100

[DeviceA-Ten-GigabitEthernet3/1/3] bfd detect-multiplier 3

[DeviceA-Ten-GigabitEthernet3/1/3] quit

[DeviceA] track 11 bfd echo interface ten-GigabitEthernet 3/1/3 remote ip 12.12.12.2 local ip 12.12.12.1

8.5 验证配置

# 查看Device A上源地址为40.0.0.0网段的流量，可以看到该网段当前流量优先从Ten-GigabitEthernet3/1/3接口（即Link B）转发出去。

<DeviceA> reset counters interface

<DeviceA> display counters outbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

XGE3/1/1 0 0 0 0

XGE3/1/2 0 0 0 0

XGE3/1/3 585414 0 0 0

XGE3/1/4 0 0 0 0

XGE3/1/5 0 0 0 0

XGE3/1/6 0 0 0 0

# 查看BFD会话信息，显示BFD会话已被创建，且状态为Up。

[DeviceA] display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Echo Mode:

Local Discr: 2049

Source IP: 12.12.12.1 Destination IP: 12.12.12.2

Session State: Up Interface: Ten-GigabitEthernet3/1/3

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 128234 Tx Count: 371950

Connect Type: Direct Running Up for: 00:01:04

Detect Mode: Async Chassis/Slot: 1/0

Protocol: TRACK

Diag Info: No Diagnostic

# 当Device A和Device B间链路故障后，BFD会话Down。

%Dec 10 16:39:46:210 2017 DeviceA BFD/5/BFD_CHANGE_FSM: -MDC=1; Sess[12.12.12.1/

12.12.12.2, LD/RD:2049/2049, Interface: Ten-GigabitEthernet3/1/3, SessType:Echo, LinkType:INET] , S

ta: UP-> DOWN, Diag: 1

%Dec 10 16:39:47:342 2017 DeviceA IFNET/3/PHY_UPDOWN: -MDC=1; Ten-GigabitEtherne

T3/1/3 link status is down.

%Dec 10 16:39:47:343 2017 DeviceA IFNET/5/LINK_UPDOWN: -MDC=1; Line protocol on

the interface Ten-GigabitEthernet3/1/3 is down.

%Dec 10 16:39:47:343 2017 DeviceA IFNET/3/PHY_UPDOWN: -MDC=1; Ten-GigabitEthernet3/1/3

link status is down.

# 清除流量后重新查看Device A上源地址为40.0.0.0网段的流量，可以看到当前流量从Ten-GigabitEthernet3/1/1接口（即Link A）转发出去。

<DeviceA> reset counters interface

<DeviceA> display counters outbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

XGE3/1/1 863764 0 0 0

XGE3/1/2 0 0 0 0

XGE3/1/3 0 0 0 0

XGE3/1/4 0 0 0 0

XGE3/1/5 0 0 0 0

XGE3/1/6 0 0 0 0

8.6 配置文件

· Device A

bfd echo-source-ip 3.3.3.3

policy-based-route aaa permit node 5

if-match acl 3010

apply next-hop 12.12.12.2 track 11

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 13.13.13.1 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 40.0.0.1 255.255.255.0

ip policy-based-route aaa

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 12.12.12.1 255.255.255.0

bfd min-echo-receive-interval 10

bfd detect-multiplier 3

ip route-static 50.0.0.0 24 Ten-GigabitEthernet3/1/1 13.13.13.2

ip local policy-based-route aaa

acl advanced 3010

rule 0 permit ip source 40.0.0.2 0

track 11 bfd echo interface Ten-GigabitEthernet3/1/3 remote ip 12.12.12.2 local ip 12.

12.12.1

· Device B

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 12.12.12.2 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 24.24.24.2 255.255.255.0

ip route-static 50.0.0.0 24 Ten-GigabitEthernet3/1/2 24.24.24.4

· Device C

interface Ten-GigabitEthernet3/1/1

port link-mode route

ip address 13.13.13.2 255.255.255.0

interface Ten-GigabitEthernet3/1/2

port link-mode route

ip address 50.0.0.1 255.255.255.0

interface Ten-GigabitEthernet3/1/3

port link-mode route

ip address 24.24.24.4 255.255.255.0

9 BFD单跳检测三层链路配置举例

9.1 组网需求

如图9-1所示，Device A和Device B通过三层以太网接口GigabitEthernet3/1/1相互连接。

现要求实现以下需求：在Device A和Device B上配置BFD检测三层接口功能，当Device A与Device B之间出现故障时，BFD能够快速发现并将接口置为Down状态，使上层协议快速感知，确保数据流量不再从该三层接口上转发。

图9-1 BFD单跳检测三层链路配置组网图

9.2 使用版本

本举例是在R7607版本上进行配置和验证的。

9.3 配置步骤

9.3.1 配置Device A

# Device A各接口的IP地址。

<DeviceA> system-view

[DeviceA] interface gigabitethernet 3/1/1

[DeviceA-GigabitEthernet3/1/1] ip address 10.1.1.1 24

[DeviceA-GigabitEthernet3/1/1] quit

# 配置BFD。

[DeviceA] bfd session init-mode active

[DeviceA] interface gigabitethernet 3/1/1

[DeviceA-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceA-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceA-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-GigabitEthernet3/1/1] bfd detect-interface source-ip 10.1.1.1

[DeviceA-GigabitEthernet3/1/1] quit

9.3.2 配置Device B

# Device B各接口的IP地址。

<DeviceB> system-view

[DeviceB] interface gigabitethernet 3/1/1

[DeviceB-GigabitEthernet3/1/1] ip address 10.1.1.2 24

[DeviceB-GigabitEthernet3/1/1] quit

# 配置BFD。

[DeviceB] bfd session init-mode active

[DeviceB] interface gigabitethernet 3/1/1

[DeviceB-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceB-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceB-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceB-GigabitEthernet3/1/1] bfd detect-interface source-ip 10.1.1.2

[DeviceB-GigabitEthernet3/1/1] quit

9.4 验证配置

(1) Device A和Device B设备及之间的链路均正常工作时

# 查看Device A的BFD会话。

<DeviceA> display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1537 Remote Discr: 1537

Source IP: 10.1.1.1 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 280 Tx Count: 367

Connect Type: Direct Running Up for: 00:00:28

Hold Time: 276ms Auth mode: None

Detect Mode: Async Slot: 1

Protocol: Interface

Diag Info: No Diagnostic

# 查看Device B的BFD会话。

<DeviceB> display bfd session verbose

Total Session Num: 1 Up Session Num: 1 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1537 Remote Discr: 1537

Source IP: 10.1.1.2 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 143 Tx Count: 145

Connect Type: Direct Running Up for: 00:00:14

Hold Time: 251ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

以上显示信息表示Device A和Device B用BFD协议检测本设备GigabitEthernet3/1/1接口及链路状态，报文目的地址固定为224.0.0.184。

(2) Device A的GigabitEthernet3/1/1或Device A与Device B之间的链路Down时

<DeviceB> %Dec 19 11:25:47:528 2017 DeviceB BFD/5/BFD_CHANG

E_FSM: -MDC=1; Sess[10.1.1.2/224.0.0.184, LD/RD:1540/1540, Interface:GE3/1/1, Se

ssType:Ctrl, LinkType:INET], Sta: UP->DOWN, Diag: 1

%Dec 19 11:25:47:530 2017 DeviceB IFNET/5/LINK_UPDOWN: -MDC=1; Line protocol on

the interface GigabitEthernet3/1/1 is down.

%Dec 19 11:25:49:162 2017 DeviceB IFNET/3/PHY_UPDOWN: -MDC=1; GigabitEthernet3/0

/1 link status is down.

# 查看Device B的BFD会话。

<DeviceB> display bfd session verbose

Total Session Num: 1 Up Session Num: 0 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1537 Remote Discr: 0

Source IP: 10.1.1.2 Destination IP: 224.0.0.184

Session State: Down Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 3123 Tx Count: 3133

Connect Type: Direct Running Up for: 00:00:00

Hold Time: 0ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: Control Detection Time Expired

以上显示信息表示当Device B上BFD协议监视的端口或与此端口相连的链路down时，立即将BFD状态置为Down，并通知端口模块将端口的链路层状态置为Down，以便上层协议及时发现，不再将流量从此接口上通过。

9.5 配置文件

· Device A：

bfd session init-mode active

interface GigabitEthernet3/1/1

port link-mode route

ip address 10.1.1.1 255.255.255.0

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 10.1.1.1

· Device B：

bfd session init-mode active

interface GigabitEthernet3/1/1

port link-mode route

ip address 10.1.1.2 255.255.255.0

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 10.1.1.2

10 BFD检测三层静态聚合组配置举例

10.1 组网需求

如图10-1所示，Device A和Device B通过三层以太网接口GigabitEthernet3/1/1~GigabitEthernet3/1/3相互连接。

现要求实现以下需求：

· 在Device A和Device B上分别配置三层静态链路聚合组，将这些接口加入聚合组。

· 在静态链路聚合组的每个成员接口上分别配置BFD功能，当成员接口或成员链路出现故障（如链路Down）时，BFD能够快速发现并知会三层静态链路聚合组，使聚合组的数据流量不再从该成员接口上转发。

图10-1 BFD检测三层静态聚合组成员接口配置组网图

10.2 使用版本

本举例是在R7607版本上进行配置和验证的。

10.3 配置注意事项

· 聚合链路的两端应配置相同的聚合模式。

· 配置了下列功能的端口将不能加入三层聚合组：AC与交叉连接关联（请参见“MPLS配置指导”中的“MPLS L2VPN”）以及AC与VSI关联（请参见“MPLS配置指导”中的“VPLS”）。

10.4 配置步骤

10.4.1 配置Device A

# 创建三层聚合接口1，并为该接口配置IP地址和子网掩码。

<DeviceA> system-view

[DeviceA] interface route-aggregation 1

[DeviceA-Route-Aggregation1] ip address 192.168.1.1 24

[DeviceA-Route-Aggregation1] quit

# 分别将接口GigabitEthernet3/1/1至GigabitEthernet3/1/3加入到聚合组1中。

[DeviceA] interface gigabitethernet 3/1/1

[DeviceA-GigabitEthernet3/1/1] port link-aggregation group 1

[DeviceA-GigabitEthernet3/1/1] quit

[DeviceA] interface gigabitethernet 3/1/2

[DeviceA-GigabitEthernet3/1/2] port link-aggregation group 1

[DeviceA-GigabitEthernet3/1/2] quit

[DeviceA] interface gigabitethernet 3/1/3

[DeviceA-GigabitEthernet3/1/3] port link-aggregation group 1

[DeviceA-GigabitEthernet3/1/3] quit

# 配置BFD。

[DeviceA] bfd session init-mode active

[DeviceA] interface gigabitethernet 3/1/1

[DeviceA-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceA-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceA-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceA-GigabitEthernet3/1/1] bfd detect-interface source-ip 1.1.1.1

[DeviceA-GigabitEthernet3/1/1] quit

[DeviceA] interface gigabitethernet 3/1/2

[DeviceA-GigabitEthernet3/1/2] bfd min-transmit-interval 100

[DeviceA-GigabitEthernet3/1/2] bfd min-receive-interval 100

[DeviceA-GigabitEthernet3/1/2] bfd detect-multiplier 3

[DeviceA-GigabitEthernet3/1/2] bfd detect-interface source-ip 1.1.1.2

[DeviceA-GigabitEthernet3/1/2] quit

[DeviceA] interface gigabitethernet 3/1/3

[DeviceA-GigabitEthernet3/1/3] bfd min-transmit-interval 100

[DeviceA-GigabitEthernet3/1/3] bfd min-receive-interval 100

[DeviceA-GigabitEthernet3/1/3] bfd detect-multiplier 3

[DeviceA-GigabitEthernet3/1/3] bfd detect-interface source-ip 1.1.1.3

[DeviceA-GigabitEthernet3/1/3] quit

10.4.2 配置Device B

# 创建三层聚合接口1，并为该接口配置IP地址和子网掩码。

<DeviceB> system-view

[DeviceB] interface route-aggregation 1

[DeviceB-Route-Aggregation1] ip address 192.168.1.2 24

[DeviceB-Route-Aggregation1] quit

# 分别将接口GigabitEthernet3/1/1至GigabitEthernet3/1/3加入到聚合组1中。

[DeviceB] interface gigabitethernet 3/1/1

[DeviceB-GigabitEthernet3/1/1] port link-aggregation group 1

[DeviceB-GigabitEthernet3/1/1] quit

[DeviceB] interface gigabitethernet 3/1/2

[DeviceB-GigabitEthernet3/1/2] port link-aggregation group 1

[DeviceB-GigabitEthernet3/1/2] quit

[DeviceB] interface gigabitethernet 3/1/3

[DeviceB-GigabitEthernet3/1/3] port link-aggregation group 1

[DeviceB-GigabitEthernet3/1/3] quit

# 配置BFD。

[DeviceB] bfd session init-mode active

[DeviceB] interface gigabitethernet 3/1/1

[DeviceB-GigabitEthernet3/1/1] bfd min-transmit-interval 100

[DeviceB-GigabitEthernet3/1/1] bfd min-receive-interval 100

[DeviceB-GigabitEthernet3/1/1] bfd detect-multiplier 3

[DeviceB-GigabitEthernet3/1/1] bfd detect-interface source-ip 2.1.1.1

[DeviceB-GigabitEthernet3/1/1] quit

[DeviceB] interface gigabitethernet 3/1/2

[DeviceB-GigabitEthernet3/1/2] bfd min-transmit-interval 100

[DeviceB-GigabitEthernet3/1/2] bfd min-receive-interval 100

[DeviceB-GigabitEthernet3/1/2] bfd detect-multiplier 3

[DeviceB-GigabitEthernet3/1/2] bfd detect-interface source-ip 2.1.1.2

[DeviceB-GigabitEthernet3/1/2] quit

[DeviceB] interface gigabitethernet 3/1/3

[DeviceB-GigabitEthernet3/1/3] bfd min-transmit-interval 100

[DeviceB-GigabitEthernet3/1/3] bfd min-receive-interval 100

[DeviceB-GigabitEthernet3/1/3] bfd detect-multiplier 3

[DeviceB-GigabitEthernet3/1/3] bfd detect-interface source-ip 2.1.1.3

[DeviceB-GigabitEthernet3/1/3] quit

10.5 验证配置

(1) Device A和Device B设备及之间的链路均正常工作时

# 查看Device A的BFD会话。

<DeviceA> display bfd session verbose

Total Session Num: 3 Up Session Num: 3 Init Mode: Passive

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1538 Remote Discr: 1538

Source IP: 1.1.1.3 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/3

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 892 Tx Count: 890

Connect Type: Direct Running Up for: 00:01:29

Hold Time: 299ms Auth mode: None

Detect Mode: Async Slot: 1

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1539 Remote Discr: 1539

Source IP: 1.1.1.2 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/2

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 599 Tx Count: 598

Connect Type: Direct Running Up for: 00:01:00

Hold Time: 290ms Auth mode: None

Detect Mode: Async Slot: 1

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1540 Remote Discr: 1540

Source IP: 1.1.1.1 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 443 Tx Count: 442

Connect Type: Direct Running Up for: 00:00:44

Hold Time: 282ms Auth mode: None

Detect Mode: Async Slot: 1

Protocol: Interface

Diag Info: No Diagnostic

# 查看Device B的BFD会话。

<DeviceB> display bfd session verbose

Total Session Num: 3 Up Session Num: 3 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1538 Remote Discr: 1538

Source IP: 2.1.1.3 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/3

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 2626 Tx Count: 2829

Connect Type: Direct Running Up for: 00:04:22

Hold Time: 297ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1539 Remote Discr: 1539

Source IP: 2.1.1.2 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/2

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 2333 Tx Count: 2543

Connect Type: Direct Running Up for: 00:03:53

Hold Time: 296ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1540 Remote Discr: 1540

Source IP: 2.1.1.1 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 2786 Tx Count: 2789

Connect Type: Direct Running Up for: 00:03:37

Hold Time: 297ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

以上显示信息表示Device A和Device B用BFD协议检测本设备GigabitEthernet3/1/1、GigabitEthernet3/1/2和GigabitEthernet3/1/3接口及链路状态，报文目的地址固定为224.0.0.184。

# 查看Device A接口上的数据流量。

<DeviceA> display counters inbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

GE3/1/1 12691 21 12398 0

GE3/1/2 11551 0 11551 0

GE3/1/3 11837 0 11837 0

# 查看Device B接口上的数据流量。

<DeviceB> display counters inbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

GE3/1/1 11330 16 11028 0

GE3/1/2 10386 0 10386 0

GE3/1/3 10853 0 10853 0

以上显示信息表示Device A和Device B上静态聚合组1中各端口都能正常转发流量。

# 查看Device B上所有聚合组的详细信息。

<DeviceB>display link-aggregation verbose

Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing

Port Status: S -- Selected, U -- Unselected

Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,

D -- Synchronization, E -- Collecting, F -- Distributing,

G -- Defaulted, H -- Expired

Aggregate Interface: Route-Aggregation1

Aggregation Mode: Static

Loadsharing Type: Shar

Port Status Priority Oper-Key

--------------------------------------------------------------------------------

GE3/1/1 S 32768 1

GE3/1/2 S 32768 1

GE3/1/3 S 32768 1

以上显示信息表示静态聚合组中，GigabitEthernet3/1/1~ GigabitEthernet3/1/3都是选中状态，流量会从这些接口上通过。

(2) Device A的GigabitEthernet3/1/1端口故障或Device A与DeviceB之间的链路Down时

<DeviceB>%Dec 19 11:25:47:528 2017 DeviceB BFD/5/BFD_CHANG

E_FSM: -MDC=1; Sess[2.1.1.1/224.0.0.184, LD/RD:1540/1540, Interface:GE3/1/1, Se

ssType:Ctrl, LinkType:INET], Sta: UP->DOWN, Diag: 1

%Dec 19 11:25:47:530 2017 DeviceB IFNET/5/LINK_UPDOWN: -MDC=1; Line protocol on

the interface GigabitEthernet3/1/1 is down.

%Dec 19 11:25:47:533 2017 DeviceB LAGG/6/LAGG_INACTIVE_PHYSTATE: -MDC=1; Member

port GE3/1/1 of aggregation group RAGG1 changed to the inactive state, because

the physical state of the port is down.

%Dec 19 11:25:49:162 2017 DeviceB IFNET/3/PHY_UPDOWN: -MDC=1; GigabitEthernet3/0

/1 link status is down.

# 查看Device B的BFD会话。

<DeviceB> display bfd session verbose

Total Session Num: 3 Up Session Num: 2 Init Mode: Active

IPv4 Session Working Under Ctrl Mode:

Local Discr: 1538 Remote Discr: 1538

Source IP: 2.1.1.3 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/3

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 20987 Tx Count: 21191

Connect Type: Direct Running Up for: 00:34:59

Hold Time: 246ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1539 Remote Discr: 1539

Source IP: 2.1.1.2 Destination IP: 224.0.0.184

Session State: Up Interface: GigabitEthernet3/1/2

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 20694 Tx Count: 20905

Connect Type: Direct Running Up for: 00:34:30

Hold Time: 244ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: No Diagnostic

Local Discr: 1540 Remote Discr: 0

Source IP: 2.1.1.1 Destination IP: 224.0.0.184

Session State: Down Interface: GigabitEthernet3/1/1

Min Tx Inter: 100ms Act Tx Inter: 100ms

Min Rx Inter: 100ms Detect Inter: 300ms

Rx Count: 16323 Tx Count: 16816

Connect Type: Direct Running Up for: 00:00:00

Hold Time: 0ms Auth mode: None

Detect Mode: Async Slot: 0

Protocol: Interface

Diag Info: Control Detection Time Expired

# 查看Device B接口上的数据流量。

<DeviceB> reset counters interface

<DeviceB> display counters inbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

GE3/1/1 0 0 0 0

GE3/1/2 185 0 5 0

GE3/1/3 185 0 5 0

# 查看Device B上所有聚合组的详细信息。

<DeviceB>display link-aggregation verbose

Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing

Port Status: S -- Selected, U -- Unselected

Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,

D -- Synchronization, E -- Collecting, F -- Distributing,

G -- Defaulted, H -- Expired

Aggregate Interface: Route-Aggregation1

Aggregation Mode: Static

Loadsharing Type: Shar

Port Status Priority Oper-Key

--------------------------------------------------------------------------------

GE3/1/1 U 32768 1

GE3/1/2 S 32768 1

GE3/1/3 S 32768 1

以上显示信息表示当Device B上BFD协议监视到Device A的GigabitEthernet3/1/1端口down时，立即将BFD状态置为Down，并通知端口模块将端口的链路层状态置为Down。静态聚合组中，GigabitEthernet3/1/1不再是选中状态，流量不会再从此接口上通过。

10.6 配置文件

· Device A：

interface Route-Aggregation1

ip address 192.168.1.1 255.255.255.0

interface GigabitEthernet3/1/1

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 1.1.1.1

port link-aggregation group 1

interface GigabitEthernet3/1/2

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 1.1.1.2

port link-aggregation group 1

interface GigabitEthernet3/1/3

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 1.1.1.3

port link-aggregation group 1

· Device B：

interface Route-Aggregation1

ip address 192.168.1.2 255.255.255.0

interface GigabitEthernet3/1/1

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 2.1.1.1

port link-aggregation group 1

interface GigabitEthernet3/1/2

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 2.1.1.2

port link-aggregation group 1

interface GigabitEthernet3/1/3

port link-mode route

bfd min-transmit-interval 100

bfd min-receive-interval 100

bfd detect-multiplier 3

bfd detect-interface source-ip 2.1.1.3

port link-aggregation group 1

11 相关资料

· H3C SR6600-F 路由器可靠性配置指导-R7607

· H3C SR6600-F 路由器可靠性命令参考-R7607

· H3C SR6600-F 路由器二层技术-以太网交换配置指导-R7607

· H3C SR6600-F 路由器二层技术-以太网交换命令参考-R7607

· H3C SR6600-F 路由器三层技术-IP路由配置指导-R7607

· H3C SR6600-F 路由器三层技术-IP路由命令参考-R7607

· H3C SR6600-F 路由器 MPLS配置指导-R7607

· H3C SR6600-F 路由器 MPLS命令参考-R7607

不同款型规格的资料略有差异, 详细信息请向具体销售和400咨询。H3C保留在没有任何通知或提示的情况下对资料内容进行修改的权利!

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H3C SR6600-F路由器 典型配置举例-R7607-6W101

目录

03-H3C SR6600-F路由器 BFD典型配置举例

3 静态路由与BFD联动配置举例

3.4.1 配置各接口的IP地址

3.4.3 配置Device A的BFD功能

4 RIP与BFD联动配置举例

4.4.1 配置各接口的IP地址

4.4.2 配置RIP基本功能

4.4.3 配置Device A的BFD参数

5 OSPF与BFD联动配置举例

5.2 配置思路

5.4.1 配置各接口的IP地址

5.4.2 配置OSPF基本功能

5.4.3 配置BFD功能

6 IS-IS与BFD联动配置举例

6.4.1 配置各接口的IP地址

6.4.2 配置IS-IS基本功能

6.4.3 配置BFD功能

7 BGP与BFD联动配置举例

7.4.1 配置各接口的IP地址

7.4.2 在AS 100内配置OSPF功能，保证设备间路由可达

7.4.3 配置BGP功能

7.4.5 配置BFD功能

8 策略路由与BFD联动配置举例

8.4.1 配置各接口的IP地址

H3C SR6600-F路由器典型配置举例-R7607-6W101