Contents

Introduction· 1

Prerequisites· 1

Example: Configuring GRE with OSPF· 1

Network configuration· 1

Applicable hardware and software versions· 2

Procedures· 4

Configuring Device A· 4

Configuring Device B· 5

Configuring Device C· 6

Verifying the configuration· 7

Configuration files· 8

 

Introduction

This document provides GRE with OSPF configuration examples.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of GRE and OSPF.

Example: Configuring GRE with OSPF

Network configuration

As shown in Figure 1, Device A is the gateway of the headquarters. Device B and Device C are the gateways of Branch 1 and Branch 2, respectively. The gateways have obtained public IP addresses from an ISP and can communicate with one another. Configure GRE with OSPF to meet the following requirements:

·     The headquarters and the branches communicate with one another through the GRE tunnels established between the headquarters and the branches.

·     The gateways learn the routes reaching the destination networks through the tunnel interfaces.

Figure 1 Network diagram

 

Table 1 Interface and IP address assignment

Device	Interface	IP address	Device	Interface	IP address
Device A	Vlan-int10	191.2.1.1/24	Device B	Vlan-int10	191.3.1.1/24
	Vlan-int20	10.1.1.1/24		Vlan-int20	10.7.1.1/24
	Tunnel1	10.5.1.1/24		Tunnel1	10.5.1.2/24
	Tunnel2	10.6.1.1/24
Device C	Vlan-int10	191.4.1.1/24
	Vlan-int20	10.8.1.1/24
	Tunnel2	10.6.1.2/24

 

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

 

Hardware	Software version
S6812 switch series S6813 switch series	Release 66xx
S6550XE-HI switch series	Release 6008 and later
S6525XE-HI switch series	Release 6008 and later
S5850 switch series	Release 8005 and later
S5570S-EI switch	Not supported
S5560X-EI switch series	Release 63xx, Release 65xx, Release 66xx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 66xx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 66xx
MS4520V2-30F switch	Release 63xx, Release 65xx, Release 66xx
MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 66xx
MS4520V2-28S switch MS4520V2-24TP switch	Release 63xx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 66xx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 66xx
S5000-EI switch series	Release 63xx, Release 65xx, Release 66xx
MS4600 switch series	Release 63xx, Release 65xx, Release 66xx
ES5500 switch series	Release 63xx, Release 65xx, Release 66xx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI switch S5500V3-48P-SI switch	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI switches)	Not supported
S5170-EI switch series	Not supported
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Not supported
S5120V2-SI switch series S5120V2-LI switch series	Not supported
S5120V3-EI switch series	Not supported
S5120V3-36F-SI switch S5120V3-28P-HPWR-SI switch S5120V3-54P-PWR-SI switch	Not supported
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI switches)	Not supported
S5120V3-LI switch series	Not supported
S3600V3-EI switch series	Not supported
S3600V3-SI switch series	Not supported
S3100V3-EI switch series S3100V3-SI switch series	Not supported
S5110V2 switch series	Not supported
S5110V2-SI switch series	Not supported
S5000V3-EI switch series S5000V5-EI switch series	Not supported
S5000E-X switch series S5000X-EI switch series	Not supported
E128C switch E152C switch E500C switch series E500D switch series	Not supported
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Not supported
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Not supported
WAS6000 switch series	Not supported
IE4300-12P-AC switch IE4300-12P-PWR switch IE4300-M switch series IE4320 switch series	Not supported

 

Procedures

Before configuring GRE and OSPF, configure an IPv4 routing protocol on the gateways so that they can reach one another. (Details not shown.)

Configuring Device A

# Configure VLAN-interface 10.

<DeviceA> system-view

[DeviceA] vlan 10

[DeviceA-vlan10] port GigabitEthernet 1/0/1

[DeviceA-vlan10] quit

[DeviceA] interface vlan-interface 10

[DeviceA-vlan-interface10] ip address 191.2.1.1 255.255.255.0

[DeviceA-vlan-interface10] quit

# Configure other interfaces in the same way VLAN-interface 10 is configured. (Details not shown.)

# Create service loopback group 1 and specify tunnel services for the group, and then add GigabitEthernet 1/0/3 to the group. (This step is required for the S6550XE-HI, S6525XE-HI, and S5850 switch series to receive and send tunnel packets.)

[DeviceA] service-loopback group 1 type tunnel

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port service-loopback group 1

[DeviceA-GigabitEthernet1/0/3] quit

# Create a tunnel interface Tunnel 1, and specify the tunnel mode as GRE/IPv4.

[DeviceA] interface tunnel 1 mode gre

# Configure an IP address for the tunnel interface Tunnel 1.

[DeviceA-Tunnel1] ip address 10.5.1.1 24

# Configure the source interface of the tunnel interface Tunnel 1 as VLAN-interface 10.

[DeviceA-Tunnel1] source vlan-interface 10

# Configure the destination address of the tunnel interface Tunnel 1 as the IP address of VLAN-interface 10 on Device B.

[DeviceA-Tunnel1] destination 191.3.1.1

[DeviceA-Tunnel1] quit

# Create a tunnel interface Tunnel 2, and specify the tunnel mode as GRE/IPv4.

[DeviceA] interface tunnel 2 mode gre

# Configure an IP address for the tunnel interface Tunnel 2.

[DeviceA-Tunnel2] ip address 10.6.1.1 24

# Configure the source interface of the tunnel interface Tunnel 2 as VLAN-interface 10.

[DeviceA-Tunnel2] source vlan-interface 10

# Configure the destination address of the tunnel interface Tunnel 2 as the IP address of VLAN-interface 10 on Device C.

[DeviceA-Tunnel2] destination 191.4.1.1

[DeviceA-Tunnel2] quit

# Configure the OSPF router ID as 10.6.1.1.

[DeviceA] router id  10.6.1.1

# Enable OSPF process 1.

[DeviceA] ospf 1

# Create OSPF area 0.

[DeviceA-ospf-1] area 0

# Enable OSPF on interfaces whose primary IP addresses are on network 10.1.1.0/24, 10.5.1.0/24, or 10.6.1.0/24 in area 0.

[DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 10.5.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 10.6.1.0 0.0.0.255

Configuring Device B

# Configure VLAN-interface 10.

<DeviceB> system-view

[DeviceB] vlan 10

[DeviceB-vlan10] port GigabitEthernet 1/0/1

[DeviceB-vlan10] quit

[DeviceB] interface vlan-interface 10

[DeviceB-vlan-interface10] ip address 191.3.1.1 255.255.255.0

[DeviceB-vlan-interface10] quit

# Configure other interfaces in the same way VLAN-interface 10 is configured. (Details not shown.)

# Create service loopback group 1 and specify tunnel services for the group, and then add GigabitEthernet 1/0/3 to the group. (This step is required for the S6550XE-HI, S6525XE-HI, and S5850 switch series to receive and send tunnel packets.)

[DeviceB] service-loopback group 1 type tunnel

[DeviceB] interface gigabitethernet 1/0/3

[DeviceB-GigabitEthernet1/0/3] port service-loopback group 1

[DeviceB-GigabitEthernet1/0/3] quit

# Create a tunnel interface Tunnel 1, and specify the tunnel mode as GRE/IPv4.

[DeviceB] interface tunnel 1 mode gre

# Configure an IP address for the tunnel interface Tunnel 1.

[DeviceB-Tunnel1] ip address 10.5.1.2 24

# Configure the source interface of the tunnel interface Tunnel 1 as VLAN-interface 10.

[DeviceB-Tunnel1] source Vlan-interface 10

# Configure the destination address of the tunnel interface Tunnel 1 as the IP address of VLAN-interface 10 on Device A.

[DeviceB-Tunnel1] destination 191.2.1.1

[DeviceB-Tunnel1] quit

# Configure the OSPF router ID as 10.7.1.1.

[DeviceB] router id 10.7.1.1

# Enable OSPF process 1.

[DeviceB] ospf 1

# Create OSPF area 0.

[DeviceB-ospf-1] area 0

# Enable OSPF on interfaces whose primary IP addresses are on network 10.7.1.0/24 or 10.5.1.0/24 in area 0.

[DeviceB-ospf-1-area-0.0.0.0] network 10.7.1.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] network 10.5.1.0 0.0.0.255

Configuring Device C

# Configure VLAN-interface 10.

<DeviceC> system-view

[DeviceC] vlan 10

[DeviceC-vlan10] port GigabitEthernet 1/0/1

[DeviceC-vlan10] quit

[DeviceC] interface Vlan-interface 10

[DeviceC-Vlan-interface10] ip address 191.4.1.1 255.255.255.0

[DeviceC-Vlan-interface10] quit

# Configure other interfaces in the same way VLAN-interface 10 is configured. (Details not shown.)

# Create service loopback group 1 and specify tunnel services for the group, and then add GigabitEthernet 1/0/3 to the group. (This step is required for the S6550XE-HI, S6525XE-HI, and S5850 switch series to receive and send tunnel packets.)

[DeviceC] service-loopback group 1 type tunnel

[DeviceC] interface gigabitethernet 1/0/3

[DeviceC-GigabitEthernet1/0/3] port service-loopback group 1

[DeviceC-GigabitEthernet1/0/3] quit

# Create a tunnel interface Tunnel 2, and specify the tunnel mode as GRE/IPv4.

[DeviceC] interface tunnel 2 mode gre

# Configure an IP address for the tunnel interface Tunnel 2.

[DeviceC-Tunnel2] ip address 10.6.1.2 24

# Configure the source interface of the tunnel interface Tunnel 2 as VLAN-interface 10.

[DeviceC-Tunnel2] source Vlan-interface 10

# Configure the destination address of the tunnel interface Tunnel 2 as the IP address of VLAN-interface 10 on Device A.

[DeviceC-Tunnel2] destination 191.2.1.1

[DeviceC-Tunnel2] quit

# Configure the OSPF router ID as 10.8.1.1.

[DeviceC] router id 10.8.1.1

# Enable OSPF process 1.

[DeviceC] ospf 1

# Create OSPF area 0.

[DeviceC-ospf-1] area 0

# Enable OSPF on interfaces whose primary IP addresses are on network 10.8.1.0/24 or 10.6.1.0/24 in area 0.

[DeviceC-ospf-1-area-0.0.0.0] network 10.8.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 10.6.1.0 0.0.0.255

Verifying the configuration

# Verify that Host A can ping Host B successfully.

C:\> ping 10.7.1.2

 

Pinging 10.7.1.2 with 32 bytes of data:

 

Reply from 10.7.1.2: bytes=32 time=19ms TTL=253

Reply from 10.7.1.2: bytes=32 time<1ms TTL=253

Reply from 10.7.1.2: bytes=32 time<1ms TTL=253

Reply from 10.7.1.2: bytes=32 time<1ms TTL=253

 

Ping statistics for 10.7.1.2:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 19ms, Average = 4ms

 

# Verify that Host A can ping Host C successfully.

C:\> ping 10.8.1.2

 

Pinging 10.8.1.2 with 32 bytes of data:

 

Reply from 10.8.1.2: bytes=32 time=18ms TTL=253

Reply from 10.8.1.2: bytes=32 time<1ms TTL=253

Reply from 10.8.1.2: bytes=32 time<1ms TTL=253

Reply from 10.8.1.2: bytes=32 time<1ms TTL=253

 

Ping statistics for 10.8.1.2:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 19ms, Average = 4ms

# Verify that Host B can ping Host C successfully.

C:\> ping 10.8.1.2

 

Pinging 10.8.1.2 with 32 bytes of data:

 

Reply from 10.8.1.2: bytes=32 time=20ms TTL=251

Reply from 10.8.1.2: bytes=32 time<1ms TTL=251

Reply from 10.8.1.2: bytes=32 time<1ms TTL=251

Reply from 10.8.1.2: bytes=32 time<1ms TTL=251

 

Ping statistics for 10.8.1.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 19ms, Average = 4ms

Configuration files

IMPORTANT: Support for the port link-mode bridge command depends on the device model.

 

·     Device A

#                                                                              

 service-loopback group 1 type tunnel  

#

vlan 10

#

vlan 20

#

interface Vlan-interface10

 ip address 191.2.1.1 255.255.255.0

#

interface Vlan-interface20

 ip address 10.1.1.1 255.255.255.0

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 10

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 20

#

interface GigabitEthernet1/0/3                                                  

 port link-mode bridge                                                         

 port service-loopback group 1                                                 

#

interface Tunnel1 mode gre

 source vlan-interface10

 destination 191.3.1.1

 ip address 10.5.1.1 255.255.255.0

#

interface Tunnel2 mode gre

 source vlan-interface10

 destination 191.4.1.1

 ip address 10.6.1.1 255.255.255.0

#

router id 10.6.1.1

#

ospf 1

 area 0.0.0.0

  network 10.1.1.0 0.0.0.255

  network 10.5.1.0 0.0.0.255

  network 10.6.1.0 0.0.0.255

#

·     Device B

#                                                                              

 service-loopback group 1 type tunnel  

#

vlan 10

#

vlan 20

#

interface Vlan-interface10

 ip address 191.3.1.1 255.255.255.0

#

interface Vlan-interface20

 ip address 10.7.1.1 255.255.255.0

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 10

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 20

#

interface GigabitEthernet1/0/3                                                  

 port link-mode bridge                                                         

 port service-loopback group 1                                                 

#

interface Tunnel1 mode gre

 source Vlan-interface10

 destination 191.2.1.1

 ip address 10.5.1.2 255.255.255.0

#

router id 10.7.1.1

#

ospf 1

 area 0.0.0.0

  network 10.7.1.0 0.0.0.255

  network 10.5.1.0 0.0.0.255

#

·     Device C

#                                                                              

 service-loopback group 1 type tunnel  

#

vlan 10

#

vlan 20

#

interface Vlan-interface10

 ip address 191.4.1.1 255.255.255.0

#

interface Vlan-interface20

 ip address 10.8.1.1 255.255.255.0

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 10

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 20

#

interface GigabitEthernet1/0/3                                                  

 port link-mode bridge                                                         

 port service-loopback group 1                                                 

#

interface Tunnel2 mode gre

 source Vlan-interface10

 destination 191.2.1.1

 ip address 10.6.1.2 255.255.255.0

#

router id 10.8.1.1

#

ospf 1

 area 0.0.0.0

  network 10.8.1.0 0.0.0.255

  network 10.6.1.0 0.0.0.255

#