H3C Routers

GRE with OSPF Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

Introduction· 1

Prerequisites· 1

Example: Configuring load sharing NAT server 1

Network configuration· 1

Software versions used· 2

Procedures· 2

Prerequisites· 2

Configuring Device A· 2

Configuring Device B· 3

Configuring Device C· 4

Verifying the configuration· 5

Configuration files· 6

Device A· 6

Device B· 6

Device C· 7

Related documentation· 7

 

Introduction

This document provides GRE with OSPF configuration examples.

Prerequisites

The following information applies to Comware 9-based routers. Procedures and information in the examples might be slightly different depending on the software or hardware version of the routers.

The configuration examples 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 load sharing NAT server

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	GE1/0/1	191.2.1.1/24	Device B	GE1/0/1	191.3.1.1/24
	GE1/0/2	10.1.1.1/24		GE1/0/2	10.7.1.1/24
	Tunnel 1	10.5.1.1/24		Tunnel 1	10.5.1.2/24
	Tunnel 2	10.6.1.1/24
Device C	GE1/0/1	191.4.1.1/24
	GE1/0/2	10.8.1.1/24
	Tunnel 2	10.6.1.2/24

 

Software versions used

This configuration example was created and verified on R9141P16 of the MSR2630E-X1 device.

Procedures

Prerequisites

# Configure an IPv4 routing protocol on the gateways so that the gateways can reach one another. (Details not shown.)

Configuring Device A

# Configure an IP address for GigabitEthernet 1/0/1.

<DeviceA> system-view

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] ip address 191.2.1.1 255.255.255.0

[DeviceA-GigabitEthernet1/0/1] quit

# Configure IP addresses for other interfaces. (Details not shown.)

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

[DeviceA] interface tunnel 1 mode gre

# Configure an IP address for tunnel interface Tunnel 1.

[DeviceA-Tunnel1] ip address 10.5.1.1 24

# Configure the source interface of Tunnel 1 as GigabitEthernet 1/0/1.

[DeviceA-Tunnel1] source gigabitethernet 1/0/1

# Configure the destination address of Tunnel 1 as the IP address of GigabitEthernet 1/0/1 on Device B.

[DeviceA-Tunnel1] destination 191.3.1.1

[DeviceA-Tunnel1] quit

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

[DeviceA] interface tunnel 2 mode gre

# Configure an IP address for tunnel interface Tunnel 2.

[DeviceA-Tunnel2] ip address 10.6.1.1 24

# Configure the source interface of Tunnel 2 as GigabitEthernet 1/0/1.

[DeviceA-Tunnel2] source gigabitethernet 1/0/1

# Configure the destination address of Tunnel 2 as the IP address of GigabitEthernet 1/0/1 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 an IP address for GigabitEthernet 1/0/1.

<DeviceB> system-view

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] ip address 191.3.1.1 255.255.255.0

[DeviceB-GigabitEthernet1/0/1] quit

# Configure IP addresses for other interfaces. (Details not shown.)

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

[DeviceB] interface tunnel 1 mode gre

# Configure an IP address for tunnel interface Tunnel 1.

[DeviceB-Tunnel1] ip address 10.5.1.2 24

# Configure the source interface of Tunnel 1 as GigabitEthernet 1/0/1.

[DeviceB-Tunnel1] source gigabitethernet 1/0/1

# Configure the destination address of Tunnel 1 as the IP address of GigabitEthernet 1/0/1 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 an IP address for GigabitEthernet 1/0/1.

<DeviceC> system-view

[DeviceC] interface gigabitethernet 1/0/1

[DeviceC-GigabitEthernet1/0/1] ip address 191.4.1.1 255.255.255.0

[DeviceC-GigabitEthernet1/0/1] quit

# Configure IP addresses for other interfaces. (Details not shown.)

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

[DeviceC] interface tunnel 2 mode gre

# Configure an IP address for tunnel interface Tunnel 2.

[DeviceC-Tunnel2] ip address 10.6.1.2 24

# Configure the source interface of Tunnel 2 as GigabitEthernet 1/0/1.

[DeviceC-Tunnel2] source gigabitethernet 1/0/1

# Configure the destination address of Tunnel 2 as the IP address of GigabitEthernet 1/0/1 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

Device A

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 191.2.1.1 255.255.255.0

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 10.1.1.1 255.255.255.0

#

interface Tunnel1 mode gre

 source GigabitEthernet1/0/1

 destination 191.3.1.1

 ip address 10.5.1.1 255.255.255.0

#

interface Tunnel2 mode gre

 source GigabitEthernet1/0/1

 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

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 191.3.1.1 255.255.255.0

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 10.7.1.1 255.255.255.0

#

interface Tunnel1 mode gre

 source GigabitEthernet1/0/1

 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

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 191.4.1.1 255.255.255.0

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 10.8.1.1 255.255.255.0

#

interface Tunnel2 mode gre

 source GigabitEthernet1/0/1

 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

#

Related documentation

·     Layer 3—IP Routing Configuration Guide in H3C MSR1000[2600][3600] Routers Configuration Guides(V9)

·     Layer 3—IP Routing Command Reference in H3C MSR1000[2600][3600] Routers Configuration Guides(V9)

·     IP Tunneling and Security VPN Configuration Guide in H3C MSR1000[2600][3600] Routers Configuration Guides(V9)

·     IP Tunneling and Security VPN Command Reference in H3C MSR1000[2600][3600] Routers Configuration Guides(V9)