Huawei AR1200 Series - Page 50

Configuration Roadmap
To enable the Keepalive function on one end of the GRE tunnel, run the keepalive command in
the tunnel interface view on the end.
TIP
If the Keepalive function is enabled on the source end, the forwarding function is obligatory, and the
Keepalive function is optional for the destination end.
Data Preparation
To complete the configuration, you need the following data:
l Data for configuring the routing protocol for the backbone network
l Source address and destination address of the GRE tunnel
l Interval for sending Keepalive messages
l Parameters of unreachable timer
Procedure
Step 1 Configure Router A and Router B to implement the interworking between the two devices.
The detailed procedures are not mentioned here.
Step 2 Configure a tunnel on Router A and enable the Keepalive function.
<RouterA> system-view
[RouterA] interface tunnel 0/0/1
[RouterA-Tunnel0/0/1] ip address 40.1.1.1 255.255.255.0
[RouterA-Tunnel0/0/1] source 20.1.1.1
[RouterA-Tunnel0/0/1] destination 30.1.1.2
[RouterA-Tunnel0/0/1] keepalive period 20 retry-times 3
[RouterA-Tunnel0/0/1] quit
Step 3 Configure a tunnel on Router B and enable the Keepalive function.
<RouterB> system-view
[RouterB] interface tunnel 0/0/1
[RouterB-Tunnel0/0/1] ip address 40.1.1.2 255.255.255.0
[RouterB-Tunnel0/0/1] source 30.1.1.2
[RouterB-Tunnel0/0/1] destination 20.1.1.1
[RouterB-Tunnel0/0/1] keepalive period 20 retry-times 3
[RouterB-Tunnel0/0/1] quit
Step 4 Verify the configuration.
# The tunnel interface on Router A can successfully ping the tunnel interface on Router B.
<RouterA> ping -a 40.1.1.1 40.1.1.2
PING 40.1.1.2: 56 data bytes, press CTRL_C to break
Reply from 40.1.1.2: bytes=56 Sequence=1 ttl=255 time=9 ms
Reply from 40.1.1.2: bytes=56 Sequence=2 ttl=255 time=7 ms
Reply from 40.1.1.2: bytes=56 Sequence=3 ttl=255 time=7 ms
Reply from 40.1.1.2: bytes=56 Sequence=4 ttl=255 time=7 ms
Reply from 40.1.1.2: bytes=56 Sequence=5 ttl=255 time=7 ms
--- 40.1.1.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 7/7/9 ms
# Enable the debugging of the Keepalive messages on Router A and view information about the
Keepalive messages.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 1 GRE Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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