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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 3
Configuration of GRE
3-9
RouterB(config-if-tunnel0)# tunnel destination 192.13.2.1
! Configure a static route to Group1.
RouterB(config)# ipx route 1e 1f.b.b.b 30000 15
3.5 Troubleshooting GRE
As GRE configuration is relatively simple, only the consistency of the configuration
needs to be noted. Here, analyze a relative error, as shown in the following figure:
Fault 1: The interfaces at both ends of the tunnel are properly configured and both ends
of the tunnel can be “pinged” through, but PC A and PC B can not be “pinged” through.
Troubleshooting: In this case, mainly check whether there is a route passing through
tunnel interface. That is, at RouterA, a route to 10.2.0.0/16 passes through Tunnel0
interface; at RouterB, a route to 10.1.0.0/16 passes through Tunnel0 interface (fulfilled
by adding static route).
PC A PC B
Serial0
Serial1
tunnel
10.1.1.1 10.2.1.1
Router A Router BRouter C
Figure VPN-3-7 Networking group of GRE troubleshooting example