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NE20E GRE tunnel cannot up

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Issue Description

GRE tunnel cannot up on NE20E router, the GRE source and destination can reach each other. GRE tunnel use loopback 0 of the deivce as the tunnel source. There is no security device beween the two NE20E. After configure GRE tunnel, the physical and protocol state are always down.

eb91cb83a69746529ee30218cb6468c5

transparent.gif Alarm Information

Tunnel0/1/0                       12.1.1.2/24     down       down     --  


transparent.gif Handling Process

1. Checking the GRE configuration on the both side and the configuration is right.

#

interface LoopBack0

 ip address 30.1.1.1 255.255.255.255

 binding tunnel gre

#

#

interface Tunnel 0/1/0

 ip address 12.1.1.2 255.255.255.252

 tunnel-protocol gre

 source 30.1.1.1

 destination 20.1.1.1

#

2. Check the reachability between the GRE source and destination, They can reach each other.

transparent.gif Root Cause

For the Nbox device, the number of the tunnel must be one-dimensional. For the chassis NE router, the number should be three-dimensional.

transparent.gif Solution

Change the number of the GRE tunnel to one-dimensional on both side and the issue resolved.

#

interface Tunnel 1

 ip address 12.1.1.2 255.255.255.252

 tunnel-protocol gre

 source 30.1.1.1

 destination 20.1.1.1

#

  • x
  • convention:

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