GRE Tunnel Doesnt Go Down

[vickyp183]

Hi Friends,

A peculiar problem it seems. I have a GRE tunnel between Router A & B.

If i do a manual shut down on tunnel on router A, the line protocol goes down on router B.. coz of the keepalives set...this is fine. However if the tunnel is manually shut on router B, the line protocol doesnt go down on router A ( which it should coz of the keepalives set)

Both ends have a /30 tunnel ip, source & dest ip * keepalives of 10 3.

Will really appreciate your comments on this

Regards,

Vicky

[Richard Burts]

Vicky

This does sound a bit odd. I believe that there is some difference on the routers that is causing this (either some difference in how they are configured or some difference in what you are doing on the routers to shut down something).

One of the things about GRE keepalives is that the functionality of keepalive for the GRE tunnel is not dependent on the other end supporting GRE keepalive. I am not sure whether this is a factor in your situation or not.

Can you provide configuration details from both routers? And perhaps a bit more specific information about what is shut down on each router?

HTH

Rick

[vickyp183]

Hi Rick,

Thanks for your reply. Have pasted the configs along with the IOS versions. Am just shutting the GRE tunnels turnwise at both the ends. Butt as mentioned below when i manually shut down the tunnel on router B, line protocol still stays up at router A ( even after the keepalive duration)

By using Tunnel mode ipip, the same results were observed.

Router A

interface Tunnel1

description *SECONDARY TUNNEL*

ip address 7.x.x.x.255.255.252

ip mtu 1500

keepalive 3 2

tunnel source 1.1.1.1

tunnel destination 2.2.2.2

end

IOS:c1841-spservicesk9-mz.124-1c.bin

Router B

interface Tunnel12

description Secondary Tunnel for Galaxy

ip address 7.x.x.x.255.255.252

ip directed-broadcast

ip mtu 1500

keepalive 3 2

tunnel source 2.2.2.2

tunnel destination 1.1.1.1

IOS:rsp-pv-mz.120-30.S1.bin