GRE over MPLS

Unanswered Question
May 3rd, 2010

Hello people,

im facing  problem trying to establish a GRE tunnel over  mpls. The topology goes as follows:

(server) ----CE1(6500)-----PE1(6500)----vrf cloud-----CE2(6500)--FW

-server needs to establish a gre tunnel with FW.

-server receives a default route from CE1 via OSPF.

-CE1 has an default static route pointing to the next hop which is an interface VLAN (in a vrf)  on PE1.

- PE1 receives a default route generated by CE2 (via mpbgp).

In this situation the GRE tunnel wouldnt come up.The only way i got the GRE to work was replacing the default static route on CE1 with a more specific static route.

On both cases (default AND specific static routes) the connectivity(ping)  from end to end was there.

Has anybody seen anything alike?

thanks,

Bruno

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bgandhi Mon, 05/03/2010 - 09:48

I have observed tunnel flapping issue due to recursive routing. Do you observe the same?

Regards,

Bhavesh              

bruno.hodge Mon, 05/03/2010 - 10:13

That was my first guess, but no, the GRE tunnel doesnt come up when I have default static route configurated and no messages in the log.

Regards,

Bruno

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