Forums > General Discussion > Problem in GRE over MPLS Cloud
amitabha
8 posts
2 Mar 2010 at 11:55 a.m. UTC

I am trying to establish a site-to-site IPSec over GRE tunnel with the OSPF routing.

Site-1---->ISP(MPLS Cloud)---->Site-2

The Tunnel is establish alright but the OSPF neighbor is not forming. OSPF states always is in Exchange/Exstart/DOWN mode.

I have already put the command "ip tcp adjust-mss 1360" in Tunnel interface. And also varied the ip mtu size ...like: 1400 or 1500. My ISP is claiming that they have configured MTU size perfectly.

Any tip?
Digital
7 posts
2 Mar 2010 at 12:54 p.m. UTC

Post your source/destination configs for the tunnel if you could.
joshlowe
44 posts
2 Mar 2010 at 8:01 p.m. UTC

For troubleshooting, did you try manually specifying the neighbors?

router ospf 1
neighbor <ip address>
network <network address>

If that works, then perhaps the problem is in the transmitting of multicast packets.

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