GRE tunnel problem
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From: Tosh on 1 Jun 2010 01:44 >The tunnel interfaces show admin up but protocol down. >I have tried >shut/no shut and that doesn't do anything. Once I had a similar issue with a 3750 L3 switch as a tunnel endpoint, removing the keepalive command made the trick and after that the tunnel worked like a charm for years. Don't know if it was a release related issue or what. Bye, Tosh.
From: Andy Davidson on 8 Jun 2010 05:32 ve7eje <ve7eje(a)gmail.com> wrote: > The tunnel interfaces show admin up but protocol down. I have tried > shut/no shut and that doesn't do anything. Next time this happens, I > will try a few more things. Sorry to echo the thoughts of others, but I have never seen this either. How long are you waiting for the tunnel to establish? Can you ping the endpoint address when the tunnel fails to come back ? Is anything logged ? Can you attach a monitor port to some intermediate switch between the device to see whether the tunnel is attempting to rebuild ? Same IOS both sides ? Tunnel in same state when down at both sides ? Sorry to have no magic bullet. Andy. www.netsumo.com // ISP consultancy
From: IDDQD on 28 Jun 2010 11:09 I have the same problem with the GRE tunnels + OSPF on both 2811 (R1) and 2821 (R2) routers. IOS 12.4(12) and 12.4(24)T. R1 connected to ISP1 R2 connected to ISP2 Both ISPs provided its own MPLS network Each of that routers terminates several tunnels to a branch offices where we usualy have a 1841 or 1721 routers with different IOSes R1 R2 are linked together via ethernet and both are belongs to an OSPF area 0. There is no any other links betwenn that routers. All is working well but 2-3 times a week something strange is happening. Several tunnels goes down simulteniously on both R1 and R2. links to ISP1 or ISP2 did not flaps though but tunnels goes down. To get the tunnel UP I have to delete the tunnel from a config of a branch router, wait for a minute or two and then make the tunnel again. This is not a routing issue because we are using static routes to a tunnels endpoints BTW We have 3d 2811 router with a GRE tunnels + OSPF to all of our branches via Internet. It has the same IOS 12.4(12) but have no such problems at all P.S. sorry for my terrible english --- frmsrcurl: http://compgroups.net/comp.dcom.sys.cisco/GRE-tunnel-problem
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