GRE tunnel keepalives not working on 1 end
Posted on 2011-10-06
i am trying to enable GRE tunnel keepalives in order for our floating static routes to kick in should there be a problem in the GRE tunnel path.
we operate a hub and spoke network. The GRE tunnels are IPSEC protected using crypto maps.
wehn i enable the keepalives on the tunnel interfaces, at the hub end we get replies and the tunnel is in up/up state, but at the remote site the router sends the keepalive but does not get the reply, and this puts the tunnel interface in a up/down state
debug tunnel keepalive at hub...
Oct 5 07:56:50.456: Tunnel178: sending keepalive, 188.8.131.52->184.108.40.206 (l
en=24 ttl=255), counter=1
Oct 5 07:56:50.520: Tunnel178: keepalive received, 220.127.116.11->18.104.22.168 (
len=24 ttl=245), resetting counter
and also the same debug at the remote site...
277303: Oct 4 11:37:11.473 GMT: Tunnel179: sending keepalive, 22.214.171.124->62.
28.21.152 (len=24 ttl=255), counter=18840
277337: Oct 4 11:37:16.472 GMT: Tunnel179: sending keepalive, 126.96.36.199->62.
28.21.152 (len=24 ttl=255), counter=18841
277345: Oct 4 11:37:21.471 GMT: Tunnel179: sending keepalive, 188.8.131.52->62.
28.21.152 (len=24 ttl=255), counter=18842