i Have one 2851 router at one of our Customer HO which is connected to remote locations through Lease line via GRE Tunnel. HO has two connectivities. Primary through Lease Line and Secondary through Metro Ethernet. We have configured two GRE Tunnel taking source as both different Media i.e for primary tunnel source - one /30 block routed only towards Lease line by ISP and for secondary tunnel different /30 block routed towards backup Metro ethernet link.
Problem we are facing is , as we make Lease line down , All primary tunnels goes down ,traffic shift to backup tunnels and locations starts working and later if primary link cames up then primary tunnel cames up we are able to ping tunnel source and destination both from HO router and location router but we are not able to ping Tunnel ip address at other end
int tun 0
ip add 220.127.116.11 255.255.255.252
tunnel source x.x.x.x
tunnel destination y.y.y.y
int tun 0
ip add 18.104.22.168 255.255.255.252
tunnel source y.y.y.y
tunnel destination x.x.x.x
we are able to ping x.x.x.x taking source y.y.y.y but not able to ping 22.214.171.124 from HO router and not able to ping 126.96.36.199 from remote loc. router.
Customer Router is Cisco 2851.
Tunnels are configured with Keepalives to make auto failover from primary tunnels to secondary tunnels
Please suggest is this a problem with router IOS or what.