10-16-2012 01:20 AM
Hi guys,
we run 2 GRE tunnels in our network. The A end is a PE router while the B end are 2 different CPE DSL sites.
Both tunnels at the A end (PE) are using as a source a gig sub inteface which is in the same VRF
interface Tunnel40 (for branch office 1)
ip vrf forwarding example
ip address x.x.x.250 255.255.255.252
ip mtu 1476
ip tcp adjust-mss 1420
ip ospf dead-interval 60
ip ospf mtu-ignore
keepalive 10 6
tunnel source Gig x/x.z
tunnel destination x.x.x.x.
tunnel vrf example
interface Tunnel60 (for branch office 2)
the frame is as above
router ospf 1 vrf example
log-adjacency-changes
capability vrf-lite
.
.
passive-interface default
no passive-interface Tunnel40
no passive-interface Tunnel60
network x.x.x.250 0.0.0.0 area x.x.x.x
.network ......
.
CPE example
----------------
interface Tunnel1
ip address x.x.x.249 255.255.255.252
ip flow ingress
ip flow egress
ip ospf dead-interval 60
ip ospf mtu-ignore
keepalive 10 6
tunnel source Dialer1
tunnel destination z.z.z.1 ( this is the subinterafce Gig x/x.z on the PE router)
router ospf 1
router-id x.x.x.x
log-adjacency-changes
passive-interface default
no passive-interface Tunnel1
no passive-interface Vlan1
network x.x.x.x 0.0.0.0 area x.x.x.x
network x.x.x.249 0.0.0.0 area x.x.x.x
same is the config for CPE 2 ( just the frame of the commands no the ospf areas , IP s etc)
The problem is that when the tunnel fails for cpe 1 then it fails for CPE 2 exactly the same time.
Any advice.
Thanks
10-16-2012 06:06 AM
Out of curiosity, does the problem persist if you use "tunnel key" to separate the two tunnels?
M.
10-16-2012 07:04 AM
Hi my friend,
I didnt know about that command and the purpose you use that but I was searching a bit. Do you use that command for
normal GRE tunnels? This is not a point to multipoint topology and every tunnel is a point to point and I run ospf for the point to point link is is differnet area than the other tunnel. Do you beleive that its still could be related to the tunnel key?
Many thanks fo ryour advice. Please reply at your erliest convenience
I know it looks like hub and spoke or point to miltipoint but does it actually dehave like that?
Thank,
Spyros
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