IPsec Tunnel

[ghtmoha153]

Hello Team,,,

I work for a service provider and we have a customer who has two branches, one of the branches outside the country and the other connected with us.
He has a problem that there is no service interruption, but he has a problem with the interface tunnel between the two branches, send this trap

This what is his trap:

IPsec Phase-1 IKE Tunnel became inactive.

Does he have a problem with us?
How i can troubleshooting this issue ?

[MHM Cisco World]

Tunnel up/down ' this is not ipsec it is vti or ipsdc over gre tunnel' am I right ?

[ghtmoha153]

This what is his trap
IPsec Phase-1 IKE Tunnel became inactive

[MHM Cisco World]

Tunnel need traffic to initiate phaseI and phaseII 

Here you need two thing 

1- isakmp keepalive 

2- ip sla between two side make tunnel always up.

[ghtmoha153]

[MHM Cisco World]

Can I see show crypto isakmp sa

[ghtmoha153]

no i cant, because it is from customer side and i don't have access on his routers.

[ghtmoha153]

.