DMVPN Tunnel down

[Chandhuru sekaran marimuthu]

Hello All,

We have configured two Tunnels in single ISP link for dual connectivity.

Data center1 router <-------------> Edge Router(Tunnel1)

Data center2 router <-------------> Edge Router(Tunnel2)

Above is the setup of DMVPN Tunnel.

Edge Router#sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
N - NATed, L - Local, X - No Socket
# Ent --> Number of NHRP entries with same NBMA peer
NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
UpDn Time --> Up or Down Time for a Tunnel
==========================================================================

Interface: Tunnel2, IPv4 NHRP Details
Type:Spoke, NHRP Peers:2,

# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 Public IP DC1 10.XX.XX.1 UP 13:21:24 S
1 Public IP DC2 10.XX.XX.2 NHRP 07:37:04 S

neighbor 10.XX.XX.1 remote-as 13567
neighbor 10.XX.XX.1 description DC1 Router
neighbor 10.XX.XX.1 password 7 password
neighbor 10.XX.XX.1 update-source Tunnel2
neighbor 10.XX.XX.1 timers 180 540
neighbor 10.XX.XX.1 send-community both
neighbor 10.XX.XX.1 soft-reconfiguration inbound
neighbor 10.XX.XX.1 route-map BGP_INBOUND_3GDMVPN in
neighbor 10.XX.XX.1 route-map BGP_OUTBOUND_3GDMVPN out
neighbor 10.XX.XX.2 remote-as 13567
neighbor 10.XX.XX.2 description DC2 Router
neighbor 10.XX.XX.2 password 7 password
neighbor 10.XX.XX.2 update-source Tunnel2
neighbor 10.XX.XX.2 timers 180 540
neighbor 10.XX.XX.2 send-community both
neighbor 10.XX.XX.2 soft-reconfiguration inbound
neighbor 10.XX.XX.2 route-map BGP_INBOUND_3GDMVPN in
neighbor 10.XX.XX.2 route-map BGP_OUTBOUND_3GDMVPN out

DC2 Router#sh dmv 

0 UNKNOWN 10.XX.XX.104 NHRP never IX

Could you please let us know what would be the reason? and i am sure, it is not issue with ISP since one tunnel is up.

Thanks in advance.

Regards,

Chandhuru

[Chandhuru sekaran marimuthu]

Hello,

Thanks for your reply.

I can try to explain you in more details.

We have two HUB routers and multiple Spokes routers. In all spokes we have single ISP connection and single Tunnel interface, within Tunnel interface we have created sub tunnel to connect HUB1 and HUB2.

Hope you have cleared.

My problem is when ISP has flapped at Spoke end. Only Tunnel2 which connecting to HUB2 not establishing. 

DMVPN routed via BGP routing protocol.

Please suggest your opinions and let me know if you have any questions. Configs of HUB2 and Spoke which is having issue is posted already in previous post. Thanks!

Regards,

Chandhuru

[Georg Pauwen]

Hello,

the tunnel keepalives did not make a difference ?

[Chandhuru sekaran marimuthu]

Hello Georg,

Thanks for your reply.

I guess DMVPN will not support keep alive right ???

Correct me if am wrong and also I read one article from cisco stated that keepalive will not be effect when there is a vrf in place. 

Could you please clarify me???

Regards,

Chandhuru