Changes of State DMVPN intermittent dmvpn

We run a double DMVPN hub and spoke configuration using the router ASR for hubs and 2811 routers for the spoke routers.  Have passed us recently 3000 remote sites and discovered a problem in which we struggle with.  On some routers spoke (we don't know for sure how much), we see that the show in some cases dmvpn responds with IKE or PNDH with one of the peers hub (see below)

Ro1-13349 #sho dmvpn
Legend: Attrb--> S - static, D - dynamic, I - incomplete
Local N - using a NAT, L-, X - no Socket
# Ent--> entries number of the PNDH with same counterpart NBMA
State of the NHS: E--> RSVPs, R--> answer
UpDn time--> upward or down time for a Tunnel
==========================================================================

Interface: Tunnel1, IPv4 PNDH details
IPv4 recording timer: 30 seconds

IPv4 NHS: 10.1.0.1 RE
Type: talk, Total NBMA peers (v4/v6): 1

# Ent Peer NBMA Peer Tunnel Addr add State UpDn Tm Attrb target network
----- --------------- --------------- ----- -------- ----- -----------------
1 A.B.C.D 10.1.0.1 UP 6d14h S 10.1.0.1/32

Interface: Tunnels2, IPv4 PNDH details
IPv4 recording timer: 30 seconds

IPv4 NHS: 10.2.0.1 E
Type: talk, Total NBMA peers (v4/v6): 1

# Ent Peer NBMA Peer Tunnel Addr add State UpDn Tm Attrb target network
----- --------------- --------------- ----- -------- ----- -----------------
1 A.B.C.D 10.2.0.1 IKE 3w6d S 10.2.0.1/32

The State gets between IKE and PNDH and upward.  We captured the data from our 3000 connections 3 times + and we saw about 15 to 20 on each capture data with 1 location that was on every list.

Is there an extra logging that can help determine the cause?  We have recently added dmvpn logging on 32 branches and the typical message we see is as follows

Apr 4 10:34:29.619 CDT: % DMVPN-5-NHRP_NHS: tunnels2 10.2.0.1 is DOWN
Apr 4 10:35:53.048 CDT: % DMVPN-3-NHRP_ERROR: registration failed for on tunnels2 10.2.0.1

In some cases, we get the following

Apr 4 14:28:40.558 CDT: % DMVPN-7-CRYPTO_SS: tunnels2 - A.B.C.D socket is BROKEN

Compensation crypto sessions or a tap continuously on the tunnel has rarely solves the problem.  If the problem returns.  We use a mixture of pre-shared key and CA cryptographic authentication.  We use Version 12.4 (24) T1 as IOS based on other issues.

Please provide any idea that you may have on this type of problem.  I'll add more as discover us more information and has no relevant data to add.

ERP,

I'm afraid that my expertiese lies in troubleshooting, rather than surveillance.

SNMP is an option? (I don't think there's much tagetted for DMVPN)

I thought something similar to this:

http://www.Cisco.com/en/us/docs/iOS/sec_secure_connectivity/configuration/guide/sec_dmvpn_tun_mon.html#wp1055877

(although not sure how well ASR suppoorts this)

Regarding conditional debugging and debugging at all.

There is a debugging, you can generally activate "debug crypto isa err" which displays only the parts of the IKE negotiation error without risk.

For conditional debugging. We can narrown down particular peer VRF interfaces or even particular debugging connections - this however would require that we already know if / what specific rays are affected more than others.

PINGER#debug nhrp condition ?
  interface  based on the interface
  peer       based on the peer
  vrf        based on the vrf

and

PINGER#debug crypto condi ?
  connid     IKE/IPsec connection-id filter
  fvrf       Front-door VRF filter
  isakmp     Isakmp profile filter
  ivrf       Inside VRF filter
  local      IKE local address filter
  peer       IKE peer filter
  reset      Delete all debug filters and turn off conditional debug
  spi        SPI (Security Policy Index) filter
  unmatched  Output debugs even if no context available
  username   Xauth or Pki-aaa username filter

I trust mainly "debug crypto condition homologous ipv4.

Marcin

Tags: Cisco Security

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