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Asim Afzal

Eigrp neigborship flaps on dmvpn


We have DMVPN tunnels configure and eigrp running on DMVPN.

From last one week i have seeing logs message that eigrp is flapping on dmvpn neighbors.Link between the 2 sites is stable

Kindly advise show ver is attached from the switch

Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)

Technical Support:

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Wed 13-Aug-08 17:09 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

AJM-RTR-2811 uptime is 18 weeks, 3 days, 23 hours, 51 minutes

System returned to ROM by power-on

System restarted at 16:09:13 UTC Thu Aug 16 2012

System image file is "flash:c2800nm-advipservicesk9-mz.124-15.T7.bin"

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Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.

Processor board ID FHK1043F2BG

2 FastEthernet interfaces

4 ISDN Basic Rate interfaces

1 Virtual Private Network (VPN) Module

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102


Is the tunnel going up/down? How you running this with Ipsec over the internet? If so are you experiencing problems with your internet connection? Is there any good information in the logs, or any recent config changes?

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-- CCNP, CCIP, CCDP, CCNA: Security/Wireless Blog:

thanks for your reply.

Nope its lease line and the link is stable below is DMVPN tunnel config

interface Tunnel1

description ++++ Primary DMVPN Cloud ++++

bandwidth 2048

ip address

no ip redirects

no ip unreachables

no ip proxy-arp

ip mtu 1500

ip hello-interval eigrp 100 10

ip hold-time eigrp 100 30

no ip next-hop-self eigrp 100

ip authentication mode eigrp 100 md5

ip authentication key-chain eigrp 100 EIGRP

ip nhrp authentication PMaouA63

ip nhrp map

ip nhrp map multicast

ip nhrp map

ip nhrp map multicast

ip nhrp network-id 101

ip nhrp holdtime 60

ip nhrp nhs

ip nhrp nhs

ip tcp adjust-mss 1360

no ip split-horizon eigrp 100

tunnel source FastEthernet0/0

tunnel mode gre multipoint

tunnel key 1001

tunnel protection ipsec profile DMVPNPROFILE shared

just to add on above the tunnel is stable.its only eigrp which is flaping

I'll assume EIGRP is running AS 100.

If you debug eigrp does that provide any useful information?

CCNP, CCIP, CCDP, CCNA: Security/Wireless

-- CCNP, CCIP, CCDP, CCNA: Security/Wireless Blog:

Any body find the same issue and found any bug in the IOS related to the issue.


Please ask your ISP if they facing any L2 connectivity issue in cloud, since this is Lease-Line connection but still there could be some connectivity issue at ISP edge if both remote sides A&B are stable. flapping of EIGRP has many reason, it could be connectivity issue, SIA etc.

Did you see any abnormal logs on device or in Syslog if so?