EIGRP not forming adjacency

Unanswered Question
Nov 26th, 2008

Hi, I have an issue on an ATM router were the EIGRP adjacency are only forming in one direction.

The design is a hub and spoke, point to multipoint. The remote sites connect to the head end router via sub interfaces on the head end router. The issue I am seeing is that the remote site see the head end router as an EIGRP neighbour, however the head end router does not see the remote site as a neighbour, and as such no routing updates are passed.

The strange thing is, if I reboot the router, the EIGRP works fine until the Head end router's ATM drops

The config from the Head end router is

interface ATM0/0/0.30 multipoint

pvc 30/33

encapsulation aal5mux ppp Virtual-Template1

pvc 30/34

pvc 30/35 etc for all the sites

interface Virtual-Template1

ip unnumbered Loopback1

no peer default ip address

ppp authentication pap

Interface Loopback1

description ***Remote Sites WAN Interface***

ip address 192.168.227.1 255.255.255.0

router eigrp 1

redistribute connected

network 192.168.200.0

network 192.168.227.0

no auto-summary

The Config from the remote site ADSL router is

interface ATM0

no ip address

no atm ilmi-keepalive

dsl operating-mode ansi-dmt

!

interface ATM0.1 point-to-point

description **To Augres**

no snmp trap link-status

pvc 0/38

encapsulation aal5mux ppp dialer

dialer pool-member 1

!

!

interface ATM0.2 point-to-point

no snmp trap link-status

pvc 0/39

encapsulation aal5mux ppp dialer

dialer pool-member 2

interface Vlan1

ip address 192.168.25.1 255.255.255.0

hold-queue 100 out

!

interface Dialer1

bandwidth 512

ip unnumbered Loopback1

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication pap callin

ppp pap sent-username xxxxx password xxxx

!

!

router eigrp 1

redistribute connected

network 192.168.25.0

network 192.168.227.0

network 192.168.229.10 0.0.0.0

auto-summary

eigrp stub connected summary

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Giuseppe Larosa Wed, 11/26/2008 - 04:22

Hello Richard,

the remote site is point-to-point while the hub has a multipoint interface

I think for each pvc you need on the hub

pvc 30/34

protocol ip remote-side-loopback broadcast

this allow the router to map also EIGRP multicast hellos to the neighbors(s)

Hope to help

Giuseppe

richard.jackson Wed, 11/26/2008 - 07:48

Hi Giuseppe,

Thanks for the reply. Though it hasn't resolved the issue it has pointed me in the right direction to the underlying fault.

If I multicast ping from the head end router to the remote site, I get a reply back from all the remote sites. However if I carry out the same from the remote site I do not set any replies!.

Any other thoughts?

Regards

Giuseppe Larosa Wed, 11/26/2008 - 08:14

Hello Richard,

another possible option to get rid of multicast hellos is to use the neighbor command so that unicast messages are exchanged.

This is also a way to detect if the problem is with the multicast nature of Hellos

under router eigrp add

on hub

a neighbor ip-address for each remote

on remote

a single neighbor statement for hub

Hope to help

Giuseppe

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