Eigrp Neighbouring problem

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Jul 27th, 2008
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Hello,

Im setting up a remote site connectivity to HQ using 2- ATM links. After configuring as per the attached , the two routers are not forming eigrp neighbour Relation.


I can ping 224.0.0.10 from both routers using their respective interface Ip addresses and the setup is working with static routes.


'Show ip eigrp interface' output indicates eigrp is enabled on the interfaces but with Zero count under peer entry.


Ive tried with disabling split horizon under the individual sub-interfaces but no luck.

Any help highly appreciated.




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Kevin Dorrell Mon, 07/28/2008 - 00:11
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Under your eigrp, you need network 192.168.1.0 and network 192.168.2.0. 192.168.x.0 are class C networks, so the network 192.168.0.0 will not cover your interfaces.


I am surprised if show ip eigrp interface shows your WAN links.


Kevin Dorrell

Luxembourg


adowfille Mon, 07/28/2008 - 00:51
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Kevin,

Thanks for your kind response. However sorry I missed out the mask settings on the posted configs. The actual configs used includes the correct mask as bellow:

router eigrp 60

network 192.168.0.0 0.0.0.255

network 10.1.10.0 0.0.0.255


Anything else that I may have missed-out?



Rgds



Kevin Dorrell Mon, 07/28/2008 - 00:58
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That is exactly what I mean. network 192.168.0.0 0.0.0.255 will not cover any of your WAN interfaces on R1. It will only cover interfaces whose addresses lie in the range 192.168.0.x. Your interfaces on R1 are in the 192.168.1.x and 192.168.2.x, so they are not covered.


Kevin Dorrell

Luxembourg

adowfille Mon, 07/28/2008 - 02:23
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Kevin,

Thanks for your kind response and time. I ve updated the entries as follows but still no change


network 192.168.1.0 0.0.0.255

network 192.168.2.0 0.0.0.255



Rgds

Kevin Dorrell Mon, 07/28/2008 - 03:47
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Could you please post a show ip eigrp interfaces detail for each router?


If it were OSPF, I would be checking the adjacency timers are the same on both sides, but EIGRP does not have that constraint.


One thing I do notice is that on the .20 interfaces, both routers have the same IP address. You will need to correct that too.


Another thing you could try is to define static neighbors on each side. I don't know too much about ATM, but I do know it has issues with broadcasts.


Kevin Dorrell

Luxembourg


adowfille Mon, 07/28/2008 - 04:49
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Kevin,

Thanks for your response.Ive actually shutdown interface .20 for now as I try to resolve the peering issue. Ive done similar implementation on ATM /FR without Dot1q taging or sub-interface and it is working fine.

Outputs are as follow:


IP-EIGRP interfaces for process 60


Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes


Fa0/0.10 0 0/0 0 0/10 0 0

Fa0/0.20 0 0/0 0 0/10 0 0


Show ip eigrp interfaces detail output:


Fa0/0.10 0 0/0 0 0/10 0 0

Hello interval is 5 sec

Next xmit serial

Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0

Retransmissions sent: 0 Out-of-sequence rcvd: 0

Authentication mode is not set

Fa0/0.20 0 0/0 0 0/10 0 0

Hello interval is 5 sec

Next xmit serial

Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0

Retransmissions sent: 0 Out-of-sequence rcvd: 0

Authentication mode is not set



Router R2:




AT1/0.10 1 0/0 0 16/608 608 0

Next xmit serial

Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/9402889

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0

Retransmissions sent: 8849745 Out-of-sequence rcvd: 0


AT2/1.20 1 0/0 0 16/608 608 5

Next xmit serial 255091

Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/9402934

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0

Retransmissions sent: 8849793 Out-of-sequence rcvd: 0




Ive already tried the static neighbour entries with no luck.


Rgds


Kevin Dorrell Mon, 07/28/2008 - 05:01
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Mm, I don't see any Hello interval on the ATM side. If you put a static neighbor on R2, does the Hello interval show up?


Kevin Dorrell

Luxembourg


Giuseppe Larosa Mon, 07/28/2008 - 10:39
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Hello Adow,

addition to what Kevin has already observed I would mind about different EIGRP timers:


on one side you have LAN subinterfaces

on the other side you have NBMA ATM interfaces and subinterfaces.

EIGRP will use the usual 5/15 seconds on the LAN but if your ATM interface are T1 or less default timers on the other side are different : 60/180

But actually this is not a problem with EIGRP.


have you added network 192.168.1.0 and network 192.168.2.0 on both routers

under router eigrp 60 ?


Hope to help

Giuseppe

adowfille Mon, 07/28/2008 - 23:59
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Hello Kevin/Giuseppe,

Thank you for sacrificing your valuable time in assisting out.

I ve done static neighbour on both routers and still no change. I believe this has to do with the dot1q tagging/subinterface on R1 since Ive a 3rd site that is also terminating on R2 via ATM without any issues. The only difference is 3rd Site connectivity is via one primary link and there is no sub-interface /tagging configured.


Regards

Giuseppe Larosa Tue, 07/29/2008 - 06:51
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Hello Adow,

just a last thought : you have LAN subifs on one side doing IPv4/Ethernet frames and ATM interfaces on the other side configured for AAL5SNAP IPv4/LLCSNAP/AAL5.

I suppose there is some device in the middle that performs a translation otherwise how could they talk ?


If your hyphotesis is correct you can try to do the following:

declare one of vlan 10,20 as native in order to have untagged frames out or R1

enc dot1q10 native




and you see if this changes something on the first link.


Check also if the atm subifs are up with sh atm pvc on R2.




Hope to help

Giuseppe

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