ISIS over etherchannel on ASR1006

Unanswered Question
Dec 8th, 2008

Hi,

I`m trying to run isis over etherchannel subinterface on an ASR1006 and i`m getting the following error message:

CLNS-3-BADPACKET: ISIS: LAN L2 hello, Duplicate system ID detected....

Here is my ethernchannel config:

interface Port-channel10

no ip address

negotiation auto

!

interface Port-channel10.110

description switch

encapsulation dot1Q 110 primary GigabitEthernet0/2/0 secondary GigabitEthernet2/2/0

ip address 192.168.6.245 255.255.255.252

!

interface Port-channel10.120

description router2

encapsulation dot1Q 120 primary GigabitEthernet0/2/0 secondary GigabitEthernet2/2/0

ip address 192.168.6.249 255.255.255.252

ip router isis

And her`s the "debug isis adj"

*Dec 8 07:58:03: ISIS-Adj: Sending L2 LAN IIH on Port-channel10.120, length 1497

*Dec 8 07:58:03: ISIS-Adj: Rec L2 IIH from 0023.04bb.7bc9 (Port-channel10.120), cir type L2, cir id 1720.3107.9197.02, length 1497

*Dec 8 07:58:03: ISIS-Adj: Duplicate system id

*Dec 8 07:58:06: ISIS-Adj: Sending L2 LAN IIH on Port-channel10.120, length 1497

*Dec 8 07:58:06: ISIS-Adj: Rec L2 IIH from 0023.04bb.7bc9 (Port-channel10.120), cir type L2, cir id 1720.3107.9197.02, length 1497

*Dec 8 07:58:06: ISIS-Adj: Duplicate system id

*Dec 8 07:58:08: ISIS-Adj: Rec L2 IIH from 001f.ca04.cee8 (Port-channel10.120), cir type L2, cir id 1720.3107.9197.02, length 1497

*Dec 8 07:58:08: ISIS-Adj: Rec L2 IIH from 001f.ca04.cee8 (Port-channel10.120), cir type L2, cir id 1720.3107.9197.02, length 1497

*Dec 8 07:58:09: ISIS-Adj: Sending L2 LAN IIH on Port-channel10.120, length 1497

*Dec 8 07:58:09: ISIS-Adj: Rec L2 IIH from 0023.04bb.7bc9 (Port-channel10.120), cir type L2, cir id 1720.3107.9197.02, length 1497

*Dec 8 07:58:09: ISIS-Adj: Duplicate system id

Does anyone one the solution??

Kristian

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Giuseppe Larosa Mon, 12/08/2008 - 09:06

Hello Kristian,

>> *Dec 8 07:58:03: ISIS-Adj: Duplicate system id

Verify the IS-IS system-id of all three devices involved in vlan 120.

The system-id have to be different and unique in the IS-IS domain.

Another possibility is that some other device is sending back ASR's own hellos so it complains about duplicated IS-IS ID.

Hope to help

Giuseppe

klauritzen Wed, 12/10/2008 - 07:40

Hi,

Thanks for the reply.

The ISIS system ID is unique.

I`m starting to think there might be a problem running ISIS over etherchannel...

I tried to look for an configuration example on this but couldn't find anything. I might have to check with cisco if ISIS over etherchannel is supported.

Kristian

Giuseppe Larosa Wed, 12/10/2008 - 09:30

Hello Kristian,

I don't know if it is supported on ASR 1000 but we use IS-IS and on bundles of GE ports with C6500 it is supported, actually our etherchannels are L2 trunks and the IS-IS configuration is issued in the SVI Vlans.

if the system ids are unique the only chance is that someone is bridging traffic of the two vlans so that your ASR is receiving on vlan x its own hellos sent out vlan y.

Hope to help

Giuseppe

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