mlacp

[Serge D]

Hi,

I am trying to configure mlacp on 2 routers asr903 but the command

port-channel mc-lag

on global configuration mode is unrecognized. When I ignore it and apply the

mclag configuration

the command

show redundancy interchassis

shows the peer as connected from each router. But when I check the port-channel via the command

show lacp multichassis port-channel

I see the lag state is down onthe peer. Is it possible that this issue be related to the command

port-channel mc-lag

I ignored? How can I solve it?

Regards

[Georg Pauwen]

Hello,

hard to say what you are missing. Do you have

port-channel min-link

configured on each router ? Post the full configs of both routers, and have a look at the document linked below:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-3s/asr903/lanswitch-ethernet-channel-xe-3s-asr903-book/lanswitch-ethernet-channel-xe-3s-asr903-book_chapter_010.pdf

[Serge D]

Hi Georg,

Please find below the full configuration of both routers. In front of the 2 routers, I have equipment from Nokia on which a normal

lacp lag

is configured with passive mode.

========================================PE-2============================================
redundancy
mode sso
interchassis group 1
member ip 10.10.10.39
mlacp node-id 1
mlacp system-mac 1111.1111.1111
mlacp system-priority 90
backbone interface Gi0/1/2

!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32767
mlacp interchassis group 1

!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active
!

==============================================PE-1=====================================

redundancy
mode sso
interchassis group 1
member ip 10.10.10.119
mlacp node-id 2
mlacp system-mac 2222.2222.2222
mlacp system-priority 100
backbone interface Gi0/1/2

!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32768
mlacp interchassis group 1

!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active
!

Regards.

[Georg Pauwen]

Hello,

I have a feeling that this is the problem (the Nokias). I could not find any information on the mutlichassis functionality working in a multi-vendor environment...

[balaji.bandi]

what is the version of code on ASR and License you have.

what is other side device model of Nokia ?

[Serge D]

Cisco IOS XE

Software, Version 03.18.03.SP.156-2. SP3-ext 

License Level: metroservices

The other side device is a level 2 device, a DSLAM.

[Georg Pauwen]

Hello,

I am not sure I understand the physical topology, can you post a diagram ? How is the (Nokia) DSLAM involved here ?

[Serge D]

Hello,

The physical topology

Regards

[Georg Pauwen]

Hello,

try and add the line in bold to both routers:

redundancy
mode sso
interchassis group 1
member ip 10.10.10.39
--> monitor peer bfd
mlacp node-id 1
mlacp system-mac 1111.1111.1111
mlacp system-priority 90
backbone interface Gi0/1/2
!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32767
mlacp interchassis group 1
!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active




redundancy
mode sso
interchassis group 1
member ip 10.10.10.119
--> monitor peer bfd
mlacp node-id 2
mlacp system-mac 2222.2222.2222
mlacp system-priority 100
backbone interface Gi0/1/2

!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32768
mlacp interchassis group 1

!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active

[Serge D · Accepted solution]

Hi Georg,

I tried it but it didn't work. The port-channel was still down on both routers. And then I added the service instance in bold under the port-channel configuration and it goes up. I think that's what I was missing.

redundancy
mode sso
interchassis group 1
member ip 10.10.10.39

monitor peer bfd
mlacp node-id 1
mlacp system-mac 1111.1111.1111
mlacp system-priority 90
backbone interface Gi0/1/2
!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32767
mlacp interchassis group 1

service instance 1 ethernet

  encapsulation untagged

  l2protocol peer lacp


!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active


redundancy
mode sso
interchassis group 1
member ip 10.10.10.119

monitor peer bfd
mlacp node-id 2
mlacp system-mac 2222.2222.2222
mlacp system-priority 100
backbone interface Gi0/1/2

!
interface Port-channel1
lacp fast-switchover
lacp max-bundle 3
mlacp lag-priority 32768
mlacp interchassis group 1

service instance 1 ethernet

  encapsulation untagged

  l2protocol peer lacp

!
interface TenGigabitEthernet0/0/0
no ip address
lacp rate fast
channel-group 1 mode active

Thanks, everyone for your support.

Regards.