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L3 Etherchannel facing an L2 etherchannel

ernesttelecom1
Level 1
Level 1

Hello forum, 

 

I found this setup and I was wondering if it is a valid setup to connect two routers via Etherchannel (LACP). One end as L3 with an IP address and the other side as L2 like the config below.

 

----------------------L3 Side (Cisco ASR1001)-----------------------

interface Port-channel2

ip address x.x.x.xx.x.x.x.x

no ip redirects

no ip unreachables

negotiation auto

!

interface GigabitEthernet0/0/2

no ip address

negotiation auto

channel-group 2 mode active

!

interface GigabitEthernet0/0/3

no ip address

negotiation auto

channel-group 2 mode active

 

-----------------------L2 Side (Cisco ASR 920)-----------------------

 

interface Port-channel4
no ip address
negotiation auto
service instance 800 ethernet
encapsulation untagged
bridge-domain 800

!

interface GigabitEthernet0/0/4
no ip address
media-type rj45
negotiation auto
cdp enable
channel-group 4 mode active

!

interface GigabitEthernet0/0/5
no ip address
media-type rj45
negotiation auto
cdp enable
channel-group 4 mode active

 

 

Issue I'm having is on the ASR920 side both interfaces are flaping in/out the etherchannel like the logs 

 

Feb 05 17:19:30.406: GigabitEthernet0/0/4 taken out of port-channel4
Feb 05 17:19:31.267: GigabitEthernet0/0/4 added as member-2 to port-channel4
Feb 05 17:19:46.478: GigabitEthernet0/0/5 taken out of port-channel4
Feb 05 17:19:47.381: GigabitEthernet0/0/5 added as member-2 to port-channel4
Feb 05 17:20:51.949: GigabitEthernet0/0/4 taken out of port-channel4
Feb 05 17:20:52.840: GigabitEthernet0/0/4 added as member-2 to port-channel4
Feb 05 17:21:14.371: GigabitEthernet0/0/5 taken out of port-channel4
Feb 05 17:21:15.260: GigabitEthernet0/0/5 added as member-2 to port-channel4
Feb 05 17:22:14.560: GigabitEthernet0/0/4 taken out of port-channel4
Feb 05 17:22:14.806: GigabitEthernet0/0/4 added as member-2 to port-channel4
Feb 05 17:22:41.367: GigabitEthernet0/0/5 taken out of port-channel4
Feb 05 17:22:42.322: GigabitEthernet0/0/5 added as member-2 to port-channel4

 

 

Thanks for any help

1 Accepted Solution

Accepted Solutions

Richard Burts
Hall of Fame
Hall of Fame

I believe that what you have here is not a valid implementation. When you are doing Etherchannel it can be treated as layer 2 or as layer 3. But both ends of the Etherchannel need to treat it the same way.

 

HTH

 

Rick

HTH

Rick

View solution in original post

1 Reply 1

Richard Burts
Hall of Fame
Hall of Fame

I believe that what you have here is not a valid implementation. When you are doing Etherchannel it can be treated as layer 2 or as layer 3. But both ends of the Etherchannel need to treat it the same way.

 

HTH

 

Rick

HTH

Rick
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