How to configure Cisco switch with Nortel on 802.3ad

[janusng2000]

How to configure on Cisco to link with Nortel switch with 802.3ad (multi channel trunking)?

I have a triangle setup running on two Nortel core switches with active-active mode, and the Cisco floor switch connect back both switches with multi channel spread trunking. (802.3ad).

I change to Nortel is working fine but I swap to Cisco switch 4950, it seem not working properly....

[ankurbhasin]

Hi Friend,

Can you please confirm which cisco switch you are having , I don't think there is any switch like 4950.

Also whatever cisco switch you have you can configure etherchannel with mode lacp.

Regards,

Ankur

[janusng2000]

Sorry, is typo Cisco Switch 2950 but sure can support mode lacp.

The problem is Cisco switch to one Core switch is working fine, but I spread with two Nortel core switch with triangle setup then the problem seem like some time working or no working.

[ankurbhasin]

Hi Friend,

I don't think your setup will work. AFAIK etherchannel between multiple switches is not supported from Cisco.

If you have 2 parallel links from cisco 2950 to one nortal core switch , etherchannel will work fine with mode lacp but if you have 2 links from 2950 going one to core notal switch 1 and other to core nortal switch 2 etherchannel will not come up.

HTH, if yes please rate the post.

Ankur

[janusng2000]

Hi there,

CAn I said this only the Nortel Swtich can support or is there anyway to resolved it?

[janusng2000]

Dear ankurbhasin,

If I change all to Cisco Switch, the triangle setup will work?

[ankurbhasin]

Hi Friend,

No even then this will not work. Etherchannel between 2 switches will work but etherchannel between multiple switches will not work.

The only platform that supports etherchannel across multiple switches in a stack is the 3750 series.

HTH, if yes please rate the post.

Ankur