Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Link aggregation

Does the Cisco's etherchannel would confirm to IEEE's 802.3ad like another standard for trunking 802.1Q. The reason I asked this question is we have Nortel Equipment which currently connects to Cisco gear which now does 802.1Q trunking between Nortel and Cisco. Also Cisco supports ISL trunking(proprietory I presume). Also Nortel support similar feature called Muti Link Trunking which is same as Cisco's Etherchannel(please correct me if I am wrong). But the standard is 802.3ad. If we follow on the footsteps how OSI was developed it should support whatever way the vendor would implement and call the same in a different name. Does anyone has connected Nortel and Cisco through link aggregation. Thanks.

Cisco Employee

Re: Link aggregation

We have 2 implemetations of etherchannel

1)Cisco Proprietaty PAGP

2)IEEE 802.3ad aka LACP(available in most recent CAT OS/IOS)

LACP is supported in most switches(execptions are XLs and CAT5k). What switches do you have. Here is an example

Regarding truking, we support ISL and IEEE 802.1Q(might depend on hardware/software)

New Member

Re: Link aggregation

We have Catalyst 4006 with Sup III and 6509 with Sup III running native IOS. Thanks for the research and the input.

Cisco Employee

Re: Link aggregation

IOS for Sup3 in CAT4k does not support LACP yet but will in an IOS release expected late this year/early next year.

Native IOS 12.1(13)E for CAT6k which is now on CCO supports LACP

CreatePlease to create content