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New Member

4500-x vss MEC to 2960-x stack

                  Building A

(2) 4500-x VSS

(9) closets with 2960-x stacks

(2) Data Center N5K-C5596t

I'm having a difficult time trying to find documentation.

I have the (2) 4500-x configured with VSS and am trying to find info on connecting the 2960-x stacks.

  • LAN Switching and Routing
Everyone's tags (1)
12 REPLIES
VIP Super Bronze

4500-x vss MEC to 2960-x stack

Hi,

There is nothing special about the connections.  Take 2 connections or more from each stack and connect them to both 4500 (one to each 4500) and put them in a portchannel.  It is just as any other portchannel except this time you are connecting a stack to a pair of VSS switches.

HTH

New Member

4500-x vss MEC to 2960-x stack

command rejected by the 2960-x stack

%With PAgP enabled, all ports in the Channel should belong to the same switch

Command rejected (Port-channel20, Te3/0/1): Invalid etherchnl mode

%With PAgP enabled, all ports in the Channel should belong to the same switch

Command rejected (Port-channel20, Te3/0/1): Invalid etherchnl mode

VIP Super Bronze

4500-x vss MEC to 2960-x stack

Use LACP with 4500 as active and 2960 as passive

New Member

I have all the closet stacks

I have all the closet stacks up using LACP. I'm trying to configure Dual-
Active detection. I think from what I have read I should be able to use fast hello on a dedicated link but it won't accept the commands. I believe the BRAND NEW 4500-x switches may need a NEWER IOS to support fast hello. They were recieved running (cat4500e-UNIVERSALK9-M), Version 03.04.02.SG RELEASE SOFTWARE (fc1).

New Member

4500-x vss MEC to 2960-x stack

You can use PAgP only in single-switch EtherChannel configurations; PAgP cannot be enabled on cross-stack EtherChannels. As Reza mentioned, you can use LACP or mode On.

channel-group X mode active|passive|on

New Member

4500-x vss MEC to 2960-x stack

ok. I'll give that a try. I thought I had read somewhere that it worked with epagp.

VIP Super Bronze

4500-x vss MEC to 2960-x stack

No, MEC works with LACP.

4500-x vss MEC to 2960-x stack

Hi i agree with Reza, epagp works only if 2960x aren't  in stack.

New Member

4500-x vss MEC to 2960-x stack

Hi

yes I think cisco is only giving info about ePAGP to use for MEC with VSS. But for instance my scenario is 2 x 4500-x switches with vss and distribution with a stack of 2 x 3750-x switches and I tried to research about how best to configure MEC. I also have access 2960-x switches with etherchannels to the core. My plan is to use LACP with active active as this is the only option I see. The 4500-x will have 4 x 10 G DAC cables between them for the VSL and use LACP on mode.

So the LACP from any other switches to the VSS core seems not to need any other config apart from the 'active' mode right?

So the VSS will just 'use' such LACP links to pass MEC related checks and then if the VSL link splits it will shutdown all interfaces on the standby VSS switch correct?

Anyone has any ideas for a better option/s ?

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