L2 port channel to L3 port channel

mikegrous · ‎03-03-2009

Is this possible:

SW1

int range fa0/1 - 2

switchport

sw mode access

channel-group 1 mode on

int po 1

sw

sw mode access

int vlan 1

ip add 1.1.1.1 255.255.255.0

SW2

int range fa0/1 - 2

no switchport

channel-group 1 mode on

int po 1

ip add 1.1.1.2 255.255.255.0

I did this config and the links on SW1 did not come up. I should have investigated more but it was easier to just make a bew subnet and put 2 L3 port channels together. So my question is should this have worked or should it not have worked. My logic is that this is no differnt then putting a layer 3 link into a random switchport on that same vlan. In this scenario i am just bundeling more links together.

Jon Marshall · ‎03-03-2009

Mike

Presumably fa0/1 & 2 on SW1 were in vlan 1 ?

If so yes this should work. In fact on a 6500 running Hybrid this is how you would configure that end of the etherchannel.

Jon

mikegrous · ‎03-03-2009

Correct it was Vlan 1. well vlan 10 but for simplicitiy i used vlan 1 in this example. I thought it should work. With a small network and the abundance of private subnets i just took the easier route :). But its good to know it should work. I must have typoed something.

Leo Laohoo · ‎03-03-2009

Didn't know that you could until I found this:

Configuring the Fast EtherChannel

http://www.cisco.com/univercd/cc/td/doc/product/l3sw/8540/cnfg_gd/3cfg8540.htm#xtocid40429