L2 port channel to L3 port channel

Unanswered Question
Mar 3rd, 2009
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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.


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Jon Marshall Tue, 03/03/2009 - 15:39
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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 Tue, 03/03/2009 - 15:43
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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 Tue, 03/03/2009 - 15:42
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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

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