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3750X etherchannel with different capacity interfaces

johnramz
Beginner
Beginner

Image: C3750e-ipbasek9-mz.122-58.SE2.bin"

Two stacks of 4 switches each

Each stack has one module : C3KX-NM-10GT

So I could create a 20--GBit erherchannel. But what If I want to create a 22-Gbit etherchannel?

Could I use the Two(2) 10-Gbit interfaces on each stack plus Two(2) 1-Gbit interfaces on EACH stack ?

Is this doable? Does fall out of best practices?

If yes please provide CISCO document that supports it.

Thanks

Juan

9 Replies 9

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend
But what If I want to create a 22-Gbit etherchannel?

Won't work.  Not unless you've manage to find two 11 Gbps ports.

Most important rule-of-thumb with Etherchannels:  Each physical interface need to be the same speed.

Thanks Leo. I figured that was the answer "All LAN ports in each EtherChannel must be the same speed, and you must configure all the ports as either Layer 2 or Layer 3 LAN ports." according to the link provided by Ankur.

We currently have a 2-GB etherchannel between those two stacks. so what I might do is to set up a new 20-GB etherchannel and let STP take care of keeping the 2-GB link in passive mode.

Juan

Ankur Arora
Beginner
Beginner

Hi,

You won't be able to create a 22Gig etherchannel using two 10gig ports and two 1gig ports.

As all the interfaces in an etherchannel should have the exact same speed.

You may go through the below document:

http://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html#catalyst

Thanks

Ankur

"Please rate the post if found useful"

Thanks Ankur.

We currently have a 2-GB etherchannel between those two stacks. so what I might do is to set up a new 20-GB etherchannel and let STP take care of keeping the 2-GB link in passive mode.

Juan

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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Just to add to what the others have already noted.  You can use different media, e.g. fiber and copper, but again, both need to be same "speed".

If you only have one module in your stack, you can have 4 gig, 2 10g, or 2 gig and 1 10g.  I.e. you cannot have 22 gig, even without Etherchannel.