Cisco EtherChannel Port Limits

Posted on 2012-08-23
Last Modified: 2012-08-24
We have a couple of Cisco WS-C3560E-24TD switches and a several more WS-C2960S-48TS-L switches.  I have not been able to find our how many ports on each device can be assigned to an EtherChannel trunk or how many trunks are allowed on each switch.

Any help is appreciated.
Question by:lpg1068
    LVL 17

    Expert Comment

    2960S is limited to a maximum of 8 physical ports,3560E should be the same ... please note that there are other limits you may hit by putting together that many ports (number of ARP requests, etc.)

    2960 can have up to 6 channel groups, the 3560E I have access to at the moment would allow up to 48 ports (at least as far as the interface number that's allowed), can't find the docs that list the actual number ...

    Author Comment

    I'm new to Cisco and didn't think to try the command 'show etherchannel'

    Some output from our 2960...

    Group: 1
    Group state = L2
    Ports: 4   Maxports = 16
    Port-channels: 1 Max Port-channels = 16
    Protocol:   LACP
    Minimum Links: 0

    This would lead me to believe that we can have up a combination of 16 ports and 16 channels per switch.  The 3560 gave me the same results and is running 14 ports and 5 groups right now.
    LVL 17

    Accepted Solution

    Negative, the 2960S will only allow up to 6 port channels to be configured ... try the "conf t" and "int port-channel ?", it will suggest 1-6 as valid options. As for the number of physical ports, I can't find an appropriate document from Cisco that would specify the maximum ...
    Anyway, if you have a switch that's not in production use (or has a sufficient number of free ports), just try sticking them all into one port channel and see whether the IOS will let you put 16 in there ...

    Author Comment

    Yeah, I will have to try hit the maximums by trial and error.  I can't find any documentation either.  Thanks for the help.

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