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EtherChannel on C3750G

hi all,

i was asked to set auto/auto on gig ports for an etherchannel and i got the below syslog.

Nov 16 12:46:30.218 SGT: %EC-5-CANNOT_BUNDLE2: Gi2/0/10 is not compatible with Gi3/0/10 and will be suspended (speed of Gi2/0/10 is 100M, Gi3/0/10 is 1000M)

port g2/0/10 is now "suspended"  due to speed mismatch. i would like to know if server NIC (controlled by another admin) on port g2/0/10 needs to be configured to 1000 mbps to solve this issue?

is auto/auto locally configured on both g2/0/10 and g3/0/10 will work for etherchannel port or is it dependent on the remote device (server)?

3750#sh etherchannel summ | i 10

10     Po10(SU)        LACP      Gi2/0/10(s) Gi3/0/10(P)

3750#sh int g2/0/10 status

Port      Name               Status       Vlan       Duplex  Speed Type

Gi2/0/10  Server-NIC1       suspended    177        a-full  a-100 10/100/1000BaseTX

3750#sh int g3/0/10 status        

Port      Name               Status       Vlan       Duplex  Speed Type

Gi3/0/10  Server-NIC2       connected    177        a-full a-1000 10/100/1000BaseTX

2 ACCEPTED SOLUTIONS

Accepted Solutions
New Member

EtherChannel on C3750G

Yes, the ports must be twin. Same speed same configuration, and same media. The 2/0/10 must be a-full a-1000. Don't try to force interface it will work but it can create a lot of performance problem. Try to ask to the other admin to configure interface at 1000 and enable NIC Timing of course.

New Member

EtherChannel on C3750G

hi john,

it is actually dependend on the other side as well, as if the switch side is configured as auto and the server side as e.g. 1000mbit full, it is still possible that a duplex missmatch will occur.

auto on both sides is the best solution i would say and auto is also the recommended best practice from cisco as far as i know.

otherwise configure it like fabio mentioned.

regards,

florian

3 REPLIES
New Member

EtherChannel on C3750G

Yes, the ports must be twin. Same speed same configuration, and same media. The 2/0/10 must be a-full a-1000. Don't try to force interface it will work but it can create a lot of performance problem. Try to ask to the other admin to configure interface at 1000 and enable NIC Timing of course.

New Member

EtherChannel on C3750G

hi john,

it is actually dependend on the other side as well, as if the switch side is configured as auto and the server side as e.g. 1000mbit full, it is still possible that a duplex missmatch will occur.

auto on both sides is the best solution i would say and auto is also the recommended best practice from cisco as far as i know.

otherwise configure it like fabio mentioned.

regards,

florian

Re: EtherChannel on C3750G

Thanks for your inputs!

Sent from Cisco Technical Support iPhone App

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