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TOPIC: Question on Etherchannel Protocol

Question on Etherchannel Protocol 11 years 1 month ago #23110

  • Jowee
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I had a friend who I think misconfigure the Etherchannel protocol in his company. But I am not sure about it.

When I ask him to give me a "show etherchannel summary". The protocol field is empty. And the "show run" also didnt show any etherchannel protocol on it. I asked him what protocol he used for the Etherchannel, but he wasnt sure about it.

As far as I know, you need to tell the switch to use either LACP or PAgP when you configure an Etherchannel right? How come his network still working like normal???

Is there any way to check if the ether channel is running alright??

Cheers

Re: Question on Etherchannel Protocol 11 years 1 month ago #23111

  • Smurf
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As far as i know, PAgP provides Automatic EtherChannel config and negotiation between Cisco Switches. I would have thought the protocol should be listed though ?
Wayne Murphy
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Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.

Re: Question on Etherchannel Protocol 11 years 1 month ago #23112

  • Jowee
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u mean PAgP will auto nego the protocol if both switch is Cisco? The weird thing is, the show etherchannel summary did not show the protocol. The protocol field was blank...wierd.

Re: Question on Etherchannel Protocol 11 years 1 month ago #23114

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Yup, according to Cisco's Website

"Port aggregation protocol (PAgP) aids in the automatic creation of Fast EtherChannel links. PAgP packets are sent between Fast EtherChannel-capable ports in order to negotiate the forming of a channel. "

Not sure about the protocol missing, i have always manually configured the etherchannel
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.

Re: Question on Etherchannel Protocol 11 years 1 month ago #23205

Has your problem been resolved?
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