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Beginner

PAgP modes

Hi

 

Old Doc says (4500 series):

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/23408-140.html

 

PAgP modes are off, auto, desirable, and on.

 

New Doc says (cat3850):

 

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/layer2/configuration_guide/b_lay2_3se_3850_cg/b_lay2_3se_3850_cg_chapter_0101.html#con_1275637

 

 only auto, desirable modes

 

which should I believe for the exam?

 

As per my lab test I can only configure Auto and desirable for PAgP.

 

Thanks 

Siva

 

 

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
Advocate

Re: PAgP modes

Hi @sivam siva ,

 

The new document is more specific.
When you have not configured any EtherChannel, we could say that it is in off mode.
The on mode is a static mode, because it is not part of any protocol.
EtherChannel protocols are used to manage the formation of the channel, using messages from that protocol.

 

The new document that you attach this is also indicated:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/layer2/configuration_guide/b_lay2_3se_3850_cg/b_lay2_3se_3850_cg_chapter_0101.html#concept_83730B3BF46E4C81B8D5110EA0840311

EtherChannel On Mode

EtherChannel on mode can be used to manually configure an EtherChannel. The on mode forces a port to join an EtherChannel without negotiations. The on mode can be useful if the remote device does not support PAgP or LACP. In the on mode, a usable EtherChannel exists only when the switches at both ends of the link are configured in the on mode.

Ports that are configured in the on mode in the same channel group must have compatible port characteristics, such as speed and duplex. Ports that are not compatible are suspended, even though they are configured in the on mode.

 

Regards

 

 

4 REPLIES 4
Advocate

Re: PAgP modes

Hi @sivam siva ,

 

The new document is more specific.
When you have not configured any EtherChannel, we could say that it is in off mode.
The on mode is a static mode, because it is not part of any protocol.
EtherChannel protocols are used to manage the formation of the channel, using messages from that protocol.

 

The new document that you attach this is also indicated:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/layer2/configuration_guide/b_lay2_3se_3850_cg/b_lay2_3se_3850_cg_chapter_0101.html#concept_83730B3BF46E4C81B8D5110EA0840311

EtherChannel On Mode

EtherChannel on mode can be used to manually configure an EtherChannel. The on mode forces a port to join an EtherChannel without negotiations. The on mode can be useful if the remote device does not support PAgP or LACP. In the on mode, a usable EtherChannel exists only when the switches at both ends of the link are configured in the on mode.

Ports that are configured in the on mode in the same channel group must have compatible port characteristics, such as speed and duplex. Ports that are not compatible are suspended, even though they are configured in the on mode.

 

Regards

 

 

Highlighted
Beginner

Re: PAgP modes

Hello @luis_cordova 

Thanks for the reply.

 

I agree that, so can I conclude PAgP modes are only auto & desirable?

 

Thanks 

Siva

Advocate

Re: PAgP modes

Hi @sivam siva ,

 

That's right.


The on mode is not part of any protocol.

 

Regards

 

Remember to mark the correct answers as solved, because that helps other users with similar questions

 

 

Beginner

Re: PAgP modes

Thank you  @luis_cordova 

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