Solved

What's the default protocol when you set etherchannel mode to ON

Posted on 2008-10-13
4
1,533 Views
Last Modified: 2008-10-14
If you configure and etherchannel and set the mode to ON, for both sides what's the default protocol it uses? When I do a show etherchannel I just see a "-" for protocol.
0
Comment
Question by:typertec
  • 2
  • 2
4 Comments
 
LVL 12

Expert Comment

by:Pugglewuggle
ID: 22708602
There is no default protocol for etherchannel... etherchannel is etherchannel.
If you mean a dynamic routing protocol (probably what you're seeing) then that's just RIP or EIGRP, or something like that - if you don't use it that doesn't matter.
Cheers!
0
 
LVL 10

Accepted Solution

by:
kyleb84 earned 200 total points
ID: 22710413
Etherchannel uses a Cisco proprietary protocol called PAGP (Port AGgregation Protocol).

The alternate is LACP - Link Aggregation Control Protocol (also called 802.3ad), this can be used also in newer switches/routers - and Cisco still calls it "EtherChannel" (It just uses LACP to do it).

LACP is a IEEE standard, and is regarded as the superior protocol, but I think Cisco still uses PAgP to add even more functionalilty to LACP (And retain backward compatibility).

To answer your question:

What Cisco will use by default is dependant on the type of switch and it's firmware version.
- According to the Cisco web site LACP features first started to appear in IOS Release 12.2(31)SB2
0
 
LVL 10

Expert Comment

by:kyleb84
ID: 22710432
One way to tell I guess is in your logs it'll say either "PAGP-xxxx" entries or "LACP-xxxx" entries depending on which is being used.
0
 
LVL 12

Assisted Solution

by:Pugglewuggle
Pugglewuggle earned 150 total points
ID: 22710464
That is right, as I said, etherchannel only operates on its protocol. Good bit of additional info though kyle! :)
Unless something else is specified, even new switches use the default etherchannel protocol (PAGP, as you say).
LACP is only used in conjuction with switches from other vendors that don't support Cisco etherchannel.
In other words - if both switches are Cisco then it doesn't matter.
Cheers!
0

Featured Post

New My Cloud Pro Series - organize everything!

With space to keep virtually everything, the My Cloud Pro Series offers your team the network storage to edit, save and share production files from anywhere with an internet connection. Compatible with both Mac and PC, you're able to protect your content regardless of OS.

Join & Write a Comment

In this tutorial I will show you with short command examples how to obtain a packet footprint of all traffic flowing thru your Juniper device running ScreenOS. I do not know the exact firmware requirement, but I think the fprofile command is availab…
When posting a question about a Cisco ASA, Cisco Router or Cisco Switch, it can aid diagnosis if a suitably sanitised copy of the config is provided. It is much better to leave as much of the configuration as original as possible, as it could be tha…
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now