Etherchannel/Portchannel bandwidth and speed - Cat6500/Nexus

Unanswered Question
Oct 3rd, 2010

I am looking for the documents describing bandwidth and speed on the Portchannel/Etherchannel interfaces.

For the port channel build out of 4 x 1Gb interfaces on the WS-X6148 or WS-X6548 blades we will have 1gb of bandwidth.

For the port channel build out of 4 x 1Gb interfaces on the WS-X6748 blades we will have 4gb of bandwidth.

When you run "show int po1" you will see 40Gb of bandwidth and 1Gb of speed for both cases (61xx/65xx and 67xx blades).

Port channel build out of 4 10Gb interfaces will show 40Gb of bandwidth and 10Gb speed.

What would be real bandwidth on this port-channel?

And the other question would be if there is any way to see real bandwidth for the Port-Channel? Let say to see 4Gb on the port channel on4  WS-X6748 ports.

I have this problem too.
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Atif Awan Wed, 10/27/2010 - 23:57

levter wrote:

I am looking for the documents describing bandwidth and speed on the Portchannel/Etherchannel interfaces.

For the port channel build out of 4 x 1Gb interfaces on the WS-X6148 or WS-X6548 blades we will have 1gb of bandwidth.

For the port channel build out of 4 x 1Gb interfaces on the WS-X6748 blades we will have 4gb of bandwidth.

When you run "show int po1" you will see 40Gb of bandwidth and 1Gb of speed for both cases (61xx/65xx and 67xx blades).

Port channel build out of 4 10Gb interfaces will show 40Gb of bandwidth and 10Gb speed.

What would be real bandwidth on this port-channel?

And the other question would be if there is any way to see real bandwidth for the Port-Channel? Let say to see 4Gb on the port channel on4  WS-X6748 ports.

6148 is a special case due to the line card architecture. For other use cases when you bundle interfaces into a port-channel you do get an aggregate bandwidth equivalent to the sum of the bundled ports. Whether you will be able to use the full bandwidth depends on how traffic is hashed over the links and that is more or less related to the diversity of your flows along with the underlying hashing algorithm. Over time advancements have been made in the actual hashing algorithms so you need to choose the best algorithm for your specific environment.

A word of advise will be to understand the architecture of the product you are implementing bundling on just to be aware of any corner cases. There is no easy way to identify limitations imposed by hardware other than doing your homework first.

Atif

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