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New Member

ATM IMA links, whats the bandwidth?


Ive a router thats bundled ATM interfaces togthers to creat an IMA interface, however, if I wanted to find out the true Bandwidth capacity available to me on that link where would (which command) i find that? Is it - sh int atm0/ima0 and read the BW statement?


Hall of Fame Super Gold

Re: ATM IMA links, whats the bandwidth?

None of these.

Knowing encapsulation, and average packet length, you can calculate overhead, or true bandwidth.

For a discussion, see:

Hope this helps, please rate post if it does!

New Member

Re: ATM IMA links, whats the bandwidth?

thanks for your post. Your link is not what im after. Im looking for a command that will tell me what my total BW is on an IMA interface if say 1 out of 3 atm grouped interfaces failed.At the moment im taking the WAN providers word that each ATM circuit is 2mb for example.


Hall of Fame Super Gold

Re: ATM IMA links, whats the bandwidth?

Is 2 mpbs before the calculations mentioned the the document linked. If one of three links fail, you will have two thirds of the original bandwidth, because all links carry the same amount of traffic.

It is also possible that due to a link failure, it won't be possible to respect the contractual ATM service level (usually SCR), in that case the entire bundle will fail.

There are configuration commands that control that (min links, etc).

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