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BGP Number of NLRIs in the update sent

What determines the max. value regarding "Number of NLRIs in the update sent"? We have two identical routers with the same amount of memory, but the max values of the NLRI's that will fit into an update are very different. The transport media off of both routers are the same. I would greatly appreciate your help.


Re: BGP Number of NLRIs in the update sent

It depends on a lot of factors, but generally:

-- The attributes of the routes in the table. If the routes in your local BGP table have a lot of common attributes, we are going to be able to pack more routes into any given update.

-- The version of code. Some versions of IOS pack better than others do.

-- The amount of "one off" changes handled by a router. We get the best packing at initial starup. As individual changes to the bgp table are processed, we won't pack those very well, since we tend to receive and send them one or two at a time, unless there's a major link flap where you lose and regain a lot of prefixes at the same time. The longer a router has been running, the fewer number of prefixes it will pack into an update "on average," because that's the way averages work.

Hope that helps...



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