[nsp] BGP Entries - Comparison

[Tantsura, Jeff]

Hi,

Normally, tier 1 providers filter /20 and longer (probably not anymore),
tier 2/3 filter /24 and longer.

Jeff

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Paul Stewart
Sent: Wednesday, June 16, 2004 4:33 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] BGP Entries - Comparison

Hi everyone...

I'm trying to diagnose why our upstream providers have some varying
numbers of routes coming to us...

Provider A has 136992
Provider B has 141471
Provider C has 121855

These are three full feeds coming into us... Why the huge difference in
numbers?  I realize that there will be differences based on connectivity
etc. but that much??

I'm currently looking at how many /25 /26 /27 etc. *small* subnets are
hitting us, as Provider B is sending us thousands of /27 blocks and even
thousands of /29 blocks....

Is anyone cutting tables off at /24 and what has your experience been?
I thought for some reason that you were not even allowed to advertise
any subnets smaller than /24's via BGP anyways or am I dreaming? :)

Thanks,

Paul Stewart

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