Please Check Filters - BOGON Filtering IP Space

Hank Nussbacher hank at
Fri Jan 21 07:01:13 UTC 2005

On Thu, 20 Jan 2005, James Laszko wrote:

> Well, if the router CAN run BGP, the feed from Cymru is only about 84
> prefixes - not a lot of memory tied up there, is there?

I am *not* talking about the leaf - rather the core.  I am curious what
resources are needed to manage 200K BGP peers other than 200K IP
addresses.  Is there an IOS limit on the number of BGP peers?  Memory?


> If the router isn't capable of BGP, someone earlier today was kind
> enough to post a script that they use to find changes to one of the
> BOGON lists and suggested an Expect script to automatically update their
> router.  Probably a little advanced for most leaf sites, but for someone
> who's responsible for a larger network -- doesn't seem that bad.
> James Laszko
> Pipeline Communications, Inc.
> james at
> -----Original Message-----
> From: Hank Nussbacher [mailto:hank at]
> Sent: Thursday, January 20, 2005 10:51 PM
> To: James Laszko
> Cc: nanog at
> Subject: RE: Please Check Filters - BOGON Filtering IP Space
> On Thu, 20 Jan 2005, James Laszko wrote:
> > sort of mechanism.  If they're not going to use something like the
> Cymru
> > BOGON BGP feed they should build their own and should have configured
> > their managed routers to query that from the beginning.  As more
> How would this scale for say 200K routers?  2M?  -Hank
>  +++++++++++++++++++++++++++++++++++++++++++
>  This Mail Was Scanned By Mail-seCure System
>  at the Tel-Aviv University CC.

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