bgp question

adrian kok adriankok2000 at yahoo.com.hk
Thu May 25 13:34:16 UTC 2006


Hi all

Thank you all for your answer to my previous question
'RFC1918 from ISP'

I have another BGP question, and may be related to BGP
dampening.

We have a client whose IP is in the block X.X.0.0/19
which doesn't
show in our router.  However, our BGP log records that
we have
received this route from our peer isp.  I reboot the
router, seeing that the route was
in our router only to disappear again after couple of
minutes.  I
suspect that it may have been removed by the BGP
dampening feature in
our router.  By disabling the feature, the route will
stay in our
router.

Q1/ My only understanding of the benefit of this
feature is to prevent
'unstable' route from flooding to our router, causing
a CPU overflow.
What's the risk of leaving this off?

Q2/ What is the cause of these route that frequently
send to our
router as stated below?  Once our other routes are in
our BGP DB, then
it will not be re-broadcast to us except withdraw from
our peer isp

> 2006/05/26 08:30:34 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:33:42 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:36:46 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:39:49 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:45:25 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:48:00 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:49:02 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:51:34 BGP: our-peer-isp rcvd
x.x.0.0/19
> 2006/05/26 08:52:36 BGP: our-peer-isp rcvd
x.x.0.0/19

Q3/ Do you know any good website to montior the
routing network?
I just heard this scoreboard.keynote.com from
http://isc.sans.org/diary.php
but it needs register

Thank you very much




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