[isp-bgp] Re: isp-bgp digest: January 28, 2004

["Nicholas Ferguson" <NicholasFerguson@...>]

It appears that you are running redundant EBGP for  internet access:  A and
B routers.

The example address you provided is a private address... which A and B
shouldn't be learning
via EBGP.

I presume that on the other side of the EBGP is a Service Provider.  Are
they the same?  Or are
they different?  If they are the same SP, then you could ask them if they
update each other...and leave it
at that.

I would agree not to create a default route between your two EBGP's... You
would be creating a transit
space.

Nick


----- Original Message -----
From: "ISP-BGP Discussion List digest" <isp-bgp@...>
To: "isp-bgp digest recipients" <isp-bgp@...>
Sent: Thursday, January 29, 2004 3:00 AM
Subject: isp-bgp digest: January 28, 2004


> ISP-BGP Digest for Wednesday, January 28, 2004.
>
> 1. Data Forwarding
>
> ----------------------------------------------------------------------
>
> Subject: Data Forwarding
> From: Tulip Rasputin <tulip_rasputin@yahoo.ca>
> Date: Wed, 28 Jan 2004 23:56:02 -0500 (EST)
> X-Message-Number: 1
>
> Hello,
>
> I have 2 routers (say A and B) at the edge of my network talking EBGP with
other Autonomous system
> routers, and who are in turn connected via an intermediate non BGP
speaking router (say C). This
> configuration is possible as i may have IBGP routers connected multiple
hops away.
>
> Say A learns 10.0.0.0/8 from its EBGP peer. It advertises this to B via
IBGP. My doubt is that how
> will the traffic coming at B destined for 10.0.0.0/8 reach A, when C has
no knowledge of
> 10.0.0.0/8? The reason why i am saying that C has no knowledge of
10.0.0.0/8 is because we have
> not redistributed BGP into IGP (which has over the time been proven
harmful) and we are not
> running IBGP on C.
>
> I suggested putting a default route on C, but my customer is not ready for
that.
>
> Any clues/suggestions to make this thing work?
>
> Regards,
> Rasputin
>
> ______________________________________________________________________
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>
>
>
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