[c-nsp] BGP and IGP

[Peter Nyamukusa]

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of David Barak
> Sent: 01 November 2007 04:04 PM
> To: cisco-nsp at puck.nether.net; Kevin Barrass
> Subject: Re: [c-nsp] BGP and IGP
> 
> 
> 
> 
> 
> --- On Thu, 11/1/07, Kevin Barrass <K.J.Barrass at leeds.ac.uk> wrote:
> 
> > From: Kevin Barrass <K.J.Barrass at leeds.ac.uk>
> > Subject: [c-nsp] BGP and IGP
> > To: cisco-nsp at puck.nether.net
> > Date: Thursday, November 1, 2007, 8:05 AM
> > Hi
> >
> > On our network we currently don't need to run an IGP
> > and use static
> > routes. All the routers run BGP and are in a full iBGP
> > mesh.
> >
> > We are now in a position were we will need to have routers
> > on our
> > network running an IGP and no BGP such as EIGRP. What I am
> > wondering is
> > do ppl in this situation redistribute from BGP into EIGRP
> > the default
> > route they are receiving from the eBGP peer with there
> > provider or is
> > there an other way of doing this.
> >
> > Any Advise on what is best practice on this much
> > appreciated.

If you intend on being a transit network I would recommend running BGP on
all your routers and an IGP to carry your loopback IPs, this is a more
scalable solution

Regards
--------------------
Peter Nyamukusa CCIP, JNCIS-ER, MCSE

> 
> In general terms, I recommend making sure that routers with real
> decisions to make have all of the information.  So a place to start
> would be
> 
> ISPs <=> BGP routers <=> iBGP + EIGRP routers <=> EIGRP only routers
> 
> Where the iBGP + EIGRP router injects an EIGRP default route.  I don't
> recommend redistributing from BGP to an IGP, because you get a tight
> coupling where an ISP ripple gets passed all the way down to the LAN
> routers.
> 
> Hope that helps,
> 
> David Barak
> Need Geek Rock?  Try The Franchise:
> http://www.listentothefranchise.com
> 
> 
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