RE: Redistribution posted 11/17/2006
Are your redundant links going to be off of the same router on your end, or
If your redundant links are off of the same router (EIGRP's view) I would
suggest taking the simple way. Originate a 0/0 route into EIGRP so that
your internal routers now have a way out. Let BGP handle it's redundancy on
that single router so that you have centralized your decision making.
I agree with Brian that redistributing BGP into an IGP is generally not a
wise move. Particularly if you have only one path out! A router's
efficiency is very often linked to the size of its routing table. So don't
make life overly complicated!
Keep it simple!
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
Sent: Friday, November 17, 2006 10:55 AM
To: tony hall; alexeim@xxxxxxxxxxxxxxx
Subject: RE: Redistribution
It depends on how big your BGP view is. If it's a full view with
150,000 - 200,000 routes then you definitely do not want to redistribute it
into IGP. If it is a much smaller subnet then maybe depending on your
internal routers' free resources. You may also consider originating default
routes from your border routers into your EIGRP domain. If you need more
specific traffic engineering then you can leak any specific routes you want
in from the BGP domain. Also if you have firewalls on your edge or are
running NAT you need to take any asymmetrical routing into account otherwise
traffic flows could be dropped.
Brian McGahan, CCIE #8593 (R&S/SP)
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf
> tony hall
> Sent: Friday, November 17, 2006 5:38 AM
> To: alexeim@xxxxxxxxxxxxxxx
> Cc: ccielab@xxxxxxxxxxxxxx
> Subject: Re: Redistribution
> It is going to one SP but with redundent links for backup/loadshare.
> >From: Alexei Monastyrnyi <alexeim@xxxxxxxxxxxxxxx>
> >Reply-To: alexeim@xxxxxxxxxxxxxxx
> >To: tony hall <tony_hall123@xxxxxxxxxxxxx>
> >CC: ccielab@xxxxxxxxxxxxxx
> >Subject: Re: Redistribution
> >Date: Fri, 17 Nov 2006 11:36:12 +0100
> >is it multi-homing or do you have only one connection to SP?
> >tony hall wrote:
> >>I am running EIGRP internally and BGP externally with SP.What is the
> >>way to obtain connectivity/reachibility in live network both way ,
> >>currentlu running las follow,
> >>1- Redistribute static and connected into BGP and disable sync ,
> >>2- Redistribute BGP into EIGRP with metric 1500 1000 1 255 1500.
> >>Any better suggestion welcome?
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