From: Joe Jia (ellenjjl@xxxxxxxxxx)
Date: Sun Jun 02 2002 - 22:37:35 GMT-3
David,
Thanks for your summary.
But I just want to say that if you want to redistribute the iBGP route into
OSPF, ospf will not put this route into its database, it will only accept
the EBGP routes.
I mean in Tony's example, for the 80 network, the command "redistribute bgp
2 metric 1592 subnets" will not work, because it is an iBGP route.
Joe
----- Original Message -----
From: "David Ham" <ccieau@hotmail.com>
To: <ellenjjl@rogers.com>; <tron@huapi.ba.ar>
Cc: <trussell@ibeam.com>; <ccielab@groupstudy.com>
Sent: Friday, May 31, 2002 9:28 PM
Subject: Re: BGP into ospf
> Joe,
> Here is my understanding of IBGP into IGP.
>
> Yes. You are right. it is no good to redistribute IBGP into IGP in real
> network. As huge number of networks belong BGP will redistribute into IGP.
> Your customer will be very upset if they see all the routes the world
have.
> :) There are two ways you can do with other than using IBGP/IGP
> redistribution.
> 1. set up fully meshed IBGP with "no syn'. -- no pratical if you need to
> setup large number of IBGP.
> 2. set up a default route for IGP networks for outside ( BGP world ).
>
> Hope this help.
>
> David Ham
> OPTUS
>
>
> >From: "Joe Jia" <ellenjjl@rogers.com>
> >Reply-To: "Joe Jia" <ellenjjl@rogers.com>
> >To: "Carlos G Mendioroz" <tron@huapi.ba.ar>, "David Ham"
> ><ccieau@hotmail.com>
> >CC: <trussell@ibeam.com>, <ccielab@groupstudy.com>
> >Subject: Re: BGP into ospf
> >Date: Sun, 2 Jun 2002 20:35:01 -0400
> >
> >Hi,
> >
> >As I understand, also reading Internet Routing Archetecture(2nd edtion),
in
> >order to prevent routing loop, iBGP will nver be redistributed into OSPF.
> >So you need to select which point to redistribute this specifical route
on
> >the router where it is learned. If wrong, please correct me.
> >
> >Joe
> >
> >
> >----- Original Message -----
> >From: "Carlos G Mendioroz" <tron@huapi.ba.ar>
> >To: "David Ham" <ccieau@hotmail.com>
> >Cc: <trussell@ibeam.com>; <ccielab@groupstudy.com>
> >Sent: Friday, May 31, 2002 7:10 PM
> >Subject: Re: BGP into ospf
> >
> >
> > > Or it could be a connected network (local) in which case,
> > > you would need to redistribute connected to make it work.
> > >
> > > This seems to be a loop prevention system...
> > >
> > > David Ham wrote:
> > > >
> > > > Tony,
> > > >
> > > > It looks like synchronisation problem.
> > > >
> > > > Do the " NO SYN" or try match Router ID on BGP and OSPF.
> > > >
> > > > David Ham
> > > > OPTUS
> > > >
> > > > >From: Tony Russell <trussell@ibeam.com>
> > > > >Reply-To: Tony Russell <trussell@ibeam.com>
> > > > >To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
> > > > >Subject: BGP into ospf
> > > > >Date: Fri, 31 May 2002 11:39:08 -0500
> > > > >
> > > > >I am trying to redistribute some BGP routes into OSPF.. one of the
> >routes
> > > > >is
> > > > >making it and the other is not.... I am unsure as to why.. can
anyone
> >shed
> > > > >any light on this???? I am wondering if there is anything specific
> >that I
> > > > >should know about BGP to OSPF redistribution that I am obviously
> >missing.
> > > > >Here are some specifics
> > > > >
> > > > > 172.168.0.0/24 is subnetted, 2 subnets
> > > > >B 172.168.70.0 [20/170] via 137.20.10.70, 00:10:46
> > > > >B 172.168.80.0 [200/170] via 137.20.86.1, 00:00:49
> > > > >
> > > > >The 172.168.70.0 route is making it to the next router but the
> >172.168.80.0
> > > > >is not.
> > > > >
> > > > >Here are the bgp entries
> > > > >
> > > > >*> 172.168.70.0/24 137.20.10.70 170 0 3 i
> > > > >*>i172.168.80.0/24 137.20.86.1 170 100 0 1 i
> > > > >
> > > > >The 80 route shows the i for iBGP, but I thought it should still
make
> >it
> > > > >into OSPF
> > > > >
> > > > >Here is the redistribute command
> > > > >redistribute bgp 2 metric 1592 subnets
> > > > >
> > > > >Lets say that R1 has the BGP routes and R1 and R2 are running
> >OSPF....
> > > > >after
> > > > >redistributing BGP into OSPF I fully expected both routes to
show...
> >but
> > > > >only one does....
> > > > >
> > > > >Tony Russell
> > > > >Media Engineer
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