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Thread Index [isp-bgp] Re: Routing Information
So is there a reason to use OSPF or another protocol? I can't see what it
gives me. I figure iBGP would do everything I need.
Serge.
----- Original Message -----
From: "Pete Templin" <petelists@...>
To: <isp-bgp@isp-bgp.com>
Sent: Sunday, February 29, 2004 2:49 PM
Subject: [isp-bgp] Re: Routing Information
>
> James wrote:
> >>When using IBGP internally is it typical to use internal AS#'s for the
> >>internal routers/switches or do you use them all with your AS# and the
> >>next-hop parameter?
> >
> >
> > when using IBGP:
> > *) all routers in IBGP chain must speak using same ASN
> > *) all routers in IBGP must be peered in full mesh[1]
> > [1]: exception of rr's
>
> Or use confederations...
>
> >>I'm thinking that it may be wise for me to have my Layer3 Switch
advertise
> >>my address blocks to my routers. That way the routers will advertise to
> >>each other also.
> >
> > my line of thinking is this. if you have both routers right now as
> > you currently have, joined in IBGP peering, each announcing a /24..
> > it doesn't seem to make a lot of difference to me than your current
> > setup. what happens if one of the router's Ethernet to switch goes
> > down? yes, it will realize its gone, so it will withdraw the
announcement
> > which will then still propagate to your upstream and cause a flap
anyway.
> > if you use floating static route to null on each router, even if the
ethernet
> > goes down, it will continue advertising the prefix as its manually
announced
> > using network a.b.c.d command.
>
> Two routers peered by IBGP will SHARE their internal routes. If ONE
> router loses connectivity to the switch, the other router will continue
> to announce the route to all IBGP routers, which will propagate the
> route to appropriate EBGP peers based on the local policy. The route
> will not flap (assuming all parameters stay the same) to the outside
world.
>
>
>
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