From: Peter van Oene (pvo@usermail.com)
Date: Fri Nov 01 2002 - 16:06:37 GMT-3
At 10:50 AM 11/1/2002 -0800, Jim Terry wrote:
>Thanks for the response but I am still confused. So,
>
>am I correct in saying, even though the loopback on the remote AS is in my
>IP and BGP tables if I dont have a static for it I cannot get to it?
If you have valid BGP routes that resolve to link local next hops as they
should, over an EBGP connection, you should be fine.
>In this case does the no sync command destroys the validity of the IP table?
>Would I have to redistribute the static into BGP or IGP?
Sync is irrelevant in EBGP connections. For your loopbacks to ping each
other, you just need them reachable in the local routing table as
normal. Are you seeing the loopbacks in both tables as valid?
>Thanks,
>
>JT
>
>----- Original Message -----
>From: "Peter van Oene" <pvo@usermail.com>
>To: "Jim Terry" <jtixthus@attbi.com>; <ccielab@groupstudy.com>
>Sent: Friday, November 01, 2002 10:41 AM
>Subject: Re: BGP: no sync vs. redistribution
>
>
> > At 09:18 AM 11/1/2002 -0800, Jim Terry wrote:
> > >Hi all,
> > >
> > >I have a theoretical question. When I am using no sync in the BGP
>process
> > >are there still times that I must redistribute the IGP into the BGP
>process
> > >in order to route to another AS where I am not running an IGP between the
> > >two ASs?
> >
> > It is highly abnormal to run an IGP between AS's. With the exception of
> > multihop EBGP where static routes might be used, the AS to AS DMZ usually
> > consists of a single link, which is link local to each AS's border router.
> >
> >
> > >For instance, routers A and B are in AS 1 with an IGP and IBGP. Router B
> > >has EBGP to C and no IGP from B to C. Router C is in AS 2. I cannot
>ping
> > >from a loopback on Router B to a loopback on C even though the loopback
>is
> > >in the BGP and IP routing tables on B. If I do a mutual redistribution
>on B
> > >in the BGP and IGP processes I am then able to ping.
> >
> > Likely C can't get back to B.
> >
> > >Is this correct, or am I just doing something wrong?
> > >
> > >Thanks,
> > >
> > >JT
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