From: EA Louie (elouie@xxxxxxxxx)
Date: Fri Nov 16 2001 - 12:50:57 GMT-3
> apologise for not being clear ....
>
You were completely clear - I understood your problem, have experienced it
before, and gave you a way to diagnose the problem.
> The query really is : Do I need to redistribute by directly connected
(Ebgp)
> links that are setup between AS's,into bgp at each of the routers in the
> example ?
>
Do you want to understand the problem, or just solve it? Redistributing
connected is only ONE of the possible solutions to this 'problem' (which
really isn't a problem)
> I just found out that when i did a redistribute connected (under bgp) on
all
> of the routers - the ping goes through from AS4 to the loopback address on
> AS1 ?? My BGP table grew too as a result of all the entries ...
>
I hope that wasn't a surprise to you. Adding networks makes the BGP table
grow.
> Therefore : sounds like EBGP links need to be explicitly brought into the
> "bgp table" across all routers for an end to end IP connectivity to happen
> (network/redistribute connected...)
>
That statement is true only if you have a need to advertise those eBGP links
into BGP because you're
1) unwilling to spend the time and effort or don't have the knowledge to
use an extended ping.
2) see some other value to advertising the eBGP links (as in a need to
telnet to them rather than some other interface across AS's)
3) are expressly instructed to do so by some requirement in an exercise or
the lab
> sounds a bit off .... or i am missing something elementary !!!
>
The 'elementary' things that you're missing:
- knowing how to determine the source IP address of a ping,
- using traceroute to diagnose your routing problem, and
- knowing how to use extended ping and traceroute if the situation requires
it.
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