From: Jerry Haverkos (jhaverkos@xxxxxxxxxxxxxxx)
Date: Wed May 22 2002 - 11:20:07 GMT-3
I would add:
Getting routes in the BGP table is not the end goal.
The end goal is to get routes in the IP routing table.
Having routes in the BGP table allows BGP peers to propagate routes to one
another. Somewhere along the line you'll probably want those routes injected
(either statically or dynamically) into an IGP.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Taimoor Husain
Sent: Tuesday, May 21, 2002 8:07 PM
To: Jeongwoo Park; ccielab@groupstudy.com
Subject: RE: routing table vs. bgp table
JP,
It does not mean that you will necessary have those routes in the routing
table as well. If the routes have been learnt from IBGP and synchronization
is turned on (default), then the router will need to learn those routes from
an IGP as well, to :
a) install it in its routing table
b) advertise it to its EBGP peer.
Solution is to turn synchronization off, or to redistribute the routes
between IGP and BGP.
Another reason it is not installing in the routing table could be if the
next hop that is advertised to the Router for that particular network is not
accessible (not in routing table).
A ---- ebgp ------ B ----ibgp ------- C ----ibgp ----- D
In this case it would mean Router D will have router A's loopback in its BGP
table but since the next hop will be router B's interface to which router D
does not have a path, it will mark the route inaccessible and not install it
in the routing table.
A good way to see this, is to do a show ip bgp x.x.x.x on the network in the
bgp table (which is not appearing in the routing table), and you should
see an inaccessible on that.
Solution for this is to force the next hop on the router to be where it
learned the route from (next hop self in the neihgbor command).
In answer to your question, if the route is not in the routing table, you
will not be able to ping it.
Regards,
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:|: :|: Taimoor Husain
:| | |: :| | |: CCIE # 9315
.:| | | | | | |:. .:| | | | | | |:. taimoor@cisco.com
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