From: Edward Taggart (etaggart@xxxxxxxxx)
Date: Sat Sep 04 1999 - 00:39:37 GMT-3
One twist that I think may be causing the sync problem is that between R2
and R5 I am running an nssa area. When the loopback is redistributed into
ospf on R2 it shows up as a N2 route, on R1 it shows up as a E2 route. Does
the bgp IGP table search treat external routes differnetly, thus causing the
sync problem?
R3 <---> R2 <--nssa--> R5
Thanks - Ed
----- Original Message -----
From: Blankenship Mr Gary C <BlankenshipGC@nocfwd.usmc.mil>
To: grcitynet <gr@citynet.net>; Edward Taggart <etaggart@pivot.net>;
<ccielab@groupstudy.com>
Sent: Saturday, September 04, 1999 7:19 AM
Subject: RE: 2 - BGP problems
> Question 1: If you put the "no synchronise" command into the BGP config
> does it advertise? Additionally, OSPF advertises loopbacks as host
routes.
> Try putting the "ip ospf network broadcast" on the loopback interface so
> that it accepts your entire mask. BGP should synch fine after that and
> advertise your route.
>
> -----Original Message-----
> From: grcitynet [mailto:gr@citynet.net]
> Sent: Saturday, September 04, 1999 8:06 AM
> To: Edward Taggart; ccielab@groupstudy.com
> Subject: Re: 2 - BGP problems
>
>
> Question 2
>
> EBGP has distance of 20 but IBGP has a distance of 200. If you are talking
> about IBGP in your question then OSPF with a distance of 110 would be
> prefered.
>
> ----- Original Message -----
> From: Edward <mailto:etaggart@pivot.net> Taggart
> To: ccielab@groupstudy.com <mailto:ccielab@groupstudy.com>
> Sent: Friday, September 03, 1999 5:58 PM
> Subject: 2 - BGP problems
>
> I have 2 bgp problems that are driving me crazy.
>
> Question 1: I have 3 routers in the same AS. They are connected as
> follows:
>
> R3 <---> R2 <---> R5
>
> They all can reach each other fine through OSPF routes. R5 also has a
> loopback that is being redistributed via OSPF. I configured 2 peer
> statments on all routers providing a full mesh for the IBGP AS (all
sessions
> show active). The network that the loopback's address resides in is being
> advertised to BGP by R5. When doing a "show ip bgp" it shows up in all 3
> routers bgp table. However, R3 does not advertise the route to an
external
> AS. When doing a "debug ip bgp update" on R3 I see that it is complaining
> that the loopbacks network is not synchronized. However, the loopbacks
> network is in the IGP routing table..
>
> Now, if I remove the peer statements between R3 & R5 and setup R2 with
> router-reflector-client statements, R3 advertises the route to the
loopback
> to the external AS.
>
> How I understood it was that routers in the same AS do not need to be
> directly connected to their peers, they just need IP reachability to them
> and a full mesh peer configuration (or route a reflector). What am I
> missing?
>
>
> Qustion 2:
> If I have an OSPF route and BGP route on a router for the same network,
what
> would keep the BGP route from injecting itself into the routing table
given
> that BGP has a lower administrative distance than OSPF?
>
> The following is from a "show ip bgp" command
> *> 192.192.2.0 132.4.7.5 0 100 0 (1034 1099) i
>
> The following is from a show ip route from the same router as above:
> O E2 192.192.2.0/24 [110/20] via 132.4.8.2, 00:37:01, Serial1
>
> This particular router is in it's own AS so the 192.192.2.0 route is
coming
> in from AS1034 then AS1099..
>
> Any help would be greatly appreciated. I'm looking through both Caslow's
> and Halabi's books and can't seem to find the answer to these problems.
>
>
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