From: Blankenship Mr Gary C (BlankenshipGC@xxxxxxxxxxxxxxx)
Date: Sat Sep 04 1999 - 08:32:54 GMT-3
All:
Ooopss... I meant to say "ip ospf network point-to-point" on the loop back
interface! This will advertise the network with whatever subnet you are
using (I'm assuming it is the classful boundary that you are trying to
advertise with BGP?).
Gary
-----Original Message-----
From: Blankenship Mr Gary C
Sent: Saturday, September 04, 1999 12:25 PM
To: 'grcitynet'; Edward Taggart; ccielab@groupstudy.com
Subject: RE: 2 - BGP problems
Question 1: If you put the "no synchronize" 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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