From: Jason Aarons (jaarons@xxxxxxxxxxx)
Date: Mon Sep 06 1999 - 11:55:10 GMT-3
You can do that in a Loopback interface.
It all depends on your IOS Version, see the below note from Cisco TAC I
opened a long time ago when I came across a similar issue.
Hi Jason,
The 'ip ospf network point-to-point' command was added in 11.3(2)
approximately in order to resolve bug CSCdj86198. I've included a brief
description of the problematic behavior and how the new command resolved the
issue.
OSPF advertises loopback interface address as host route by default.
However, it is useful to advertise the address as a stub route in some case.
This fix implement the 'ip ospf network point-to-point'
interface command. When this command is configured on loopback interface,
OSPF will advertise the loopback interface addreses as subnet route just
like what it does for point-to-point interface.
I hope this answers your question. I'll go ahead and close out your case.
Thanks,
John (408) 527-0701
----Original Message Follows----
From: Blankenship Mr Gary C <BlankenshipGC@nocfwd.usmc.mil>
Reply-To: Blankenship Mr Gary C <BlankenshipGC@nocfwd.usmc.mil>
To: GRIZZUTI Javier <jgrizzut@softnet.com.ar>, ccielab@groupstudy.com
Subject: RE: 2 - BGP problems
Date: Mon, 6 Sep 1999 22:44:48 +0100
Javier:
I know, I caught myself. I posted right after that to use the "ip ospf
network point-to-point" command instead. Thanks for the correction though.
At least someone besides me reads my posts.
Gary
> -----Original Message-----
> From: GRIZZUTI Javier [mailto:jgrizzut@softnet.com.ar]
> Sent: Monday, September 06, 1999 10:31 PM
> To: ccielab@groupstudy.com
> Subject: RE: 2 - BGP problems
> Importance: High
>
>
> You cannot do that in a Loopback interface
>
> -----Original Message-----
> From: Blankenship Mr Gary C [mailto:BlankenshipGC@nocfwd.usmc.mil]
> Sent: Sábado, 04 de Septiembre de 1999 08:20 a.m.
> To: grcitynet; Edward Taggart; ccielab@groupstudy.com
> 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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