From: sanjay (ccienxtyear@xxxxxxxxxxx)
Date: Tue Aug 14 2001 - 14:55:17 GMT-3
That is excatly whats going on. When doing a trace, the packet gets dropped
at the HUB (since it has 2 subinterface). When I just use the physical
interface on the HUB router, then I can ping the BGP net from R2. I am
working on a practice lab that asked for this scenario. Maybe theres some
way of doing this with route map on R2. I will play with it and let you know
if I get it to work. Thanks for your feedbacks..
thanks,
Sanjay
----- Original Message -----
From: "Jay Chandradas" <jachandr@cisco.com>
To: "sanjay" <ccienxtyear@hotmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, August 14, 2001 10:47 AM
Subject: Re: BGP Scenario
> sanjay,
>
> I think you may have to run BGP on hub router as wel. I think.. this is
what
> is hapening correct if I am wrong.
>
> in R2 the next hop to reach the BGP backbone is the address of R3 facing
> r1.. this is correct. Now when a pkt tries to reach the BGp net.. from
R2..
> it finds the next hop as the ip address of R3.. R2 in turn does a
recursive
> look up and send the pkt to r1. Now r1 has no idea about the BGP routes
that
> we are talking about.. It drops the packet.
>
> Jay.
> ----- Original Message -----
> From: "sanjay" <ccienxtyear@hotmail.com>
> To: "Jay Chandradas" <jachandr@cisco.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Tuesday, August 14, 2001 10:28 AM
> Subject: Re: BGP Scenario
>
>
> > Jay,
> >
> > I do have "no sync" on R3 and R2 and also both of them have the
> > next-hop-self command. When I configure BGP on R1, then I can ping from
R2
> > to the BGP net. I can ping the BGP net from R3. On R2, the next hop
> address
> > to reach the BGP net is the address of R3. I can ping from R2 to R3
> without
> > any issues. It's just weired.
> >
> > thanks,
> > Sanjay
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Jay Chandradas" <jachandr@cisco.com>
> > To: "sanjay" <ccienxtyear@hotmail.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Monday, August 13, 2001 8:48 PM
> > Subject: Re: BGP Scenario
> >
> >
> > > sanjay,
> > > I think I missed some points ..
> > >
> > > Can you ping BGP net from R3 successfully.. ? I assume u can.
> > >
> > > in R2 what is the next hop to reach the BGP nets..may be ur DMZ is not
> > > known to the inside network . In that case you may have to do a next
hop
> > > self at R3.
> > >
> > > HTH
> > > Jay.
> > >
> > > At 07:05 PM 8/13/2001 -0700, sanjay wrote:
> > > >I have 3 routers in a hub & spoke configuration across a frame cloud.
> R1
> > has 2
> > > >sub-interfaces. One goes to R2 and the other to R3. Between
> (subinterface
> > > >1)R1---R2, I have OSPF running and between (subinterface 2) R1--R3, I
> > have
> > > >IGRP running. OSPF and IGRP are configured with a /24 mask and so
> > > >redistribution is working fine. From R3, I have a serial connection
to
> a
> > BGP
> > > >net. On R2, I have setup IBGP connection to R3.
> > > >I can see all routes from the BGP net in the routing table of R2, but
> > when I
> > > >try to ping the BGP Net, it doesn't work. Doing a trace, I find that
> the
> > > >packet gets dropped at R1 (subinterface that belongs to OSPF). I have
> > neighbor
> > > >x.x.x.x route-reflector-client configured on both routers.
> > > >
> > > >Is the above possible to get to work. ?? I can ping from R2 to R3,
but
> > not
> > > >from R2 to the BGP net. Any info is appreciated.
> > > >
> > > >thanks,
> > > >Sanjay
> > > >**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:31:51 GMT-3