From: Edmund Tham (EdmundT@xxxxxxxxxx)
Date: Mon Aug 06 2001 - 06:19:22 GMT-3
"ip unnumbered lo0" only works for Point-to-point (non-multi-access)
interfaces. What happen if I got an ethernet interface instead of serial
interface? I can't configured "ip unnmbered lo0" on an ethernet interface.
Any other way to set up the configurations if both the routers are connected
to a switch instead of a serial link as shown in the book.
Thanks
Edmund
-----Original Message-----
From: Groesbeck, Jeff [mailto:JGroesbeck@NECBNS.com]
Sent: Saturday, July 28, 2001 4:02 AM
To: 'ccielab@groupstudy.com'
Subject: RE: BGP example in Doyle volume 2
Just did this myself...
If you use "ip unnumbered lo0" on your serial interfaces, your static
entries will show up in the routing table and the bgp neighbor relationship
will form.
(Substitute lo0 for whatever loopback interface you are using with those
addresses)
Jeff
-----Original Message-----
From: Xu, James
To: 'Sam Pilot'; Tim O'Brien
Cc: CCIELab
Sent: 7/27/01 12:54 PM
Subject: RE: BGP example in Doyle volume 2
Sam:
>From the error message "unroutable" that you get. I don't think you have
valid static route in your routing table. Check the following two
things:
1). replace the loopback address from 172.30.255.254 to 172.30.254.254.
(I
don't think you can use x.x.255.x as valid ip addresses).
If still not resolve issue, then
2). check the encapsulation type for your serial interface. If the enc
type
is "frame-relay", you need change your static routes in both routers by
specifying the next-hop address as the ip address of the other end, so
they
become "ip route 10.100.83.1 255.255.255.255 x.x.x.x". Due to the nature
of
NBMA network, you cann't use interface as your next-hop.
James Xu
-----Original Message-----
From: Sam Pilot [mailto:sam_pilot@hotmail.com]
Sent: Thursday, July 26, 2001 7:46 AM
To: Tim O'Brien
Cc: CCIELab
Subject: Re: BGP example in Doyle volume 2
Tim
these two neighbours are EBGP neighbours. Just two routers connected by
a
serial link.
This is the config that is suggested in the book.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Zermatt
interface Loopback0
ip address 172.30.255.254 255.255.255.255
router bgp 30
neighbor 10.100.83.1 remote-as 100
neighbor 10.100.83.1 ebgp-multihop 2
neighbor 10.100.83.1 update-source Loopback0
no auto-summary
!
ip classless
ip route 10.100.83.1 255.255.255.255 Serial0
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Innsbrook
interface Loopback0
ip address 10.100.83.1 255.255.255.255
no ip directed-broadcast
router bgp 100
bgp log-neighbor-changes
neighbor 172.30.255.254 remote-as 30
neighbor 172.30.255.254 ebgp-multihop 2
neighbor 172.30.255.254 update-source Loopback0
!
ip classless
ip route 172.30.255.254 255.255.255.255 Serial0
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Any suggestions?
Thanks
Sam
----- Original Message -----
From: "Tim O'Brien" <tobrien@cinci.rr.com>
To: "Sam Pilot" <sam_pilot@hotmail.com>
Sent: Thursday, July 26, 2001 4:30 AM
Subject: Re: BGP example in Doyle volume 2
> Are you setting up iBGP? Do you need Next hop self? You also may need
the
> "neighbor x.x.x.x update-source loopback0" command
>
> Tim
>
>
> ----- Original Message -----
> From: "Sam Pilot" <sam_pilot@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, July 26, 2001 12:26 AM
> Subject: BGP example in Doyle volume 2
>
>
> Hi everyone
>
> I am trying to simulate the example in Jeff Doyle Vol 2 page 212.
> He shows the routers Innsbruck and Zermatt by serial
links
> with
> no IP addresses defined.
>
> And he has static routes to the loopbacks of the neighbor routers
pointing
> to
> the serial interfaces.
> BGP neighbors are defined to the loopback IP's
>
> However when I try to set it up it, the BGP neighbor relationship is
not
> formed.
>
> I tried doing an extended ping to the remote router loopback with a
source
> IP
> of the loopback of the router. but am getting "Unroutable" when I do a
debug
> ip packet.
>
> Can someone who has this book and who has tried out this scenario
explain
> how
> to get this working.
>
> If I set up IP addresses to the serial links, then the BGP neighbor
> relationship gets formed.
>
> Thanks
>
> Sam
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