From: Sadiq Yakasai (sadiqtanko@gmail.com)
Date: Fri Jun 29 2007 - 10:24:11 ART
Hi Jason,
Mike suggested putting on the mask on the network backdoor command,
and it worked. All the text i found on the subject didnt use the mask
and why it refused to work in the first instance.
Sadiq
On 6/29/07, Jason Guy (jguy) <jguy@cisco.com> wrote:
> The route should be in RIP as well. The purpose of bgp backdoor is due
> to the fact that a route learned via eBGP has an admin of 20. This is
> far superior to that of any IGP.
>
> So to reach R5 from R4 it is silly to traverse the BGP cloud, when a
> perfectly good way to reach R5 is via RIP. But the route needs to be in
> the IGP for any sort of traffic to actually take the backdoor path.
>
> Jason
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Mike Kraus (mikraus)
> > Sent: Thursday, June 28, 2007 6:11 PM
> > To: Sadiq Yakasai; Cisco certification
> > Subject: RE: BGP Backdoor Routing issue
> >
> > What if you add the mask to your network statement? (network
> 150.1.4.0
> > mask 255.255.255.0 backdoor)
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Sadiq Yakasai
> > Sent: Thursday, June 28, 2007 4:37 PM
> > To: Cisco certification
> > Subject: BGP Backdoor Routing issue
> >
> > hi Guys,
> >
> > Can someone help out here please? See setup below:
> >
> > (150.1.4.4)
> > lo0
> > | rip (155.1.45.0)
> > R4 ------------------------------------------------- R5
> > | |
> > | |
> > |ebgp |ebgp
> > | |
> > |---------------------R3 -----------------------------|
> >
> >
> > R4 is advertising lo0 (150.1.4.0) into bgp to R5 (via R3, who is an
> ebgp
> > peer to R4 as well)
> > R4 is doing rip on the link to R5
> >
> > R5 is receiving the same route from both protocols (bgp & rip). I have
> > confirmed this as you will see later on.
> >
> > I issue the network 150.1.4.0 backdoor command on R5, but it doesnt
> > install the 150.1.4.0 route in the IP routing table as an rip route
> > (which is the reason for the backdoor routing in the first place place
> i
> > presume).
> >
> > Pls is there anything i am not getting right here? I have read all the
> > text on it that I can find (Routing TCP/IP vol 2, Internet Routing
> > Architecture, BGP Command and Config Handbook, CCO) but to no avail.
> >
> > Now i am getting frustrated! I need help! :-)
> >
> >
> > R5:
> > R5#sh run | b router bgp
> > router bgp 5
> > no synchronization
> > bgp log-neighbor-changes
> > network 150.1.4.0 backdoor
> > neighbor 155.1.0.1 remote-as 1
> > no auto-summary
> > !
> > router rip
> > version 2
> > network 155.1.0.0
> > no auto-summary
> > R5#
> > R5#sh ip rout | inc 150.1.4
> > B 150.1.4.0 [20/0] via 155.1.0.1, 00:30:05 <---------at this
> > point, the bgp route is on the ip routing table
> >
> > R5#conf t
> > R5(config)#router bgp 5
> > R5(config-router)#no neighbor 155.1.0.1 remote-as 1
> >
> > R5(config-router)# do clear ip rout *
> > R5(config-router)#do sh ip rout
> > R 150.1.4.0 [120/1] via 155.1.45.4, 00:00:03, Serial0/3/0
> > <--------- i clear the bgp neigb and the rip route makes it
> >
> > to the routing table
> >
> > R5(config-router)#neighbor 155.1.0.1 remote-as 1 <--------- i
> > restore the bgp neig and it reverts!
> > R5(config-router)# do clear ip rout *
> > *Jun 28 21:28:14.277: %BGP-5-ADJCHANGE: neighbor 155.1.0.1 Up
> > R5(config-router)# do clear ip rout * R5(config-router)#do sh ip rout
> > B 150.1.4.0 [20/0] via 155.1.0.1, 00:00:03
> >
> >
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