From: Ben (bmunyao@gmail.com)
Date: Fri Jun 29 2007 - 12:02:30 ART
Sadiq,
Sorry i didn't notice the attached config was from R5, not R4. My mistake.
Ben
On 6/29/07, Sadiq Yakasai <sadiqtanko@gmail.com> wrote:
>
> Ben,
>
> If you refer back to the topology there for a sec again please. The
> recipient router is actually R5 not R4.
>
> The route (150.1.4.0) was advertised from R4 (both into eBGP and RIP).
> Hence, R5 only learnt the route and why we need not to include it
> locally into RIP. I have excluded R4's config there, cos I feel its
> not relevant.
>
> Thanks
>
> Sadiq
>
> On 6/29/07, Ben <bmunyao@gmail.com> wrote:
> > Sadiq
> > I'm not sure how you got it to work without first adding it to RIP
> config on
> > R5 (network 150.1.0.0) as Jason mentioned. The backdoor feature requires
> the
> > IGP and eBGP routes to be on the recipient router (R4), for it to work.
> >
> > Ben
> >
> >
> >
> >
> > On 6/29/07, Sadiq Yakasai <sadiqtanko@gmail.com> wrote:
> > > 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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