From: Marko Milivojevic (markom@markom.info)
Date: Fri Dec 12 2008 - 09:59:17 ARST
On Fri, Dec 12, 2008 at 09:40, John Edom <jedom123@gmail.com> wrote:
> Q1- In BGP, we use next-hop-self command when other IBGP neighbours don't
> have route to that next hop router. for example
>
> R2--------------IBGP-----------------R1----------------EBGP--------------R3
> AS 10 12.1.1.0/23 AS10 13.1.1.0/24 AS30
>
> In this scenario, of R2 doesn't have route to 13.1.1.0 then we use
> next-hop-self on R1 but lets suppose we are running any IGP and R2 has route
> to 13.1.1.0 network then do we still need to put next-hop-self command?
In that case, you would not need it, unless you are in SP lab. If you
are in SP lab, you may need it.
> Q4 - Regarding IGP router-id, should we configure router-id by our own or
> only if exam will ask? And are normally they say "Configure router-id on all
> ospf routers" or like "don't configure router-id on this this router".
It depends. There are several things that are not obvious, but can
cause disaster in your network. One thing that comes to mind is
anycast RP. If Loopback used for this has higher IP address than your
route-id's and you don't set router-id's manually, you will end-up
having multiple routers with the same router-id after the reload.
> Q5- BGP Peering, In IBGP peering we should configure all peer based on
> loopback or only if they ask or we have too think where we need direct
> peering and where need based on loopback with update-source command??
General practice and the one I would follow in the lab is to establish
iBGP using Loopback interfaces.
-- Marko CCIE #18427 (SP) My network blog: http://cisco.markom.info/Blogs and organic groups at http://www.ccie.net
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