[c-nsp] General Question to OSPF

[A. Rahman Isnaini R Sutan]

Oliver,


It might be a bit out of topic.
The OSPF session will not up if the network set on IP secondary on the 
interface.
We should replace the primary with on of IP in the network to bring the OSPF 
to work out.

Not just like BGP/IBGP, as long as you can reach though it's set as 
secondary IP on interface so it should be Up.

Any expalantion from Cisco regarding this ?

Rgs,
a. Rahman Isnaini r. Sutan

----- Original Message ----- 
From: "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com>
To: <acm at netuse.de>; <cisco-nsp at puck.nether.net>
Sent: Sunday, March 19, 2006 4:37 PM
Subject: Re: [c-nsp] General Question to OSPF


> Ahmad Cheikh-Moussa <> wrote on Saturday, March 18, 2006 1:17 PM:
>
>> Hi!
>>
>> I made some thoughts about an ospf design.
>> I would like to know, what other people think about it.
>>
>> Here it is.
>> I have 4 cisco routers. All of them are connected together
>> in a ring topology. All connections have the
>> same bandwith/delay and so on.
>> The routers are connetcted via transfer networks
>> and all of them are in area 0.
>> Two of the four routers have uplinks to two BGP
>> routers. Both BGP routers are the default gateways
>> for the other 4 routers. The uplinks are
>> separated in two transfer networks in area 0.
>>
>> Is there something I should keep in mind, when I try
>> such a configuration  ?
>> What happens, when OSPF has several equal routes ?
>> routing loops ??
>
> Just enable OSPF as you described, and it will work. If you have
> equal-cost paths, OSPF will install multiple paths into the RIB and the
> router will load-share. There is no risk for loops if you let OSPF do
> all the routing.
> You do need to take a look at your iBGP topology, though. If you don't
> run BGP on all the transit routers, you could run into loops. But I miss
> more detailed info about the BGP topology in order to evaluate this.
>
> oli
>
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