RE: Multiple OSPF processes having same router-id ?

While we are on that subject, in case you were wondering, you can't
duplicate the ospf process ID either, even if it's in a vrf context...

R3(config)#router ospf 1 vrf test
OSPF process 1 already exists and is attached to Default-IP-Routing-Table

Aaron

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Billy Singh
Sent: Tuesday, February 17, 2015 6:18 AM
To: ccielab_at_groupstudy.com
Subject: Re: Multiple OSPF processes having same router-id ?

Not sure about "real-world" applications but I just knocked a quick config
up in a lab environment and was unable to manually configure the same OSPF
router-id across multiple OSPF processes (Global and VRF); the IOS parser
did prevent me from doing so:

R10(config-if)#router ospf 1 vrf CUST1
R10(config-router)#router-id 1.1.1.1
% OSPF: router-id 1.1.1.1 in use by ospf process 100 ...
*Feb 17 11:59:37.282: %OSPF-4-NORTRID: OSPF process 1 failed to allocate
unique router-id and cannot start ...
R10(config-router)#do sh ip os | i [Pp]rocess
  Routing Process "ospf 100" with ID 1.1.1.1
%OSPF: Router process 5 is not running, please configure a router-id
%OSPF: Router process 4 is not running, please configure a router-id
%OSPF: Router process 3 is not running, please configure a router-id
%OSPF: Router process 2 is not running, please configure a router-id
%OSPF: Router process 1 is not running, please configure a router-id

R10(config-router)#do sh ver | i IOS
Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version
15.4(2)T, DEVELOPMENT TEST SOFTWARE

What is your hardware platform and IOS version?

Billy

On 02/17/15 21:45, Rakesh M wrote:
> Hi,
>
> Within Cisco Routers, if we have multiple OSPF processes (running in
> global and as well at VRF level) , can we define same router-id for
> all these OSPF processes ?
>
> I tried assigning and i have not got any parser errors from the device
> nor there was an impact on Neighbor formation process ?
>
> Would there be any design Reason for this choice or for not to opt for
> this choice ?
>
> Thanks
> Rakesh Madupu
> JNCIE-SP #02079
>
>
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Received on Thu Feb 19 2015 - 06:41:50 ART