Re: migration of ospf to ISIS

I did a POC for Service Provider OSPF->ISIS. ISIS Link State table is
significantly much smaller than OSPF.

It could be due to merger with another company who is already running
IS-IS and require to extend IGP or TE domain
for BGP peerings.

On Sat, Sep 26, 2009 at 1:39 AM, Nanda, Manoj (DS-1)
<Manoj.Nanda_at_drs-defensesolutions.com> wrote:
> Jack: Could you please share the reason why was the requirement to move
> from ospf to isis as part of the underlying igp ? As per my
> understanding isis can natively support ipv6 where as you have to
> configure ospv3 for the same.
> Thanks
> Manoj
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Rick Mur
> Sent: Friday, September 25, 2009 6:37 AM
> To: Iwan Hoogendoorn
> Cc: jack daniels; Cisco certification
> Subject: Re: migration of ospf to ISIS
>
> I agree with Iwan, as long as your hardware allows it. I also did a
> migration from OSPF to IS-IS, but enabling IS-IS next to OSPF. It did
> increase some CPU, but I guess an ISP should have enough powerful
> hardware
> to support this.
>
> --
>
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Sr. Support Engineer IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
> On Wed, Sep 23, 2009 at 11:30 AM, Iwan Hoogendoorn
> <iwan_at_ipexpert.com>wrote:
>
>> Hi Jack,
>>
>> I think the best way here is to set up a topology and do 2 tests on
> this...
>> - First configure OSPF on the topo
>> - Second configure ISIS on the topo
>>
>> Verify the differences in terms of CPU load and try to look at the
>> timers / routing table guess this will be the same ...
>>
>>
>> --
>> Regards,
>>
>> Iwan Hoogendoorn
>> CCIE #13084 (R&S / Security / SP)
>> Sr. Support Engineer IPexpert, Inc.
>> URL: http://www.IPexpert.com
>>
>>
>> On Wed, Sep 23, 2009 at 9:49 AM, jack daniels <jckdaniels12_at_gmail.com>
>> wrote:
>> > Hi all ,
>> >
>> > I have got a project for an ISP ( also LDP configured ) runnning
> OSPF to
>> > migrate to IS-IS.
>> > I was planning to runnn dual IGP , as ospf with AD 110 and ISIS with
> AD
>> 115
>> > , OSPF will always be preffered.
>> >
>> > I was planning the challenges for migration, below are the ones
> which I
>> > could think of , please give your inputs on WHAT CONSIDERATIONS TO
> KEEP
>> IN
>> > MIND BEFORE MIGRATION.
>> > Also request you to share some docs for migration of OSPF to
> ISIS<<<<<
>> >
>> > 1) MEMORY/CPU utilisation
>> > 2) no. of routes in routing table and database
>> > 3) harware of the cisco devices ( 7206/12K)
>> >
>> > Regards
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> >
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Received on Sun Sep 27 2009 - 10:24:41 ART