[c-nsp] Maximum number of OSPF instances in aVRF-liteenvironment

[Oliver Boehmer (oboehmer)]

Timothy Arnold <mailto:timothy.arnold at uksolutions.co.uk> wrote on
Thursday, October 09, 2008 3:54 PM:

> Slightly off the topic.
> 
> Is there any advantages for using OSPF for PE-CE routing? Or is it
> down to what the customer wants? I assume that most operators will
> use BGP (or maybe EIGRP?)  

I guess most prefer eBGP due to it's scalability and level of control,
but at the end it's the customer's requirements (or the product
marketing's requirements) which dictate that.. 

Another aspect is the fact that many (most?) PE-CE links actually
terminate on a managed CE (managed by the same entity as the PE), so the
protocol between the two is up to the MPLS provider's discretion (and
most often ends up being eBGP). The CE then can redistribute BGP into
the customer's IGP (whatever it uses) without all the scalability issues
you need to consider on a PE possibly hosting hundreds or more PE-CE
links..

	oli


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mark Tinka 
> Sent: 09 October 2008 08:19
> To: Oliver Boehmer (oboehmer)
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Maximum number of OSPF instances in a
> VRF-liteenvironment 
> 
> On Wednesday 08 October 2008 17:12:07 Oliver Boehmer
> (oboehmer) wrote:
> 
>> right, this got changed in 12.3(4)T, 12.0(27)S,
>> 12.2(25)S, 12.2(18)SXE and others where IOS no longer
>> allocates a PDB per OSPF vrf instance, so you are not
>> limited by the 32 PDB instances any longer..
> 
> Great news!
> 
> We focus mostly on l2vpn's, but it's good to know this
> limitation no longer exists if we do get customers
> insistent on OSPF for a PE-CE routing protocol.
> 
> I recall IS-IS had the same issue in IOS. Do the new train
> revisions also include this fix?
> 
> We are on SRC1 (moving to SRC2).
> 
> Cheers,
> 
> Mark.
> 
> 
> Timothy Arnold
> Senior Engineer, Network & Security Group, UKSolutions
> 
> Telephone: 0845 004 1333, option 2
> Email: timothy.arnold at uksolutions.co.uk
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