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Vito_Corleone
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 12:17 pm 
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Sepiraph wrote:
Yes you can use a OSPF-based DMVPN, but it wouldn't scale as well as a EIGPP-based DMVPN.


I disagree. Why do you say that?

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Phenom01
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 12:27 pm 
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ristau5741 wrote:
Phenom01 wrote:
The book i'm reading says that when using the command "router ospf <1 - 65535> the process-ID is meaningless. What gives? If it's meaningless, then why is it there?



process id differentiates between OSPF processes, if you were running multiple instances of OSPF, how could the routers tell the difference to which instance they belong?

Why would you want to run more than one instance?
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mellowd
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 12:56 pm 
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Phenom01 wrote:
ristau5741 wrote:
Phenom01 wrote:
The book i'm reading says that when using the command "router ospf <1 - 65535> the process-ID is meaningless. What gives? If it's meaningless, then why is it there?



process id differentiates between OSPF processes, if you were running multiple instances of OSPF, how could the routers tell the difference to which instance they belong?

Why would you want to run more than one instance?


Many reasons. One of the primary reasons is when you're running vrfs and each vrf needs it's own OSPF process

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burnyd
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 3:41 pm 
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eigrp in 90% of our datacenters.

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Sepiraph
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 3:49 pm 
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Vito_Corleone wrote:
Sepiraph wrote:
Yes you can use a OSPF-based DMVPN, but it wouldn't scale as well as a EIGPP-based DMVPN.


I disagree. Why do you say that?


From the Cisco DMVPN Design doc, they quoted 400 neighbors for EIGRP while 50 for OSPF, they made indirect reference to the more computational-intensive nature of OSPF + additional overhead of encryption and NHRP:

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/DMVPN_2_Phase2.html#wp38089

Also Ivan made some comment here, specifically:

Quote:
All spokes have to be in the same area as they are connected to the same subnet (which is why OSPF over DMVPN does not scale) and thus they get all intra-area information.

The only trick you could use would be flood filters on the hub http://wiki.nil.com/OSPF_flooding_filte ... nvironment but then you need static default routes on the spokes. OK if you have a non-redundant setup, "slightly" harder if you need redundancy.

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Vito_Corleone
 Post subject: Re: Question about EIGRP
PostPosted: Fri May 25, 2012 7:30 pm 
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Hmm, that makes some sense. I'm surprised about the highness of the EIGRP number, as well as how low the ospf number is.

Sent from my PG86100 using Tapatalk 2

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ciscodisco
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:03 pm 
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Hello, You are always best to keep it simple why use 2 protocols when 1 will work? EIGRP is kind of the better protocol but it’s not vendor neutral which could lead to some serious costs if you stop using Cisco equipment. For this reason OSPF is usually the preferred choice.

However EIGRP does have advantages. For example; if you are using AppleTalk or IPX because OSPF doesn’t support these as they are both legacy protocols. In fact does anybody still use these? Also OSPF requires a hierarchal network so you may choose to use both in the transition to OSPF or a new network upgrade.

:woohoo: My first post lol


Last edited by ciscodisco on Mon May 28, 2012 12:27 pm, edited 1 time in total.

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mellowd
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:10 pm 
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Kind of the better protocol?

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ciscodisco
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:15 pm 
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mellowd wrote:
Kind of the better protocol?


I knew someone would pick me up on that lol: Faster Convergence, simpler configuration, route summarisation at none area boundaries. etc.
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mellowd
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:24 pm 
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I still think OSPF is far better

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Steven King
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:39 pm 
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Mellow is the fact that EIGRP is Cisco-proprietary your only gripe with it?

Personally, I don't have the experience to say the benefits of one over the other, but from my studies so far, I'd go EIGRP if I was a Cisco shop. Maybe the glaring benefits of OSPF haven't really jumped out at me beyond multi-vendor support, which is something else I wouldn't want to have to deal with. I'd rather call one vendor for purchasing/support.

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mellowd
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:43 pm 
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Not just.

I'll let Doyle do the talking: http://www.networkworld.com/community/node/16276

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Steven King
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:50 pm 
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Darn you for making me read. Thanks though; I've been looking for good info in regards to EIGRP vs. OSPF.

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Steven King
 Post subject: Re: Question about EIGRP
PostPosted: Mon May 28, 2012 12:53 pm 
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Quote:
But then when your network grows large enough to need some scaling limits, forcing you to finally think about your topology, untangling EIGRP can be daunting. That’s when many operators call a consultant like me, who is happy to come in and implement an EIGRP to OSPF migration project for lots and lots of money. So in that mercenary way I’m quite fond of the protocol.


Lol win. :lol:

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that1guy15
 Post subject: Re: Question about EIGRP
PostPosted: Tue May 29, 2012 8:31 am 
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mellowd wrote:
Not just.

I'll let Doyle do the talking: http://www.networkworld.com/community/node/16276

Thanks for the link! I havent seen this post in quite some time.

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Sepiraph
 Post subject: Re: Question about EIGRP
PostPosted: Thu Jun 21, 2012 12:02 am 
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mellowd wrote:
Not just.

I'll let Doyle do the talking: http://www.networkworld.com/community/node/16276


I read that article years ago, but with all the recent developments around ISIS, it is no longer a question of EIGRP versus OSPF, ISIS is back into the picture and no longer just limited to large Service Provider.

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mellowd
 Post subject: Re: Question about EIGRP
PostPosted: Thu Jun 21, 2012 2:32 am 
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Indeed. And IS-IS will route both v4 and v6 right now (as can OSPFv3 on JUNOS with address families)

But IS-IS gives you authentication without needing that damn crypto license!

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