nanog mailing list archives
Re: OSPF vs ISIS - Which do you prefer & why?
From: Mark Tinka <mark.tinka () seacom mu>
Date: Thu, 10 Nov 2016 16:33:27 +0200
On 10/Nov/16 12:17, James Bensley wrote:
I don't think there is much of a debate to be had any more, the gap between them is so small now (OSPFv3 and ISIS that is, no one would deploy OSPFv2 now in greenfield right?):
Most networks that I know are greenfielding an IGP will deploy both OSPFv2 and OSPFv3. Worst case, just OSPFv2.
This is in OSPv3.
Right, but if a network does not yet want to run IPv6 (2016, anyone), then this becomes an issue as IPv6 NLRI is carried over the IPv6 transport. This could also come down to implementation. I looked at this for the first time back in Junos 9.0 (when it was still an IETF draft), and no other vendor had it yet. It has since matured and I know both Juniper and Cisco have decent code. I can't speak for other vendors, particularly if you multi-vendor.
Single area 0 deployment at scale? Bit of a moot point unless you compare a specific device model and specific code version in two identical deployments, its not much to do with the protocol but the vendor implementation and the brute force.
Like I said to Randy, if I did deploy OSPF ever (quite unlikely), there is enough CPU in today's router to, I think, run a single Area 0 for the whole thing.
OSPv3 has this.
Yep, as I did mention.
OSPF has these too.
More of them in OSPFv3 than OSPFv2. But then again, vendor-specific knobs can be had here for cheap.
Yeah this ^ I don't think there is a stronge case for either protocol. Somenoe mentioned the AOL NANOG talk about migrating from OSPF to ISIS. There was a NANOG talk recently-ish about someone migrating from OSPF to BGP. There wasn't even a need for an IGP, BGP scalled better for them (in the DC). BGP these days supports PIC and BFD etc, how much longer to IGPs have? :)
Sounds like you're talking about BGP-LS. If you are, then BGP-LS still requires an IGP. It's just that the IGP has a much more micro view of the network, while BGP-LS is tasked with the macro side of things. Mark.
Current thread:
- Re: OSPF vs ISIS - Which do you prefer & why?, (continued)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Wayne Bouchard (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Randy Bush (Nov 10)
- Re: [SPAM] Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? James Bensley (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Zbyněk Pospíchal (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 10)
- Re: [SPAM] Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 11)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 09)
- Re: OSPF vs ISIS - Which do you prefer & why? Mikael Abrahamsson (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Nick Hilliard (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? sthaug (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Mark Tinka (Nov 10)
- Re: OSPF vs ISIS - Which do you prefer & why? Dragan Jovicic (Nov 11)