RE: MPLS IGP Question

MPLS TE can also be supported without the need for link state protocols (OSPF or IS-IS) in the core with Verbatim Path Support. This feature is generally targeted at Enterprise networks that don't run OSPF/IS-IS in the core (e.g. EIGRP networks), but still run MPLS and want TE capabilities. See http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fsvbmlsp.html for more info on this.

In general any protocol will work for label allocation, but like Narbik mentioned, OSPF and IS-IS are used in the SP core because they have native extensions for MPLS TE.

HTH,

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com
 
Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Narbik Kocharians
Sent: Wednesday, September 08, 2010 10:32 PM
To: Marcin Zgola
Cc: Jack Router; ccielab_at_groupstudy.com
Subject: Re: MPLS IGP Question

Any routing protocol will work but link state routing protocols are much
better because of TE support.

On Thu, Sep 9, 2010 at 2:30 PM, Marcin Zgola <MZgola_at_netrixllc.com> wrote:

> thanks guys
>
> Marcin Zgola
> Internetwork Lead
> CCIE #18676
> Netrix, LLC
> http://www.netrixllc.com
> Ph. 847-964-5300
> Fax.: 847-964-5350
>
>
>
> -----Original Message-----
> From: Jack Router [mailto:pan.router_at_gmail.com]
> Sent: Wednesday, September 08, 2010 11:10 PM
> To: Marcin Zgola; ccielab_at_groupstudy.com
> Subject: RE: MPLS IGP Question
>
> Actually you can with statics in the core. I just took a working L3 VPN
> lab,
> replaced ospf with statics and all works as before: ping CE to CE works OK
> over L3 VPN. I have ospf between PE and CE. So I guess statics are only not
> very practical but technically doable.
>
> I did not test other IGPs in the core but I can see issues from command
> line
> perspective. Currently only OSPF gives the possibility to run completely
> independent instances:
> "router ospf X" for the core connectivity
> "router ospf Y vrf Z" for PE-CE connectivity.
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Marcin Zgola
> Sent: 8-Sep-10 21:48
> To: ccielab_at_groupstudy.com
> Subject: MPLS IGP Question
>
> Why do I need to run OSPF to exchange labels between LDP neighbors.
>
> Why can't I use static routes or iBGP?
>
> Thanks
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
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