The MPLS-OPS Archive

["Roger Williams" <rogwilli@cisco.com>]

Muhammad, you will find stacked labels for 1) the local hop, 2) the VPN, and
3) the tunnel "local hop". Consider that the tunnel becomes part of the
route to the destination. You think of the tunnel as a single local hop. S0
both it and the local hops need labels

Roger Williams 

-----Original Message-----
From: Muhammad Tahir [mailto:muhammadtahir2000@yahoo.com] 
Sent: Monday, February 07, 2005 8:45 AM
To: mpls-ops@mplsrc.com
Subject: Re: [MPLS-OPS]: MPLS Hierarchy

According to figure: (what I understand is)

There will be only TWO labels in a label stack at one time, one for IGP: to
travel the packet within the domain and the second for BGP label at the
boundary of the domain to transfer the packet towards next domain. 

(BUT, according to RFC 3031(section 3.27.3), if there are two or more
tunnels in ONE domain, then there will be 3 or more labels in one label
stack at the inner most tunnel.)

so for me this is a little bit confusing!!!!

Tahir



--- Puddinhead Wilson <puddinghead_wilson007@yahoo.co.uk> wrote:

>  
> > Hi,
> > please clear the situation:
> > 
> > reference:(framework for mpls, draft, page 51)
> >
> http://www.ietf.org/internet-drafts/draft-ietf-mpls-framework-05.txt
> > 
> > 1:
> > Is it necessary that we MUST make level only at IGP(OSPF etc) and 
> > BGP based?
> > It means that there will be ONLY two levels in each domain???
> 
> If you just run BGP all over, there is just one level
> :)
> 
> 
> > If yes, then there will be only two labels in each domain (at 
> > maximum) one is OSPF label and other will be BGP label??
> 
> What BGP label are you referring to?
> 
> 
> 
> 
> 
> 	
> 	
> 		
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