On Thu, Apr 8, 2010 at 11:21, Cristian Nedelcu <[email protected]> wrote: > i don't understand verry well this part.. so..check out the output from > attachment > my questions are : > 1) when the packet come with label 23, is swapped with label 20..then label > 16 is pushed onto 20 but in LFIB only the top label is showed? > 2) Tag Stack{20 16} .. label 20 will be on top of IP header,BoS set to 1? > so here the frame will look like this : [L3][20,16][L2] ?
In order to fully answer this, some more context would be nice. Just by looking at this output, I would say this is MPLE TE environment (I'd venture a guess that it could even be FRR recovery in action), with 16 being the tunnel label and 20 the actual label applied for the tail-end. The prefix is switched using tunnel label, but tunnel is not a physical interface. When the packet gets to the wire, it needs to have a "real" label, hence additional label on the stack. -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert YES! We include 400 hours of REAL rack time with our Blended Learning Solution! Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
