09-02-2018 02:15 AM
Hi Freinds
One of the UMPLS key is we able to extend MPLS (LSP) to the Access Network
My Question which confused me
in the Traditional MPLS don't we have LSP up to Access (PE) ,so where is he key Difference
thanks all
09-03-2018 03:01 AM
The key difference is that where in “classical” MPLS you used to have:
(“CE”)Mobile-Cell-router---L2-agg-SW--PE--MPLS--PE….
In Unified MPLS you’d have:
(“PE”)Mobile-Cell-router---P--ABR—H-MPLS--ABR….
In one to one comparison:
The mobile cell router is not a pure IP router anymore but it’s a small scale MPLS PE (ASR903/920/…)
The L2 aggregation switch is now an MPLS P router
The former PE is now Area Border Router and its role is stitching access MPLS areas into H-MPLS core in a “Hierarchical” fashion, so that the IGP/LDP on H-MPLS P routers doesn’t need to learn the loopbacks of all the 100,000s of (“PE”)Mobile-Cell-routers and P routers from all these access areas –as the IP reachability and label information for nodes in these IGP areas that are separated from H-MPLS core IGP is now carried in BGP-LU and only between ABRs creating this scalable MPLS hierarchy.
This hierarchical MPLS is a very old concept used for ages In Inter-AS MPLS VPNs option C deployments –that was somewhat shoehorned into single-AS or even single IGP(multi-area/level) deployments.
And solving problems with yet another layer of indirection is an ancient concept :)
adam
netconsultings.com
::carrier-class solutions for the telecommunications industry::
09-03-2018 08:26 AM - edited 09-03-2018 08:27 AM
Hello bro Adam
Thanks for ur reply , thanks also for the nice explanation , you earned my 5 pts :)
bro , do u have the initial config of the below Cisco DOC , if no pls guide me how can u get it
thanks
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