[c-nsp] PBB-EVPN

[Adam Vitkovsky]

> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Ivan Walker
>
> I have been looking into PBB-EVPN and would be interested in hearing
> experience from others.
>
> As far as I have understood there are two real benefits:
> 1) PBB / MAC in MAC reduces the load on BGP as BGP only needs to worry
> about the B-MACs
Yes that's the main benefit which also results in faster convergence although one might argue that if BGP PIC is used the BGP convergence is a moot point.
There's one more benefit though and that is data-plane based C-MAC learning -which facilitates faster VM moves.

> 2) Per-flow redundancy and load balancing
>
> Is it correct that the only way to connect  a CE device to 2 PEs for all
> active per-flow redundancy is via LACP?
Yes because standard STP would not allow for two active links carrying same VLANs (loop)
So in order to achieve this you'd need to deploy some of the L2 multi-pathing technologies in the MHD/MHS.
But I haven’t thought much about this so I can't fully appreciate all the requirements for interworking between the L2 multi-path protocol and PBB-EVPN PE. I guess the PEs would have to become part of the topology for multi-pathing to work between MHSs across EVPN. (well so much for not running IGP with CEs :) )


adam


        Adam Vitkovsky
        IP Engineer

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