[c-nsp] Reply:RE: why vpls need some special line cards to support

[ying-xiang]

Hi Arie,


EoMPLS dosen't need to perform MAC learning or MAC look up for forwarding packets.so EoMPLS function can be implement even without a advanced egress line card.is that right?!


Thanks a lot!



At 2012-01-10 03:28:07,"Arie Vayner (avayner)" <avayner at cisco.com> wrote:
>In VPLS, we need to be able to perform two actions:
>- L2 forwarding based on MAC (consider there could be local switching,
>need to perform MAC learning, flooding etc)
>- Label imposition
>
>Older PFC (forwarding engine on 6500/7600) cannot perform both actions
>in the same hardware, so another resource is required.
>PFC would perform the L2 forwarding functions (like a regular L2 switch
>would do), and the egress linecard would perform the label imposition.
>
>Regular LAN linecards do not have forwarding capacity on them (even if
>they have a DFC), and would require a more advanced line card.
>These are the different SIP modules or more recently ES20 and ES+
>modules (now also supported on 6500...)
>
>On 6500, SUP2T can also do VPLS natively, because the new PFC (PFC4) can
>do all the processing on its own.
>
>Arie
>
>-----Original Message-----
>From: cisco-nsp-bounces at puck.nether.net
>[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of ying-xiang
>Sent: Monday, January 09, 2012 17:27
>To: cisco-nsp at puck.nether.net
>Subject: [c-nsp] why vpls need some special line cards to support
>
>i have been confused by this question for a long time and i have been
>looking up some stuff from CCO.but still can not find the answer.what's
>the difference between when a router need to  handle encapsulation of
>L3VPN and L2vpn?anyone who could give the point?
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