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)" <[email protected]> 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: [email protected] >[mailto:[email protected]] On Behalf Of ying-xiang >Sent: Monday, January 09, 2012 17:27 >To: [email protected] >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? >_______________________________________________ >cisco-nsp mailing list [email protected] >https://puck.nether.net/mailman/listinfo/cisco-nsp >archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
