I already thought about L2 problem and what I meant is to interconnect PE as via L3. In this case PE should speak with each other only L3: IGP and BGP and they should exchage the Lables for VPN and TE services. that is why we'd like to user MPLS "L4 switch"
The problem with "P" routers in our case is following, we have, let say, 6 big sites which are interconnected in ring topology and a number of satelate sites which are somehow connected to those "hub" sites. But we can't place in all those 6 site the additional HW (ther are some cost, place and "security" factors). We have only 3 site where we could place "P" routers, but those 3 sites are not directly connected.
regarding HW you're right, we should check it out.
From the begining we planed to use c7200 as PE router together with c3560 to aggregate to links on it. I think c7200 (NPE-G2) would be quite good in this role.
But then we met with Cisco consultant and he said that in near future will come a new Metro switch like ME3600 or something , with full MPLS features and it could replace c7200+c3560 and fit there very well .
But... as usual switches have quite limited space for IPv4/Ipv6 route table and if some end-users would like to get the Full-BGP table, I don't think that those ME3600 switches can handle it.
we're planning to stay at a sub-gigabit speed for a while, that is why we planed to put NPE-2G at forwarding plane as well. When we see that the performance on some sites reachs a limit then we can replace them with a ASR1000 and use NPE-G2 as BGP router-reflectors for example.
Another possibility is to put c7200 as P router at the core, and use ME3600 (those new switches) as PE router, and for the customer which needs full bgp just give the multihop eBGP session to the Internet gateway router.
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