I'm trying to find a way to aggregate the PE routers to a P router. I've read somewhere that this could be done by putting a LAN switch in the middle and run dot1q trunk to the P router. This would cause the PE to PE traffic on the same switch to hair-pin. Is there a better way to do this?
you can also use a single Vlan and a single IP subnet:
a 10 GE uplink on the L2 switch to the P router and a GE link on each PE and you can aggregate up to 10 PE without oversubscribing in this case PE to PE communication is direct without going through the P router.
MPLS is supported in a LAN environment you are not constrained to point-to-point links.
Be aware that the L2 switch requires specific configuration to deal with MPLS MTU issues.
thanks again. Is the implicit-null treated as a label, basically, do I need to add 4 addtional btyes for the implicit null to the MTU? Is there a terminology for this type of setup? I tried to find some docs on this but all I find are P-PE examples and no P-switch-PEs.
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