PWHE for a L2VPN and L3VPN, a hierarchical approach without SDN
as you can see from the sketch, i've a MPLS Segment Routing core backbone (made of ASR9K as S_PE) and different islands instead composed of NCS540 as A_PE. The services that will be transported are the classic for an ISP, L2VPN and L3VPN.
Since the number of A_PE would be quite huge (they could reach the number of almost on thousand per single island) i decided to split the ISIS domain in L2 for the core and L1 for the islands (S_PE so will be working as L1/L2 edge router).
I don't need to introduce L2 into L1 leaking because, i just need the mgnt subnet to be reached by A_PE and vice versa, the A_PE's Lo again for the mgnt.
For the rest i would like to implement a hierarchical solution but without requiring the insertion of PCE (no Unified MPLS) and NSO, to make easier the whole solution.
So, finally my idea would be:
- L2VPN service: A_PE implement only BGP EVPN among them and with S_PE so that: PW VPWS EVPN can be set up among themselves for intra Domain L1 L2VPN service and L2 PWHE interface can be set on S_PE for inter Domain end2end L2VPN service
- L3VPN service: A_PE again, thanks to BGP EVPN set up also L3 PWHE interface on S_PE that end on a VRF and from there the L3VPN service is released by S_PE with BGP L3VPN among themselves
Now, my questions are:
1) For the L3VPN service, ok, it's quite clear, a PWHE ending on a VRF on S_PE and that's it, but for the L2VPN service, which would be the configuration on S_PE in order for them to collect L2 PWHE interfaces bound with L2 A_PEs' tunnels and at the same time tunnel them using BGP EVPN on the L2 ISIS core? i.e.: A_PE sets a L2 PWHE towards S_PE, S_PE take that L2 PWHE interface and xConnect with BGP EVPN configured on L2 core backbone to transport the L2 frames over the remote S_PE and again towards remote A_PE with another L2 PWHE... i don't find any configuration that shows me how it can be done
2) May i set a L2/L3 PWHE interface on S_PE that collect all the VLANs relatives to the clients connected to the same A_PE (so, only one PWHE tunnel per A_PE towards S_PE) and then spill the single L2/L3 sub-PWHE interface on S_PE?
If you have any suggestions, examples, docs i would be very grateful because i didn't find anything.
loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
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