Re: [bess] FW: WG Last Call (including implem status & shepherd) for draft-ietf-bess-evpn-vpws-03

["Jeffrey (Zhaohui) Zhang" <[e-mail]>]

Hi Sami,

I thought about this BW topic further, and have the following question:

- Even for the originally stated purpose, i.e. for PE1 to request PE2 to request BW reservation in the network, why does it have to be signaled from PE1? Why can’t you provision PE2 to request that BW reservation? You need to provision service identifier on both PE1 and PE2 anyway, so you might as well add BW provisioning on PE2.



I understand that draft-boutros-bess-evpn-vpws-service-edge-gateway-02 does specify that the service node could skip the service identifier configuration and automatically signals the one that it receives from the access node. In that case, signaling qos/bw parameters from the access node makes sense (in that there is no need for configuration on the service node side).



So, perhaps the entire BW or shaping signaling stuff could be moved from the base EVPN-VPWS draft to draft-boutros-bess-evpn-vpws-service-edge-gateway?



Jeffrey

Sami: The issue here is that we are using the BW idr draft, and there is no shaping defined there, and we don’t plan to define a new attribute for this, perhaps we can add that to a new draft?
 Zzh2> Good point that BW is not equal to shaping parameters; however, existing PW specifications do not seem to have BW related stuff and one actual customer use case I am aware of with EVPN VPWS actually does involve shaping; so maybe it’s better to take care of this in the base spec? It’s just a new attribute anyway.