I know this topic has been discussed many times in forum and I could find useful information on specific hardware support in 7604.
However my requirement is bit strange (as it sounds to me). I have the below hardware:
As I gone through the forum, I understood the only constraint in 7604 with VPLS is that the core facing should be either SIP-400/SIP-600 with Gigi SPA, ES-10G and OSM.
1. But my problem now is I have SIP-400 with SPA-4XOC3-POS. Can this SPA be used on wan facing side for MPLS to work. To my understanding, core should only do label swapping and not mandatory that core facing should be Gigi. Though my typical core facing PE (NPEG1 now) side is only on Gigi, in this case of VPLS with 7604 I dont have Gigi and have to purchase so thought if SPA-4XOC3-POS works then atleast I go ahead and test VPLS. Procuring Gigi SPA will take some time due to business approvals.
2. If only Gigi SPA should be on the core facing side, then which Gigi SPA should be supported. Will 1 Gigi SPA support or I have to go for 10 Gigi SPA?