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Architecture Requirements S-PEs MAY only support switching PWs of the same PW type. The PWs MUST remain transparent to the P-routers. A P-router is not an S-PE or an U-PE from the MS-PW architecture viewpoint. The MS-PWs MUST use the same encapsulation modes specified for SS-PWs. S-PEs MAY change the type or encapsulation mode A MS-PW SHOULD be able to pass across PSNs of all technologies specified by PWE3 for SS-PWs. Both directions of a PW segment MUST terminate on the same S-PE/U-PE. |