| 摘要 |
Disclosed is a method for differentiating pseudowire (PW) packets from multi-protocol label switching (MPLS) packets. It uses particular time-to-live (TTL) values to differentiate PW packets from MPLS packets, thereby to create additional label spaces and to maximize the total number of PWs and label switching paths that can be simultaneously in use. At an ingress PW device, when an incoming packet is encapsulated into a PW packet, the TTL field of the corresponding PW header is set to one of particular values. At an egress MPLS device, after a packet is received, the value of the TTL field of its MPLS header is compared with these particular values. If the TTL value is equal to one of particular values, this packet is a PW packet and belongs to the PW label space of the particular value.
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