ccamp-11----Page:4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
|
Layer 2 Label Space L2 labels representation (that can be supported over [X,L2SC], [L2SC,L2SC] and [L2SC,X] links) and assigned upon reception of the LSP Encoding and Switching Types: LSP Encoding type Switching Type Label ----------------- -------------- ----------------------------- Ethernet L2SC Port, VLAN ID ATM L2SC Port, VPI, VCI, VP Bundle ID Frame-Relay L2SC Port, DLCI Ethernet, ATM, Frame Relay Port labels are 32 bits values Ethernet VLAN ID labels are encoded with the VLAN ID value (12 bits) right justified in bits 20-31 (and preceding bits must be set to 0) ATM VPI/VCI labels are encoded per [RFC3036] Section 3.4.2.2. Frame-Relay DLCI label values are encoded per [RFC3036] Section 3.4.2.3. Note: Bi-directional L2 LSPs are indicated by the presence of an upstream label in the Path message |