Link-Layer Support

MPLS supports the following link-layer protocols, which are all supported in the JUNOS MPLS implementation:

• PPP—Protocol ID 0x0281, NCP protocol ID 0x8281.
• Ethernet/Cisco HDLC—Ethernet type 0x8847.
• ATM—SNAP-encoded Ethernet type 0x8847. Support is included for both point-to-point mode or NBMA mode. Support is not included for encoding MPLS labels as part of ATM VPI/VCI.
• Frame Relay—SNAP-encoded, Ethernet type 0x8847. Support is not included for encoding MPLS labels as part of Frame Relay DLCI.
• GRE Tunnel—Ethernet type 0x8847.