Supported Layer 2 Circuit Standards

The Junos OS substantially supports the following RFCs, which define standards for Layer 2 circuits.

• RFC 4447, Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)

  The Junos OS does not support Section 5.3, “The Generalized PWid FEC Element.”

• RFC 4448, Encapsulation Methods for Transport of Ethernet over MPLS Networks

The following Internet drafts do not define standards, but provide information about Layer 2 technologies. The IETF classifies them as “Historic.”

• Internet draft draft-martini-l2circuit-encap-mpls-11.txt, Encapsulation Methods for Transport of Layer 2 Frames Over IP and MPLS Networks

  The Junos OS differs from the Internet draft in the following ways:

  • A packet with a sequence number of 0 (zero) is treated as out of sequence.
  • Any packet that does not have the next incremental sequence number is considered out of sequence.
  • When out-of-sequence packets arrive, the expected sequence number for the neighbor is set to the sequence number in the Layer 2 circuit control word.
• Internet draft draft-martini-l2circuit-trans-mpls-19.txt, Transport of Layer 2 Frames Over MPLS

Related Topics

• Supported Carrier-of-Carriers and Interprovider VPN Standards
• Supported Layer 2 VPN Standard
• Supported Layer 3 VPN Standards
• Supported Multicast VPN Standards
• Supported VPLS Standards
• Accessing Standards Documents on the Internet