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Supported Platforms

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)
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
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