Layer 2 Circuit Standards

The Junos OS substantially supports the following Layer 2 circuit standards:

• RFC 4447, Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP) (except section 5.3)
• RFC 4448, Encapsulation Methods for Transport of Ethernet over MPLS Networks
• Internet draft draft-martini-l2circuit-encap-mpls-11.txt, Encapsulation Methods for Transport of Layer 2 Frames Over IP and MPLS Networks (expires August 2006)

The Junos OS has the following exceptions:

• A packet with a sequence number of 0 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 (expires September 2006).

These drafts are available on the IETF website at http://www.ietf.org/.