 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
LDP signaling information for VPLS is carried in a label mapping message. The label mapping message contains the Generic Label type-length-value (TLV), and the pseudowire identifier (PWid) forwarding equivalence class (FEC) element. A FEC is a group of IP packets forwarded over the same path with the same path attributes applied.
The PWid FEC element (FEC Type 128 or 0x80) contains the VPLS identifier information configured for your VPLS instance with the mpls ldp vpls-id command. Taken together, the pseudowire type field and the PWid field in the TLV represent a unique VPLS instance. The pseudowire type field is Ethernet to identify the pseudowires that carry Ethernet traffic for multipoint connectivity between the local and remote VEs. The PWid field is a nonzero 32-bit integer that contains the VPLS identifier, which is a globally unique identifier for a VPLS domain. All VEs that participate in the same VPLS domain must use the same VPLS identifier.
Martini encapsulation for Ethernet layer 2 services over MPLS also uses the PWid FEC Element TLV. As a result, the PWid for Martini configurations must not be the same as the VPLS identifier configured for a VPLS instance. To prevent this conflict from occurring, the JUNOSe software displays an error and rejects the configuration if you attempt to configure the same value for the Martini PWid and the VPLS identifier.
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |