Technical Documentation

Defining GMPLS Label-Switched Paths

Next, define LSP attributes at the [edit protocols mpls label-switched-path] hierarchy level. To enable the proper GMPLS switching parameters, configure the attributes appropriate for your network connection. The default values, which are also appropriate for standard MPLS, are ipv4 for gpid, none for signal-bandwidth, and psc-1 for switching-type.

Note: In JUNOS Release 5.6 and later, the signal-bandwidth statement replaces the signal-type statement. Also, virtual tributary (VT) 1.5 and 2.0 SONET/SDH bandwidth options are available at the [edit protocols mpls label-switched-path lsp-name lsp-attributes signal-bandwidth] hierarchy level.

[edit] protocols {mpls {label-switched-path lsp-name {from ip-address;to ip-address;primary path-name;secondary path-name;no-cspf; # This statement to disable CSPF is optional.lsp-attributes { # Attributes determine the selection of an LSP.gpid type;  # Payload type, such as Ethernet or PPP.signal-bandwidth type; # Bandwidth encoding, such as DS3 or STM1.switching-type type; # Switching method, such as psc-1 or lambda.}}}}

Note: Because MPLS and GMPLS use the same configuration hierarchy for LSPs, it is helpful to know which LSP attributes control LSP functionality. Standard MPLS packet-switched LSPs are unidirectional. GMPLS nonpacket LSPs are bidirectional.

If you use the default packet switching type of psc-1, your LSP becomes unidirectional. To enable a GMPLS bidirectional LSP, you must select a nonpacket switching type option, such as lambda or fiber, at the [edit mpls label-switched-path lsp-name lsp-attributes] hierarchy level.

Published: 2010-04-15