Preserving Point-to-Multipoint LSP Functioning with Different JUNOS Software Releases

In JUNOS Release 9.1 and earlier, Resv messages that include the S2L_SUB_LSP object are rejected by default. In JUNOS Release 9.2 and later, such messages are accepted by default. To ensure proper functioning of point-to-multipoint LSPs in a network that includes both devices running JUNOS Release 9.1 and earlier and devices running JUNOS 9.2 and later, you must include the no-p2mp-sublsp statement in the configuration of the devices running JUNOS 9.2 and later: