Table 7: Rsvp Lsp Role As Outcome Of Lsp Level And Igp Level Configuration Options - Alcatel-Lucent 7450 Manual

Ethernet service switch

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RSVP-TE LSP Shortcut for IGP Resolution

ure>router>mpls>lsp>to, corresponds to a router-id of a remote node. RSVP LSPs with a

destination corresponding to an interface address or any other loopback interface address of a

remote node are automatically not considered by IS-IS or OSPF. The user can, however, exclude a

specific RSVP LSP from being used as a shortcut for resolving IGP routes by entering the

It is specifically recommended to disable igp-shortcut option on RSVP LSP which has the cspf

option disabled unless the full explicit path of the LSP is provided in the path definition. MPLS

tracks in RTM the destination or the first loose-hop in the path of a non CSPF LSP and as such this

can cause bouncing when used within IGP shortcuts.The SPF in OSPF or IS-IS will only use

RSVP LSPs as forwarding adjacencies, IGP shortcuts, or as endpoints for LDP-over-RSVP. These

applications of RSVP LSPs are mutually exclusive at the IGP instance level. If the user enabled

two or more options in the same IGP instance, then forwarding adjacency takes precedence over

the shortcut application that takes precedence over the LDP-over-RSVP application.

Table 7: RSVP LSP Role As Outcome of LSP level and IGP level configuration options

configuration

cut enabled /

rsvp enabled

igp-shortcut

enabled / ldp-

igp-shortcut

enabled / ldp-

over-rsvp dis-

config>router>mpls>lsp>no igp-shortcut

summarizes the outcome in terms of RSVP LSP role of mixing these configuration

cut enabled /

IGP Instance level configurations

cut disabled

cut enabled /

cut disabled

rsvp enabled

7450 ESS MPLS Guide