Label Distribution Protocol
Page 230 7210 SAS M, T, X, R6, Mxp MPLS Configu-
ration Guide
manually the peer parameters or configure a mapping of a targeted session peer parameter
template to a prefix policy. These features are:
→ BGP shortcut (igp-shortcut ldp option in BGP),
→ IGP shortcut (rsvp-shortcut option in IGP),
→ LDP shortcut for IGP routes (ldp-shortcut option in router level),
→ static route LDP shortcut (ldp option in a static route),
→ VPRN service (autobind ldp option)
As the above triggering events can occur simultaneously or in any arbitrary order, the LDP code
implements a priority handling mechanism in order to decide which event overrides the active
targeted session parameters. The overriding trigger becomes the owner of the targeted adjacency
to a given peer and will be shown in ‘show router ldp peer’.
The table below summarizes the triggering events and the associated priority.
Table 5: Triggering Events and the Associated Priority
Triggering Event Automatic Creation of Tar-
geted Hello Adjacency
Active Targeted Adjacency
Parameter Override Priority
Manual configuration of
peer parameters
(creator=manual)
Yes 1
Mapping of targeted
session template to
prefix policy
(creator=template)
Yes 2
Manual configuration of
SDP with signaling tldp
option enabled
(creator=service
manager)
Yes 3
PW template binding in
BGP-AD VPLS
(creator=service
manager)
Yes 3
PW template binding in
FEC 129 VLL
(creator=service
manager)
Yes 3
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