Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 221)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 197
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Liberal bypass selection and liberal dynamic bypass
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FIGURE 40 Potential link protection with traversing link or node between PLR and MP
Backward compatibility
This is a software only feature and does not require special support from hardware. There are no
backward compatibility issues as this feature is local to RSVP module regarding if the bypass LSP
can serve as backup protection. With the new mode turned on, there can be additional bypass
LSPs qualifying for the backup path.
Limitations
New Dynamic bypass creation at upstream after a failure at any downstream of the FRR LSP might
fail, do to router ID resolution.
This is applicable only if the dynamic bypass creation is triggered from the same FRR LSP with any
of the downstream failed Link. The reasoning behind this is that a failed link IP in the avoid Node
List is not reachable and its node ID cannot be resolved. In such a scenario, the path calculation to
a new Dynamic bypass fails.