MPLS Guide MPLS and RSVP-TE
3HE 18686 AAAB TQZZA © 2022 Nokia.
Use subject to Terms available at: www.nokia.com
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• If a node-protect dynamic bypass cannot be found or signaled, the PLR attempts
a link-protect dynamic bypass LSP. As with the existing implementation of
dynamic bypass within the same area, the PLR attempts in the background to
signal a node-protect bypass at the receipt of every third RESV refresh message
for the primary path.
• Refresh reduction over dynamic bypass only works if the RRO node-id also
contains the interface address. Otherwise, the neighbor is not created once the
bypass is activated by the PLR. The Path state then times out after three
refreshes following the activation of the bypass backup LSP.
A one-to-one detour backup LSP cannot be used at the PLR for the protection of the
ABR. As a result, a 7705 SAR, acting as a PLR, will not signal a one-to-one detour
LSP for ABR protection. In addition, an ABR will reject a PATH message, received
from a third party implementation, with a detour object and with the ERO having the
next hop loose. This is performed whether the cspf-on-loose option is enabled or
not on the 7705 SAR. In other words, the 7705 SAR, working as a transit ABR for the
detour path, rejects the signaling of an inter-area detour backup LSP.
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