rfc9339v2.txt   rfc9339.txt 
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TE Metric sub-TLV of the Link TLV in its TE Opaque LSA [RFC3630] when TE Metric sub-TLV of the Link TLV in its TE Opaque LSA [RFC3630] when
the reverse metric feature is enabled (refer Section 7 for details on the reverse metric feature is enabled (refer Section 7 for details on
enablement of RM). The rules for doing so are analogous to those enablement of RM). The rules for doing so are analogous to those
given above for the Router-LSA. given above for the Router-LSA.
7. Operational Guidelines 7. Operational Guidelines
The signaled RM does not alter the OSPF metric parameters stored in a The signaled RM does not alter the OSPF metric parameters stored in a
receiving router's persistent provisioning database. receiving router's persistent provisioning database.
Routers that receive a RM advertisement SHOULD log an event to notify Routers that receive an RM advertisement SHOULD log an event to
system administration. This will assist in rapidly identifying the notify system administration. This will assist in rapidly
node in the network that is advertising an OSPF metric or TE metric identifying the node in the network that is advertising an OSPF
different from what is configured locally on the device. metric or TE metric different from what is configured locally on the
device.
When the link TE metric is raised to the maximum value, either due to When the link TE metric is raised to the maximum value, either due to
the RM mechanism or by explicit user configuration, this SHOULD the RM mechanism or by explicit user configuration, this SHOULD
immediately trigger the CSPF (Constrained Shortest Path First) immediately trigger the CSPF (Constrained Shortest Path First)
recalculation to move the TE traffic away from that link. recalculation to move the TE traffic away from that link.
An implementation MUST NOT signal RM to neighbors by default and MUST An implementation MUST NOT signal RM to neighbors by default and MUST
provide a configuration option to enable the signaling of RM on provide a configuration option to enable the signaling of RM on
specific links. An implementation MUST NOT accept the RM from its specific links. An implementation MUST NOT accept the RM from its
neighbors by default. An implementation MAY provide configuration to neighbors by default. An implementation MAY provide configuration to
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