Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 127
• the iLER must receive the entropy label capability signal and be configured to
enable the insertion of entropy labels for the spoke SDP. Inserting an entropy
label adds two labels in the MPLS label stack: the entropy label itself and the
ELI.
At the eLER, use the config>router>rsvp>entropy-label-capability command to
enable entropy label capability on RSVP-TE LSPs.
At the iLER, use the entropy-label command to enable the insertion of the entropy
label into the label stack. The command is found under the Epipe
config>service>epipe>spoke-sdp command, and under the VPLS
config>service>vpls>spoke-sdp and mesh-sdp commands.
For details on entropy labels, refer to the “MPLS Entropy Labels” section in the
7705 SAR MPLS Guide.
3.2.15 Automatic Protection Switching
This section contains information on the following topics:
• APS Overview
• SC-APS
• MC-APS
• K1 and K2 Bytes
• Revertive Mode
• APS Tools Commands
• APS Failure Codes
3.2.15.1 APS Overview
Automatic Protection Switching (APS) allows users to protect a SONET/SDH port or
link with a backup (protection) facility of the same speed but from a different adapter
card. APS provides protection against a port, signal, or adapter card failure. The
7705 SAR supports 1+1 APS protection in compliance with GR-253-CORE and
ITU-T Recommendation G.841 to provide SONET/SDH carrier-grade reliability. All
SONET/SDH paths and channels within a SONET/SDH port are protected.
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