Symptom

ISIS keeps logging the bellow error message, and keeps using stale local Adjacency SID labels. RP/0/0/CPU0:R2#RP/0/0/CPU0:Aug 10 05:30:11.687 PDT: isis[1011]: %ROUTING-ISIS-3-MFI_ERR : Error: 'Adj-sid[0] create failed for nh-addr:1.0.0.1, ifh:(Gi0/0/0/0, 0x60) type:0, tbl:0xe0000000 area_index:1: 0x42d38200 'MPLS_LSD' detected the 'warning' condition 'RW Creation aborted due to related Lbl Alloc failure''

Conditions

Problem happens when SRLB range is reconfigured to use the label space previously available for dynamic labels (from which ISIS allocated existing Adjacency SID labels), and the SRLB change is forced using the following command: clear segment-routing local-block discrepancy all

Workaround

To recover from the failure state, restart ISIS process. To avoid entering the problem state, if the current SRLB range neesd to be recinfigured, select new SRLB label range that does not contain any Adjacency SID labels that ISIS currently uses.

Further Problem Description