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Cisco Bug: CSCvt24002 - IGP Deleting a path causes route to become Unlabeled in RIB

Last Modified

Oct 01, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9912 Router
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Known Affected Releases


Description (partial)

Unlabelled route in RIB that has a label in OSPF/ISIS

OSPF Route with multiple paths, A backup route from another protocol (BGP/ISIS/OSPF)
One path is removed (ex due to the remote interface going down)
The route then shows as having no local label in "show route <> detail" despite there being multiple labels in the local label list, with the one that matches the route shown last:

Routing entry for
  Known via "ospf 1", distance 110, metric 51, labeled SR, type intra area
  Installed Mar  3 17:38:09.462 for 00:00:09
  Routing Descriptor Blocks, from, via GigabitEthernet0/2/0/0
      Route metric is 51
      Label: 0x3 (3)
      Tunnel ID: None
      Binding Label: None
      Extended communities count: 0
      Path id:1       Path ref count:1
      NHID eid:0xffffffffffffffff
      MPLS eid:0x1382600000002
      Backup path id:2
      OSPF area: 0
      Path flags: 0x400c0 (protected, lfa_or_ecmp_backup, ospf_ar_set)
      Private flags: 0x42 (has_vpn_data, rib_encap_id)
  Route version is 0x34 (52)
  No local label
  IP Precedence: Not Set
  QoS Group ID: Not Set
  Flow-tag: Not Set
  Fwd-class: Not Set
  Download Priority 1, Download Version 76
  Client-id: 33
  Route flags: 0xd800000 (ldp_sr_merge_request, rib_precedence_over_ldp, ospf_ar_set, label_sr)
  Route Extended flags: 0x48 (ldp_sr_merge_request, rib_precedence_over_ldp)
  Route private flags: 0x20 (priority_promotion)
  Route head pointer: 0x9e42458
  Local Label List
    i 16012 (Client ID: 26, Distance: 115, Metric: 1,)
    O 16003 (Client ID: 33, Distance: 256, Metric: 4294967295,)
  No advertising protos.
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