Cisco Bug: CSCuq88112 - SR: E-flag should not be unset on propagated local pfx with exp-null
Jan 10, 2017
- Cisco Carrier Routing System
Known Affected Releases
Symptom: In Segment Routing environment, local prefixes might be advertised with P-bit set and E-bit clear. This causes the adjacent routers to send prefixes with a real label (the prefix sid label), and those would be dropped because ISIS SR does not install MPLS forwarding entries for the local prefixes. Conditions: The problem happens when the prefix is propagated from another level, and the prefix-sid for the given loopback is configured with "explicit-null"
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