Preview Tool

Cisco Bug: CSCuq88112 - SR: E-flag should not be unset on propagated local pfx with exp-null

Last Modified

Jul 30, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)

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.

The problem happens when the prefix is propagated from another level, and the prefix-sid for the given loopback is configured with "explicit-null"
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.