Description

On Junos and Junos OS Evolved platforms configured with IS-IS and MPLS Traffic Engineering (TED), a significant issue arises when there is an Intermediate System (IS) ISO address change. Despite proper deletion in IS-IS and TED databases, stale entries persist in the link-state distribution (lsdist) table, impacting routes and services associated with these outdated entries.

Symptoms

  • The main trigger for this issue is an ISO address change
  • Stale entries present in the lsdist table, even after deletion in IS-IS and TED
  • Use CLI Command to check for duplicate entries
user@device> show route table lsdist.0

Solution

The problem has been addressed via PR 1713008.

Preventive Steps:

Overload the Device:

  • Overload the device to minimize the impact during the ISO address change.

Deactivate ISIS:

  • Temporarily deactivate ISIS before changing the ISO address.

Change System ID:

  • Change the System ID during the ISO address modification.

Activate ISIS:

  • Activate ISIS after completing the ISO address change.

Modification History

2024-03-12 : Article Created