BugZero | Cisco BugID CSCwt32138 - Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Last updated on February 20th, 2026

BugZero Risk Score
5.0 Medium

Overall: 5.0

Severity: 5.5

Lifecycle: 7.8

Popularity: 3.7

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Bug Details

Views: 1

Description

Symptom

The default value for DNS options in an IPv6 RA configuration is 1.5*MaxRtrAdvInterval.

Conditions

Configuring default DNS options in an IPv6 RA uses 900s instead of 1800s.

Workaround

Specify a lifetime when configuring IPv6 RA DNS Options.

Further Problem Description

Change history

2026-02-20 Added: 10.6(2)

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Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Last updated on February 20th, 2026

BugZero Risk Score5.0 Medium

Bug Details

Symptom

Conditions

Workaround

Further Problem Description

Links

Top Cisco Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
5.0 Medium