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Cisco Bug: CSCvv19208 - Cannot change "ipv6 nd ra-lifetime" to 1800

Last Modified

Oct 11, 2020

Products (1)

  • Cisco MDS 9000 NX-OS and SAN-OS Software

Known Affected Releases

9.3(3)

Description (partial)

Symptom:
Steps to reproduce the issue
----------------------------
1. Configure an Ipv6 address on an interface
2. Verify that the default router-lifetime is set to default 1800 sec (600*3)
3. Change the Max-rainterval to 30 by issuing the following command
ipv6 nd ra-interval 30 min 10
4. verify the ra-lifetime gets changed to 90 secs (3x ra-interval)
show ipv6 nd interface <interface name>
5. Now configure the ra-lifetime back to be 1800 by issuing the following command
ipv6 nd ra-lifetime 1800
6. verify the user-configured router-life time is set by issuing
show ipv6 nd interface <interface name> and we see it is set back to default (3x ra-interval) 90 sec instead of 1800 as per just configured command
7. Now configure the ra-lifetime to 1801 or any other value except 1800
9. Verify the ra-lifetime by issuing the following command 
show ipv6 nd interface <interface name> and we see the ra-lifetime changing to the just configured value.

Conclusion:

We can configure ra-lifetime to any value except for 1800 secs which is the default; therefore 3x current configure ra-interval, but never actually able to set it to 1800.

Conditions:
Reproduced in the following NXOS versions:

7.0(3)I7(6)
7.0(3)I7(8)
9.3(3)
9.3(4)
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