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Cisco Bug: CSCvu82520 - SISF IPV6 NS probes failing when end-device is connected to pvlan isolated host port on 16.12

Last Modified

Aug 20, 2020

Products (1)

  • Cisco Catalyst 9200 Series Switches

Known Affected Releases


Description (partial)

IPv6 NS probes generated by SISF will not reach an end-device even though IPv4 ARP probes will.

Given this the SISF Database IPv6 entries for the host will eventually get STALE until traffic for/from the host is generated. If security-mode guard is active the device could end up with connectivity issues.

The port where the device is connected is configured as an isolated pvlan host port (switchport mode private-vlan host).

The device is a silent host type of device which has a statically assigned IPv6, meaning only gleaning traffic is used to refresh SISF DB entries or it relies on SISF Probes and the time interval of traffic generated by the device is greater then the SISF DB stale timer.

Switch where the device is connected is running any version prior to 17.1.1
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