HSRP Between 6509 pair and a 9500 stackwise

[NETAD]

Hello, is it possible to add a pair of 9500's configured in a stackwise virtual to HSRP group configured between 2 6509's? 

[Reza Sharifi]

Hi,

So, one 6509 is active HSRP and the other one is standby and you want to add a second standby switch that is configured as Stackwise virtual?

[NETAD]

Yes Reza. For migration purposes so the the ARP table doesn't have to change on the endpoints when we swing L3 to the new 9500 core. 

[Reza Sharifi · Accepted solution]

It does not appear that it is supported:

All Layer 3 neighboring devices must be an NSF helper or NSF-capable to support graceful restart
capability.
• For IETF, all neighboring devices must be running an NSF-aware software image.
• The Hot Standby Routing Protocol (HSRP) is not supported with NSF SSO. Do not use HSRP with NSF
SSO.
• An NSF-aware device cannot support two NSF-capable peers performing an NSF restart operation at
the same time. However, both neighbors can reestablish peering sessions after the NSF restart operation
is complete.

Here is a link to the document:

see page-2

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-10/configuration_guide/ha/b_1610_ha_9500_cg.pdf

HTH