NSF capability is supported for IPv4 routing protocols only. NSF capability is not supported for IPv6 routing protocols.
NSF does not support IP Multicast Routing, as it is not SSO-aware.
You must configure SSO in order to use NSF with any supported protocol.
The Hot Standby Routing Protocol (HSRP) is not supported with NSF SSO. Do not use HSRP with NSF SSO.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-6/configuration_guide/stck_mgr_ha/b_166_nsf_sso_9400_cg.html
Restrictions for Cisco Nonstop Forwarding with Stateful Switchover
The following are restrictions for configuring NSF with SSO:
NSF capability is supported for IPv4 routing protocols only. NSF capability is not supported for IPv6 routing protocols.
NSF does not support IP Multicast Routing, as it is not SSO-aware.
For NSF operation, you must have SSO configured on the device.
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.
For SSO operation, ensure that both active and standby devices run the same version of the Cisco IOS XE image. If the active and standby devices are operating different images, SSO failover might cause an outage.
NSF does not support ipv6
https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/catalyst9400/software/release/16-6/configuration_guide/stck_mgr_ha/b_166_nsf_sso_9400_cg.html
Nowdays HSRP is supported in SSO as also IPV6
https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/ntw-servs/b-network-services/m_fhp-hsrp-sso.html
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-10/configuration_guide/rtng/b_1610_rtng_9300_cg/b_1610_rtng_9300_cg_chapter_010001.html
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