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.
SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured
for stateful switchover (SSO) redundancy mode. When an RP is active and the other RP is standby, SSO
enables the standby RP to take over if the active RP fails.
With this functionality, HSRP SSO information is synchronized to the standby RP, allowing traffic that is
sent using the HSRP virtual IP address to be continuously forwarded during a switchover without a loss of
data or a path change. Additionally, if both RPs fail on the active HSRP device, then the standby HSRP device
takes over as the active HSRP device.
The feature is enabled by default when the redundancy mode of operation is set to SSO.
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
upvoted 1 times
...
This section is not available anymore. Please use the main Exam Page.350-401 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Huntkey
Highly Voted 1 year, 11 months agoMarcinko
6 months, 4 weeks agoTSKARAN
Highly Voted 1 year, 9 months agomatass_md
Most Recent 2 months agojmarko80
3 months agojmarko80
3 months ago[Removed]
4 months, 2 weeks ago[Removed]
5 months agoShri_Fcb10
5 months agoMarcinko
6 months, 4 weeks ago