High Availability And Extended Non-Stop Forwarding; Virtualization Support; Licensing Requirements For Hsrp; Prerequisites For Hsrp - Cisco Nexus 7000 Series Configuration Manual

Licensing Requirements for HSRP

S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
You should configure HSRP on the primary vPC peer device as active and HSRP on the vPC secondary
Note
device as standby.

High Availability and Extended Non-Stop Forwarding

HSRP supports stateful restarts and stateful switchover. A stateful restart occurs when the HSRP process
fails and is restarted. Stateful switchover occurs when the active supervisor switches to the standby
supervisor. Cisco NX-OS applies the run-time configuration after the switchover.
If HSRP hold timers are configured for short time periods, these timers may expire during a controlled
switchover or in-service software upgrade (ISSU). HSRP supports extended non-stop forwarding (NSF)
to temporarily extend these HSRP hold timers during a controlled switchover or in-service software
upgrade (ISSU).
With extended NSF configured, HSRP sends hello messages with the extended timers. HSRP peers
update their hold timers with these new values. The extended timers prevent unnecessary HSRP state
changes during the switchover or ISSU. After the switchover or ISSU event, HSRP restores the hold
timers to their original configured values. If the switchover fails, HSRP restores the hold timers after the
extended hold timer values expire.
See the

Virtualization Support

HSRP supports Virtual Routing and Forwarding instances (VRFs). VRFs exist within virtual device
contexts (VDCs). By default, Cisco NX-OS places you in the default VDC and default VRF unless you
specifically configure another VDC and VRF.
If you change the VRF membership of an interface, Cisco NX-OS removes all Layer 3 configuration,
including HSRP.
For more information, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration
Guide, Release 4.x and see
Licensing Requirements for HSRP
The following table shows the licensing requirements for this feature:
Product License Requirement
NX-OS HSRP requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to you. For a complete explanation of the NX-OS licensing
scheme, see the Cisco NX-OS Licensing Guide.

Prerequisites for HSRP

HSRP has the following prerequisites:
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
19-6
"Configuring Extended Hold Timers for HSRP" section on page 19-16
Chapter 14, "Configuring Layer 3 Virtualization."
Chapter 19 Configuring HSRP
for more information.
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