Information About Hsrp - Cisco Nexus 3000 Series Configuration Manual

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 3 k - d o c f e e d b a c k @ c i s c o . c o m
Configuring HSRP
This chapter describes how to configure the Hot Standby Router Protocol (HSRP) on the Cisco NX-OS
switch.
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Information About HSRP

HSRP is a first-hop redundancy protocol (FHRP) that allows a transparent failover of the first-hop IP
router. HSRP provides first-hop routing redundancy for IP hosts on Ethernet networks configured with
a default router IP address. You use HSRP in a group of routers for selecting an active router and a
standby router. In a group of routers, the active router is the router that routes packets; the standby router
is the router that takes over when the active router fails or when preset conditions are met.
Many host implementations do not support any dynamic router discovery mechanisms but can be
configured with a default router. Running a dynamic router discovery mechanism on every host is not
feasible for a number of reasons, including administrative overhead, processing overhead, and security
issues. HSRP provides failover services to these hosts.
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Information About HSRP, page 12-1
Licensing Requirements for HSRP, page 12-6
Prerequisites for HSRP, page 12-6
Guidelines and Limitations, page 12-6
Default Settings, page 12-6
Configuring HSRP, page 12-7
Verifying the HSRP Configuration, page 12-16
Configuration Examples for HSRP, page 12-16
Additional References, page 12-16
Feature History for HSRP, page 12-17
HSRP Overview, page 12-2
HSRP for IPv4, page 12-3
HSRP Versions, page 12-4
HSRP Authentication, page 12-4
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
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