Configuring Hsrp; Information About Hsrp - Cisco Nexus 7000 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 7 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
device.
This chapter includes the following sections:
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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.
This section includes the following topics:
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OL-20002-02
Information About HSRP, page 19-1
Licensing Requirements for HSRP, page 19-6
Prerequisites for HSRP, page 19-6
Guidelines and Limitations, page 19-7
Configuring HSRP, page 19-7
Verifying HSRP Configuration, page 19-17
HSRP Example Configuration, page 19-17
Default Settings, page 19-18
Additional References, page 19-18
Feature History for HSRP, page 19-19
HSRP Overview, page 19-2
HSRP Versions, page 19-3
HSRP Authentication, page 19-4
HSRP Addressing, page 19-4
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
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