Specifications

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14-6

Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)

OL-25782-02

Chapter 14 Configuring HSRP

Licensing Requirements for HSRP

The following table shows the licensing requirements for this feature:

Prerequisites for HSRP

HSRP has the following prerequisites:

• You must enable the HSRP feature in a switch before you can configure and enable any HSRP

groups.

Guidelines and Limitations

HSRP has the following configuration guidelines and limitations:

• The minimum hello timer value is 250 milliseconds.

• The minimum hold timer value is 750 milliseconds.

• You must configure an IP address for the interface that you configure HSRP on and enable that

interface before HSRP becomes active.

• For IPv4, the virtual IP address must be in the same subnet as the interface IP address.

• We recommend that you do not configure more than one first-hop redundancy protocol on the same

interface.

• HSRP version 2 does not interoperate with HSRP version 1. An interface cannot operate both

version 1 and version 2 because both versions are mutually exclusive. However, the different

versions can be run on different physical interfaces of the same router.

• You cannot change from version 2 to version 1 if you have configured groups above the group

number range allowed for version 1 (0 to 255).

• Cisco NX-OS removes all Layer 3 configuration on an interface when you change the interface VRF

membership, port channel membership, or when you change the port mode to Layer 2.

Default Settings

Table 14-1 lists the default settings for HSRP parameters.

Product License Requirement

Cisco 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 Cisco NX-OS

licensing scheme, see the Cisco NX-OS Licensing Guide.

Note Make sure the LAN Base Services license is installed on the switch to enable Layer 3 interfaces.