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19-7
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 19 Configuring HSRP
Guidelines and Limitations
• You must enable the HSRP feature in a device before you can configure and enable any HSRP
groups.
• If you configure VDCs, install the Advanced Services license and enter the desired VDC (see the
Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 4.x).
Guidelines and Limitations
HSRP has the following guidelines and limitations:
• You must configure an IP address for the interface that you configure HSRP on and enable that
interface before HSRP becomes active.
• 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.
• If you configure virtual MAC addresses with vPC, you must configure the same virtual MAC
address on both vPC peers.
• You cannot use the HSRP MAC address burned-in option on a VLAN interface that is a vPC
member.
Configuring HSRP
This section includes the following topics:
• Enabling the HSRP Feature, page 19-8
• Configuring an HSRP Group, page 19-8
• Configuring the HSRP Version, page 19-10
• Configuring the HSRP Virtual MAC Address, page 19-10
• Authenticating HSRP, page 19-11
• Configuring HSRP Object Tracking, page 19-12
• Configuring the HSRP Priority, page 19-14
• Customizing HSRP, page 19-15
• Configuring Extended Hold Timers for HSRP, page 19-16
Note If you are familiar with the Cisco IOS CLI, be aware that the Cisco NX-OS commands for this feature
might differ from the Cisco IOS commands that you would use.
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