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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 36 Configuring HSRP
Configuring HSRP
• All Layer 3 interfaces must have IP addresses assigned to them. See the “Configuring Layer 3
Interfaces” section on page 9-22.
• HSRPv2 and HSRPv1 can be configured on the same switch if HSRPv2 is configured on different
interfaces than those on which HSRPv1 is configured.
• The version of an HSRP group can be changed from HSRPv2 to HSRPv1 only if the group number
is less than 256.
• If you change the HSRP version on an interface, each HSRP group resets because it now has a new
virtual MAC address.
Enabling HSRP
The standby ip interface configuration command activates HSRP on the configured interface. If an IP
address is specified, that address is used as the designated address for the Hot Standby group. If no IP
address is specified, the address is learned through the standby function. You must configure at least one
Layer 3 port on the LAN with the designated address. Configuring an IP address always overrides
another designated address currently in use.
When the standby ip command is enabled on an interface and proxy ARP is enabled, if the interface’s
Hot Standby state is active, proxy ARP requests are answered using the Hot Standby group MAC
address. If the interface is in a different state, proxy ARP responses are suppressed.
Beginning in privileged EXEC mode, follow these steps to create or enable HSRP on a Layer 3 interface:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and enter the Layer 3 interface on
which you want to enable HSRP.
Step 3
no shutdown Enable the port, if necessary. By default, user network interfaces (UNIs)
and enhanced network interfaces (ENIs) are disabled, and network node
interfaces (NNIs) are enabled.
Step 4
no switchport If necessary, disable Layer 2 switching on the port to enable the Layer 3
interface.
Step 5
standby version {1 | 2} (Optional) Configure the HSRP version on the interface.
• 1— Select HSRPv1.
• 2— Select HSRPv2.
If you do not enter this command or do not specify a keyword, the
interface runs the default HSRP version, HSRP v1.