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Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-03
Chapter 23 Configuring HSRP
Configuring HSRP
• Etherchannel port channel in Layer 3 mode: a port-channel logical interface created by using the
interface port-channel port-channel-number global configuration command and binding the
Ethernet interface into the channel group. For more information, see the “Configuring Layer 3
EtherChannels” section on page 21-11.
All Layer 3 interfaces must have IP addresses assigned to them. See the “Configuring Layer 3
Interfaces” section on page 8-22.
Default HSRP Configuration
Table 23-1 shows the default HSRP configuration.
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
routing port on the cable 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.
Note We recommend that you do not configure a virtual MAC address on the switch interfaces, but instead
use the default well-known virtual MAC address. If it is necessary to configure a virtual MAC
address, for HSRP to operate correctly, the first five bytes must be the same for all MAC addresses
used for HSRP. The last byte represents the group number.
Table 23-1 Default HSRP Configuration
Feature Default Setting
HSRP groups None configured
Standby group number 0
Standby MAC address Well-known MAC address
Standby priority 100
Standby delay 0 (no delay)
Standby track interface priority 10
Standby hello time 3 seconds
Standby holdtime 10 seconds