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currently in use.
When the standby ip command is enabled on an interface, the handling of proxy ARP requests is
changed (unless proxy ARP was disabled). If the interface s Hot Standby state is active, proxy ARP
requests are answered using the Hot Standby group s MAC address. If the interface is in a different
state, proxy ARP responses are suppressed.
When group number 0 is used, no group number is written to NVRAM, providing backward
compatibility.
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standby ip
Examples The following example activates HSRP for group 1 on Ethernet interface 0. The IP address used by the
Hot Standby group will be learned using HSRP.
interface ethernet 0
standby 1 ip
In the following example, all three virtual IP addresses appear in the ARP table using the same (single)
virtual MAC address. All three virtual IP addresses are using the same HSRP group (group 0).
ip address 1.1.1.1. 255.255.255.0
ip address 1.2.2.2. 255.255.255.0 secondary
ip address 1.3.3.3. 255.255.255.0 secondary
ip address 1.4.4.4. 255.255.255.0 secondary
standby ip 1.1.1.254
standby ip 1.2.2.254 secondary
standby ip 1.3.3.254 secondary
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standby mac-address
standby mac-address
To specify a virtual MAC address for Hot Standby Router Protocol (HSRP), use the standby
mac-address interface configuration command. To revert to the standard virtual MAC address
(0000.0C07.ACxy), use the no form of this command.
standby [group-number] mac-address macaddress
no standby [group-number] mac-address
Syntax Description group-number (Optional) Group number on the interface for which HSRP is being
activated. The default is 0.
macaddress Media Access Control (MAC) address.
Defaults If this command is not configured, and the standby use-bia command is not configured, the standard
virtual MAC address is used: 0000.0C07.ACxy, where xy is the group number in hexadecimal. This
address is specified in RFC 2281, Cisco Hot Standby Router Protocol (HSRP).
Command Modes Interface configuration
Command History Release Modification
11.2 This command was introduced.
Usage Guidelines This command can not be used on a Token Ring Interface.
HSRP is used to help endstations locate the first hop gateway for IP routing. The endstations are
configured with a default gateway. However, HSRP can provide first-hop redundancy for other
protocols. Some protocols, such as APPN, use the MAC address to identify the first hop for routing
purposes. In this case, it is often necessary to be able to specify the virtual MAC address; the virtual IP
address is unimportant for these protocols. Use the standby mac-address command to specify the
virtual MAC address.
The MAC address specified is used as the virtual MAC address when the router is active.
This command is intended for certain APPN configurations. The parallel terms are as follows:
APPN IP
end node host
network node router or gateway
In an APPN network, an end node is typically configured with the MAC address of the adjacent network
node. Use the standby mac-address command in the routers to set the virtual MAC address to the value
used in the end nodes.
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standby mac-address
Examples If the end nodes are configured to use 4000.1000.1060 as the MAC address of the network node, the
command to configure HSRP group 1 with the virtual MAC address is as follows:
standby 1 mac-address 4000.1000.1060
Related Commands Command Description
show standby Displays HSRP information.
standby use-bia Configures HSRP to use the burned-in address of the interface as its virtual
MAC address.
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standby mac-refresh
standby mac-refresh
To change the interval at which packets are sent to refresh the MAC cache when Hot Standby Router
Protocol (HSRP) is running over FDDI, use the standby mac-refresh interface configuration
command. To restore the default value, use the no form of this command. [ Pobierz całość w formacie PDF ]