VRRP
Router Configuration Guide 415
Description This command sets an explicit MAC address used by the virtual router instance overriding the VRRP
default derived from the VRID.
Changing the default MAC address is useful when an existing HSRP or other non-VRRP default MAC
is in use by the IP hosts using the virtual router IP address. Many hosts do not monitor unessential
ARPs and continue to use the cached non-VRRP MAC address after the virtual router becomes master
of the host’s gateway address.
The mac command sets the MAC address used in ARP responses when the virtual router instance is
master. Routing of IP packets with mac-address as the destination MAC is also enabled. The mac
setting must be the same for all virtual routers participating as a virtual router or indeterminate
connectivity by the attached IP hosts will result. All VRRP advertisement messages are transmitted
with mac-address as the source MAC.
The command can be configured in both non-owner and owner vrrp nodal contexts.
The mac command can be executed at any time and takes effect immediately. When the virtual router
MAC on a master virtual router instance changes, a gratuitous ARP is immediately sent with a VRRP
advertisement message. If the virtual router instance is disabled or operating as backup, the gratuitous
ARP and VRRP advertisement message is not sent.
The no form of the command restores the default VRRP MAC address to the virtual router instance.
Default no mac — The virtual router instance uses the default VRRP MAC address derived from the VRID.
Parameters mac-address — The 48-bit MAC address for the virtual router instance in the form
aa:bb:cc:dd:ee:ff or aa-bb-cc-dd-ee-ff where aa, bb, cc, dd, ee and ff are hexadecimal
numbers. Allowed values are any non-broadcast, non-multicast MAC, and non-IEEE
reserved MAC addresses.
master-int-inherit
Syntax [no] master-int-inherit
Context config>router>if>vrrp
config>router>if>ipv6>vrrp
Description This command enables the virtual router instance to inherit the master VRRP router’s advertisement
interval timer which is used by backup routers to calculate the master down timer.
The master-int-inherit command is only available in the non-owner nodal context and is used to allow
the current virtual router instance master to dictate the master down timer for all backup virtual routers.
The master-int-inherit command has no effect when the virtual router instance is operating as master.
If master-int-inherit is not enabled, the locally configured message-interval must match the master’s
VRRP advertisement message advertisement interval field value or the message is discarded.
The no form of the command restores the default operating condition which requires the locally
configured message-interval to match the received VRRP advertisement message advertisement
interval field value.
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