
4
VMAC Mode
For each VRID, a virtual MAC (VMAC) address is assigned to the backup address. The VMAC address is included in all VRRP packet transmissions as the source MAC address; the physical MAC address is not used.
When you configure a VRID, you specify which mode IPSO uses to select the VMAC address. You can use any of the modes for Virtual LAN deployments, which forward traffic based on the VLAN address and destination MAC address.
Interface
Note
If you configure different VMACs on the master and backup, you must take care to choose the correct proxy ARP setting for Network Address Translation.
Interface mode can be useful with certain switches that have problems with packets on multiple ports with the same MAC address. In these cases, you can use Interface mode to ensure that the VMAC from the master and backup are not the same.
Static
Note
If you configure different VMACs on the master and backup, you must take care to choose the correct Proxy ARP settings when configuring proxy ARP setting for Network Address Translation.
Extended
Note
If you set the VMAC mode to interface or static, syslog error messages are displayed when you reboot or at failover, indicating duplicate IP addresses for the master and backup. This is expected behavior since both the master and backup routers are temporarily using the same virtual IP address until they resolve into master and backup.
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