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190 Nokia Network Voyager for IPSO 4.0 Reference Guide
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.
VRRP—The default mode. IPSO sets the VMAC to the format outlined in the VRRP
protocol specification RFC 3768. It is automatically set to the same value on all nodes of a
VRID.
Interface mode—IPSO sets the VMAC to the MAC address of the local interface. If you
select interface mode for both master and backup, the VMAC is different for each. The
VRRP IP addresses are associated with different VMACs because they depend on the MAC
address of the physical interfaces of the platform that is master at the time.
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 mode—Select this mode if you want to set the VMAC address manually, then enter
the 48-bit VMAC address in the Static VMAC text field.
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 mode—Similar to VRRP mode, except the system dynamically calculates three
additional bytes of the interface hardware MAC address to generate a more random address.
If you select this mode, IPSO constructs the same MAC address for master and backup
platforms within the VRID.
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.