
Configuring Interface and Router Redundancy
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Active Interface MAC Address
When you configure interface redundancy, the active interface uses the following
MAC address in hexadecimal radix:
0x2000 A2
xx xxxx
• 0x20 indicates that the address is locally administered by Bay Networks.
• 00A2 identifies the Bay Networks organizationally unique identifier (OUI).
• xx xxxx is the unique router identification number.
The active interface in an interface redundancy group uses the MAC address for
all traffic, including Breath of Life (BOFL). The MAC address switches among
interfaces in the interface redundancy group so that it always represents the active
interface.
The MAC address affects network layer protocol adjacent host setups on adjacent
routers. For example, if you have adjacent routers and the IP adjacent host is
defined with its next hop being the active interface in an interface redundancy
group, the adjacent host MAC address must be the active interface’s MAC
address, that is,
0x2000 A2
xx xxxx
.
You can find the complete MAC address for the active interface in the interface
MIB (Ethernet, Token Ring, FDDI) of the router on which interface redundancy is
configured. For example, if you are configuring Ethernet, you can find the active
MAC address in the Ethernet MIB by entering the following command from the
Technician Interface:
get wfCSMACDEntry.wfCSMACDMadr.*
Among the entries displayed in the MIB is the MAC address 0x2000 A2
xx xxxx,
which is used for interface redundancy. If you configure more than one interface
redundancy group on the same router, you will see more than one entry with the
same MAC address. This is not a problem because the two redundancy groups are
in different subnets.
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