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Every HP router is shipped with a unique universally-administered 48-bit station
address for each port written in read-only memory (ROM). The first 24 bits are
always 080009 (hexadecimal) from Hewlett-Packard, and the second 24 bits are
unique to each port on each unit manufactured by Hewlett-Packard. Because each
LAN device within your network requires a unique station address, it is imperative
that no other device use the same address; the address assigned in the factory
guards against duplicate addresses.
The station address of each port is used by the protocol application for routing.
Some of the protocols, when enabled, override the currently configured station
address for some or all of the ports. DECnet sets its own single station address
identically on all ports. IPX and IP host-only routing and spanning tree bridging use
the currently configured station address of the WAN1 Port for all ports in the router.
IP routing uses the currently configured station address of the WAN1 port.
By default, the LAN Address field on the Circuit Parameters screen is blank, which
leaves the factory default unchanged. This setting is recommended.
To assign a different station address, enter it in 12-character hexadecimal format.
(The user-configured address is also be ignored by some protocols, as described
earlier.)
The nodes ignores the value of the LAN Address on circuits supporting the Bridge
(with the spanning tree algorithm enabled). In such instances, the bridging/routing
software asserts an internally generated LAN address.
If the node uses only the IP Router, of if it uses the IP Router in conjunction with the
Bridge (with the spanning tree algorithm disabled), you can assigned an Ethernet
address of your choosing. Because each LAN device within you network requests a
unique 48-bit address, it is imperative that you guard against duplicated addresses.
Note: When assigning a user-supplied LAN address, ensure that the least significant
bit of the most significant byte is clear (equal to zero). When the LAN address is
transmitted their bit order is reversed. Consequently, the least significant bit of the
most significant byte is transmitted first. A local one in the first bit position of a
destination address designated a broadcast or multicast address.
During router operation, you can see what station address is actually being used on a
circuit by entering the following NCL command:
get cct.circuit-name .mac_addr
circuit-name is the name of the circuit. The character between mac and addr is an
underline character.
Circuit Parameters
Parameters and Options
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