Olicom CrossFire 8730, Reference Manual

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CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1 Switch Configuration
All usage of MAC-Addresses in the switch is based upon one address. This address
is denoted the Switch Base address and can be either Burned-in (The factory
assigned Universal Administrated Address UAA) or configured (the Local
Administrated Address LAA). To configure a LAA address, use the Switch
Configuration screen from a console session or an SNMP based management tool.
Note that a restart is necessary when changing the base MAC address.
The greeting screen on the console will always show the current active Switch base
Address.
The switch reserves 31 addresses for ports.
The Token-Ring ports on a switch will be assigned MAC addresses using the
following scheme:
•
BASE Module port 1- 20 will be assigned Switch Base A port number
OR:
•
A Token-Ring port will be assigned a MAC address, which is Switch Base
A the port number displayed on the port configuration screen (or
interface table for SNMP).
This MAC address is used for the Token-Ring MAC protocol, and for the
spanning tree protocol.
The switch reserves 63 addresses for TrBRF ( VLAN).
Each VLAN has an attached Bridge relay function (TrBRF) and a Management
entity (IP-protocol stack), and consequently it needs a MAC Address. In the switch,
these two logical units use the same address, however this address must be unique
in the network. This is ensured by assigning MAC address to TrBRF’s from the
Switch Base A 32 (0x20) and upwards. The switch is designed in such a
way, that it operates with 63 active or preferred VLAN’s, implying that 63 MAC
addresses need to be reserved for TrBRF.
Summarizing, each CrossFire 8730 reserve: Switch Base A 31 Addresses
for Token-Ring ports + 63 MAC Addresses for TrBRFs = 95, which is rounded up
to 96 or hexadecimal 0x60.
The MAC address of the default TrBRF (brf-default) will always be the switch base
a 32. If the switch operates in a stack, only one of the switches will operate
the bridge relay function. Hence the MAC address of the default TrBRF will be the
base address of the stack 32. The stackmaster is determined by software,
when the stack consists of two switches back to back and by the port numbers in
8300/8635 stack configurations.
There is no simple rule to find the MAC address of other TrBRF, but it is always
within the range described, as follows: