Cabletron Systems STS16-20D, STS16-20R manual Address Format, System Name, System Location

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or preferred VLAN’s, implying that 63 MAC addresses need to be reserved for BRF.

Summarizing each SmartStack STS16-20D/STS16-20R reserve: Switch Base Address + 31 Addresses for Token Ring ports + 63 MAC Addresses for BRFs = 95, which is rounded up to 96 or hexadecimal 0x60.

The MAC address of the default BRF (trnet-default) will always be the switch base address + 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 BRF will be based on the address of the stackmaster. The stackmaster is determined by software, when the stack consists of two switches back to back and by the port numbers in STS- 8SU/STS-5SU stack configurations.

There is no simple rule to find the default MAC address of other BRF, but it is always in the range described in the following:

Stack Master Base Address + 32 < BRF MAC Address < Stack Master Base Address + 95. And a BRF (VLAN) MAC address is assigned, when the VLAN becomes preferred (that is, it has an assigned port in the actual switch or stack of switches) by selecting the lowest available MAC address above Stack Master Base Address + 32.

If management (SNMP or TELNET) contact with the switch is lost (because, for example, ports are moved from one BRF to another) it is suggested, that a terminal is connected to the OBM port of the switch stack, and the IP Configuration menu is entered. From here, it is possible to read the MAC address of the management entity (BRF).

In version 3.10.0 (and later) it is possible to assign an individual, locally administrated MAC address to each VLAN.

➽Note! A reboot of the switch is necessary after assigning the VLAN LAA. See "VLAN Configuration" on page 86.

Address Format

Display format used for MAC addresses (canonical or non-canonical). Canonical format is typically used in Ethernet networks and is also known as least significant bit first. Non-canonical is typically used in Token Ring networks and is also known as most significant bit first.

System Name

Any name you choose to assign to the switch (on a TCP/IP network, it could be the IP hostname).

System Location

Any text string of max. 64 characters that you have assigned for the switch.

SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Switch Configuration