Cabletron Systems SPECTRUM 1800 User Manual page 196

Bridge Configuration
You can conÞgure the following bridging parameters:
Virtual LAN ID
This ID is only used in an 802.5 Source Route environment and is normally
assigned by a system administrator. It is the ID number that is inserted into the
Token Ring RIF Þeld representing the internal virtual ring for LLC2 or bridged
trafÞc.
Each Virtual LAN ID must be unique among all LAN IDs throughout the network
on which this device will operate.
Forwarding Table Size
Under the Spanning Tree concept, bridges automatically maintain forwarding
tables by exchanging messages (BPDUs) with other bridges on the network. By
using the information in the forwarding tables, bridges determine single paths for
trafÞc between endpoints (assuming there are multiple paths.)
This Þeld determines the maximum number of entries allowed in the bridgeÕs
forwarding table. The actual number may be limited by available memory. The
default value for this parameter is 65535.
Source Route Bridge ID
This ID is only used in a 802.5 Source Route environment. If the outgoing port is
conÞgured as a Source Route bridge, it is necessary for the FRX or SmartSwitch
1800 to generate the Routing Information Field (RIF) in forwarded frames. This
Bridge ID supplies the Source Route Bridge ID that will be inserted into the RIF.
11-2
Figure 11-1. Bridge ConÞguration
Configuring Device-Level Bridging Parameters