15-4 Frame Relay Module 4.0 User Guide, Rev 01Bridge Node Default Parameters1 To assure correct operation of the spanning tree algorithm, follow these rules:a. Bridge Max Age must be less than or equal to twice the value of {Bridge ForwardDelay minus 1 second}.b. Bridge Max Age must be greater than or equal to twice the value of {Bridge HelloTime plus 1 second}.Bridge Enabledenables bridging in the node, implementing the spanning tree algorithm.If Bridging is disabled, all Bridge ports on the node will go into Forwardingstate (described under "Bridge Status Displays" on page 19-21). NoBPDUs (see Bridge Hello Time below) will flow. No data will be bridgedexcept terminated LLC2 traffic.Bridge Hello Timeis the frequency with which all bridges on the network will send "Hello" messages(also called BPDUs, or Bridge Protocol Data Units) to adjacent bridges (the next onesin all bridge paths) when the local bridge is "Root." Note that a root bridge is the onewith the lowest ID (which contains its Bridge Priority and MAC address) on thenetwork.Bridge Max Agedetermines how long Hello messages will remain valid when the local bridge is root(described under "Bridge Hello Time").Bridge Forward Delayis the time the bridge will wait after entering Listening state before entering Learningstate, or after entering Learning state before entering Forwarding state This delay isintended to assure that the tree topology is stable before it is put into use.The states are described under "Bridge Status Displays" on page 19-21.Table 15-1 Bridge Node Default ParametersParameter Valid Values Default ValueVirtual LAN ID n/a – accept the defaultBridge Enabled Y/N YBridge Hello Time 1–10 (seconds) 1 2Bridge Max Age 6–40 (seconds) 1 20Bridge For ward Delay 4–30 (seconds) 1 15Bridge Aging Timer 10–10000000 (seconds) 300Bridge Priority 0–65535 32768Max Size Bridge For warding Table 128–65535 32768IP Bridging Enabled Y/N NIPX Bridging Enabled Y/N NSRB ID 0–f (hex) 0Default Ethernet Frame Type Type II, 802.3 Type II
