Comtrol ES7506 User Manual page 60

RSTP
Rapid Spanning
Tree Protocol
You must first Enable STP/RSTP mode, before configuring any related parameters. Parameter settings
RSTP required for both STP and RSTP are the same. 802.1d refers to STP mode, while 802.1w refers to faster
RSTP mode.
Bridge Configuration
RSTP uses bridge ID to determine the root bridge, the bridge with the highest bridge ID becomes the
root bridge. The bridge ID is composed of bridge priority and bridge MAC address. The bridge with the
highest priority becomes the highest bridge ID. If all the bridge IDs have the same priority, the bridge
Priority (0-61440)
with the lowest MAC address then becomes the root bridge.
Note: The bridge priority value must be in multiples of 4,096. A device with a lower number has a
Enter a value from 6 to 40 seconds here. This value represents the time that a bridge waits without
receiving Spanning Tree Protocol configuration messages before attempting to reconfigure.
If the RocketLinx ES7506 is not the root bridge, and if it has not received a hello message from the root
Max Age (6-40)
bridge in an amount of time equal to Max Age, then the RocketLinx ES7506 reconfigures itself as a root
bridge. Once two or more devices on the network are recognized as a root bridge, the devices
renegotiate to set up a new spanning tree topology.
Enter a value from 1 to 10 seconds here. This is a periodic timer that drives the switch to send out bridge
protocol data unit (BPDU) packet to check current STP status. The root bridge of the spanning tree
Hello Time (1-10)
topology periodically sends out a hello message to other devices on the network to check if the topology
is healthy. The hello time is the amount of time the root has waited during sending hello messages.
Enter a value between 4 and 30 seconds. This value is the time that a port waits before changing from
Forward Delay
Spanning Tree Protocol learning and listening states to forwarding state. This is the amount of time the
Time (4-30)
RocketLinx ES7506 waits before checking to see if it should be changed to a different state.
Note: You must observe the following rule to configure Hello Time, Forwarding Delay, and Max Age parameters.
2 × (Forward Delay Time – 1 sec) ≥ Max Age Time ≥ 2 × (Hello Time value + 1 sec)
Port Configuration
Enter a number between 1 and 200,000,000. This value represents the cost of the path to the other bridge
Admin Path Cost
from the transmitting bridge at the specified port.
Enter a value between 0 and 240, using multiples of 16. This is the value that decides which port should
Priority
be blocked by priority in a LAN.
Some of the rapid state transitions that are possible within RSTP depend upon whether the port of
concern can only be connected to another bridge (that is, it is served by a point-to-point LAN segment),
Admin P2P or if it can be connected to two or more bridges (i.e, it is served by a shared-medium LAN segment).
This function allows P2P status of the link to be manipulated administratively. Auto means to auto
select P2P or Share mode. P2P means P2P is enabled, while Share means P2P is disabled.
A port directly connected to the end stations cannot create a bridging loop in the network. To configure
Admin Edge this port as an edge port, set the port to the Enable state. When the non-bridge device connects an admin
edge port, this port is in a blocking state and turns to a forwarding state in 4 seconds.
Click Apply to apply the settings.
Apply
Note: You must Save the settings (Page 104), if you want to maintain these settings if the RocketLinx
60 - RocketLinx ES7506 User Guide: 2000529 Rev. E
higher bridge priority. Ex: 4096 is higher than 32,768.
ES7506 is powered off.
Description
RSTP