Comtrol ES7506 User Manual
Page 66
66 - RSTP
RocketLinx ES7506 User Guide: 2000529 Rev. F
Configuration Using the Web Interface
Rapid Spanning Tree Protocol Page
RSTP
You must first Enable STP/RSTP mode, before configuring any related parameters.
Parameter settings 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
Priority (0-
61440)
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 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 higher bridge priority. Ex: 4096 is higher than 32,768.
Max Age (6-40)
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 ES7506 is not the root bridge, and if it has not received a hello message from the
root bridge in an amount of time equal to Max Age, then the 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.
Hello Time (1-
10)
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 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.
Forward Delay
Time (4-30)
Enter a value between 4 and 30 seconds. This value is the time that a port waits before
changing from Spanning Tree Protocol learning and listening states to forwarding state.
This is the amount of time the 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
Admin Path
Cost
Enter a number between 1 and 200,000,000. This value represents the cost of the path to
the other bridge from the transmitting bridge at the specified port.
Priority
Enter a value between 0 and 240, using multiples of 16. This is the value that decides
which port should be blocked by priority in a LAN.
Admin P2P
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), 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.
Admin Edge
A port directly connected to the end stations cannot create a bridging loop in the network.
To configure 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.
Apply
Click Apply to apply the settings.
Note: You must Save the settings (
), if you want to maintain these settings if the
ES7506 is powered off.