3com 3CDSG8 사용자 가이드
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RSTP
automatically take over when a primary link goes down. The spanning tree algorithms supported by
this switch include these versions:
this switch include these versions:
• STP – Spanning Tree Protocol (IEEE 802.1D)
• RSTP – Rapid Spanning Tree Protocol (IEEE 802.1w)
• RSTP – Rapid Spanning Tree Protocol (IEEE 802.1w)
10.1.1
RSTP System Configuration
There are five configurable parameters in this table. As follows:
• System Priority - This parameter configures the spanning tree priority globally for this switch.
The device with the highest priority becomes the STA root device. However, if all devices have
the same priority, the device with the lowest MAC address will then become the root device.
Number between 0 - 61440 in increments of 4096. Therefore, there are 16 distinct values.
the same priority, the device with the lowest MAC address will then become the root device.
Number between 0 - 61440 in increments of 4096. Therefore, there are 16 distinct values.
• Hello Time - Interval (in seconds) at which the root device transmits a configuration message
(BPDU frame). Number between 1 - 10 (default is 2).
• Max Age - The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure. That also means the maximum life
time for a BPDU frame. Number between 6 - 40 (default is 20).
time for a BPDU frame. Number between 6 - 40 (default is 20).
• Forward Delay - ?The maximum time (in seconds) the root device will wait before changing
states (i.e., discarding to learning to forwarding). Number between 4 - 30 (default is 15).
• Force Version - Set and show the RSTP protocol to use. Normal - use RSTP, Compatible -
compatible with STP.
10.1.2
RSTP System Configuration
The table has one row for each port and four columns. The columns are:
• Port - The port ID. It can not be changed. Aggregations means any configured trunk group.
• Enabled - Click on the tick-box to enable/disable the RSTP protocol for the port.
• Edge - Expect the port to be an edge port (linking to an end station) or a link to another STP
• Enabled - Click on the tick-box to enable/disable the RSTP protocol for the port.
• Edge - Expect the port to be an edge port (linking to an end station) or a link to another STP
device.
• Path Cost - This parameter is used by the STP to determine the best path between devices.
Therefore, lower values should be assigned to ports attached to faster media, and higher
values assigned to ports with slower media. Set the RSTP pathcost on the port. Number
between 0 - 200000000. 0 means autogenerated pathcost.
values assigned to ports with slower media. Set the RSTP pathcost on the port. Number
between 0 - 200000000. 0 means autogenerated pathcost.