Netgear S3300-28X (GS728TX) - ProSAFE S3300 Smart Switch Series 관리자 가이드
Configuring Switching
134
S3300 Smart Switch
CST Configuration
Use the CST Configuration screen to configure Common Spanning Tree (CST) and Internal
Spanning Tree on the switch.
Spanning Tree on the switch.
To configure CST settings:
1.
Select Switching
STP
Advanced
CST Configuration.
2.
Specify values for CST in the appropriate fields:
•
Bridge Priority. When switches or bridges are running STP, each is assigned a
priority. After exchanging BPDUs, the switch with the lowest priority value becomes
the root bridge. Specifies the bridge priority value for the Common and Internal
Spanning Tree (CST). The valid range is 0–61440. The bridge priority is a multiple of
4096. If you specify a priority that is not a multiple of 4096, the priority is automatically
set to the next lowest priority that is a multiple of 4096. For example, if the priority is
attempted to be set to any value between 0 and 4095, it will be set to 0. The default
priority is 32768.
priority. After exchanging BPDUs, the switch with the lowest priority value becomes
the root bridge. Specifies the bridge priority value for the Common and Internal
Spanning Tree (CST). The valid range is 0–61440. The bridge priority is a multiple of
4096. If you specify a priority that is not a multiple of 4096, the priority is automatically
set to the next lowest priority that is a multiple of 4096. For example, if the priority is
attempted to be set to any value between 0 and 4095, it will be set to 0. The default
priority is 32768.
•
Bridge Max Age (secs). Specify the bridge maximum age time for the Common and
Internal Spanning Tree (CST), which indicates the amount of time in seconds a bridge
waits before implementing a topological change. The valid range is 6–40, and the
value must be less than or equal to (2 * Bridge Forward Delay) – 1 and greater than or
equal to 2 * (Bridge Hello Time +1). The default value is 20.
Internal Spanning Tree (CST), which indicates the amount of time in seconds a bridge
waits before implementing a topological change. The valid range is 6–40, and the
value must be less than or equal to (2 * Bridge Forward Delay) – 1 and greater than or
equal to 2 * (Bridge Hello Time +1). The default value is 20.
•
Bridge Hello Time (secs). Specify the switch Hello time for the Common and Internal
Spanning Tree (CST), which indicates the amount of time in seconds a root bridge
waits between configuration messages. The value is fixed at 2 seconds.
Spanning Tree (CST), which indicates the amount of time in seconds a root bridge
waits between configuration messages. The value is fixed at 2 seconds.
•
Bridge Forward Delay (secs). Specify the switch forward delay time, which indicates
the amount of time in seconds a bridge remains in a listening and learning state
before forwarding packets. The value must be greater or equal to (Bridge Max Age /
2) + 1. The time range is from 4 seconds to 30 seconds. The default value is 15.
the amount of time in seconds a bridge remains in a listening and learning state
before forwarding packets. The value must be greater or equal to (Bridge Max Age /
2) + 1. The time range is from 4 seconds to 30 seconds. The default value is 15.
Root Port
Port to access the Designated Root for the CST.
Max Age (secs)
Specifies the bridge maximum age for CST. The value must be less
than or equal to (2 X Bridge Forward Delay) – 1 and greater than or
equal to 2 X (Bridge Hello Time +1).
than or equal to (2 X Bridge Forward Delay) – 1 and greater than or
equal to 2 X (Bridge Hello Time +1).
Forward Delay (secs)
Derived value of the Root Port Bridge Forward Delay parameter.
Hold TIme (secs)
Minimum time between transmission of Configuration BPDUs.
CST Regional Root
Priority and base MAC address of the CST regional root.
CST Path Cost
Path Cost to the CST tree regional root.
Table 44. STP status information (continued)
Field
Description