Cisco Cisco Small Business Unmanaged Switch SR2016, Руководство пользователя

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Chapter 5
Advanced Configuration
45
WebView Switches
Path Cost Default Values Specifies the method used to
assign default path costs to STP ports. The possible field
values are:
Short
•
Specifies a 1–65,535 range for port path costs.
This is the default value.
Long
•
Specifies a 1–200,000,000 range for port path
costs. The default path costs assigned to an interface
varies according to the selected method.
Bridge Settings
Priority Specifies the bridge priority value. When switches
or bridges are running STP, each is assigned a priority.
After exchanging BPDUs, the device with the lowest
priority value becomes the Root Bridge. The default value
is
32,768 . The port priority value is provided in increments
of 4096. For example, 4096, 8192, 12,288, and so on. The
range is
0–65,535 .
Hello Time Specifies the device Hello Time. The Hello
Time indicates the amount of time in seconds a root bridge
waits between configuration messages. The default is
2
seconds. The range is 1–10 seconds.
Max Age Specifies the device Maximum Age Time.
The Maximum Age Time indicates the amount of time
in seconds a bridge waits before sending configuration
messages. The default max age is
20 seconds. The range
is 6–40 seconds.
Forward Delay Specifies the device forward delay time.
The Forward Delay Time indicates the amount of time in
seconds a bridge remains in a listening and learning state
before forwarding packets. The default is
15 seconds. The
range is 4–30 seconds.
Spanning Tree > STP Port Settings
Network administrators can assign STP settings to specific
interfaces using the
STP Interface Settings screen.
Spanning Tree > STP Port Settings
The STP Interface Settings page contains the following
fields:
Interface Indicates the port or LAG on which STP is
enabled.
STP Indicates if STP is enabled on the port.
Port Fast Indicates if Fast Link is enabled on the port.
If Fast Link mode is enabled for a port, the Port State
is automatically placed in the Forwarding state when
the port link is up. Fast Link optimizes the STP protocol
convergence. STP convergence can take
30–60 seconds
in large networks.
Port State Displays the current STP state of a port. If
enabled, the port state determines what forwarding
action is taken on traffic. Possible port states are:
Disabled
•
Indicates that STP is currently disabled on
the port. The port forwards traffic while learning MAC
addresses.
Blocking
•
Indicates that the port is currently blocked
and cannot forward traffic or learn MAC addresses.
Blocking is displayed when Classic STP is enabled.
Listening
•
Indicates that the port is in Listening mode.
The port cannot forward traffic nor can it learn MAC
addresses.
Learning
• Indicates that the port is in Learning mode.
The port cannot forward traffic, however it can learn
new MAC addresses.
Forwarding
• Indicates that the port is in Forwarding
mode. The port can forward traffic and learn new MAC
addresses.
Speed
Indicates the speed at which the port is
operating.