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Spanning Tree Algorithm Configuration
3-119
through the bridge to the root bridge (i.e.,
designated
port)or is an
alternate
or
backup
port that may provide connectivity if other bridges, bridge ports, or LANs
fail or are removed. The role is set to disabled (i.e.,
disabled
port) if a port has no
role within the spanning tree.
•
Trunk Member
– Indicates if a port is a member of a trunk.
(STA Port Information only)
These additional parameters are only displayed for the CLI:
•
Admin status
– Shows if this interface is enabled.
•
Path cost
– The path cost for the IST. This parameter is used by the STA 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. (Path cost takes precedence over port priority.)
•
Priority
– Defines the priority used for this port in the Spanning Tree Algorithm. If
the path cost for all ports on a switch is the same, the port with the highest priority
(i.e., lowest value) will be configured as an active link in the Spanning Tree. This
makes a port with higher priority less likely to be blocked if the Spanning Tree
Algorithm is detecting network loops. Where more than one port is assigned the
highest priority, the port with the lowest numeric identifier will be enabled.
•
Designated root
– The priority and MAC address of the device in the Spanning
Tree that this switch has accepted as the root device.
•
Fast forwarding
– This field provides the same information as Admin Edge port,
and is only included for backward compatibility with earlier products.
•
Admin Edge Port
– You can enable this option if an interface is attached to a LAN
segment that is at the end of a bridged LAN or to an end node. Since end nodes
cannot
cause forwarding loops, they can pass directly through to the spanning tree
forwarding state. Specifying Edge Ports provides quicker convergence for devices
Alternate port receives more
useful BPDUs from another
bridge and is therefore not
selected as the designated
port.
x
R: Root Port
A: Alternate Port
D: Designated Port
B: Backup Port
R
R
A
D
B
Backup port receives more
useful BPDUs from the same
bridge and is therefore not
selected as the designated
port.
x
R
R
A
D
B
Summary of Contents for 8124PL2
Page 1: ...MANAGEMENT GUIDE TigerSwitchTM 10 100 1000 24 Port Managed Switch with PoE SMC8124PL2 ...
Page 2: ......
Page 20: ...xvi Contents ...
Page 27: ...xxiii Figures ...
Page 35: ...Introduction 1 8 1 ...
Page 45: ...Initial Configuration 2 10 2 ...
Page 148: ...Port Configuration 3 103 Figure 3 61 Displaying Etherlike and RMON Statistics ...
Page 473: ...Command Line Interface 4 240 4 ...
Page 477: ...Software Specifications A 4 A ...
Page 489: ...Index Index 4 menu list 3 3 panel display 3 3 ...
Page 490: ......