Configuration Guide User guide

342 BigIron RX Series Configuration Guide
53-1002484-04
IEEE Single Spanning Tree (SSTP)
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STP Port Parameters:
Port Prio Path State Designat- Designated Designated
Num rity Cost ed Cost Root Bridge
1/9 128 4 BLOCKING 4 03e8001020010000 07d0000cdbfab700
Syntax: show spanning-tree blocked [ethernet <interface-id> | vlan <vlan-id>]
The ethernet <interface-id> parameter displays blocked interfaces for the specified Ethernet
interface.
The vlan <vlan-id> parameter displays blocked interfaces for the specified port-based VLAN.
Table 80 describes the output parameters of the show spanning-tree blocked command.
IEEE Single Spanning Tree (SSTP)
By default, each port-based VLAN on the device runs a separate spanning tree, which you can
enable or disable on an individual VLAN basis.
Alternatively, you can configure the device to run a single spanning tree across all of its ports and
VLANs. The SSTP feature is especially useful for connecting a device to third-party devices that run
a single spanning tree in accordance with the 802.1q specification.
SSTP uses the same parameters, with the same value ranges and defaults, as the default STP
supported on the device. Refer to “Default STP bridge and port parameters” on page 329.
TABLE 80 Output parameters of the show spanning-tree blocked command
Field Description
STP Port Parameters
Port Num The port number.
Priority The priority value of the port.
Path Cost The port’s STP path cost.
State The port’s STP state. A port can have one of the following states:
• Blocking
• Disabled
• Forwarding
• Listening
• Learning
Designated Cost The cost to the root bridge as advertised by the designated bridge that is
connected to this port. If the designated bridge is the root bridge itself,
then the cost is 0.
Designated Root The root bridge as recognized on this port.
Designated Bridge The bridge as recognized on this port.