Operation Manual

STP Commands
Mobility System Software Command Reference Guide
Version 7.3
13 – 366
See Also show spantree blockedports on page 13-367
show spantree backbonefast
Indicates whether the STP backbone fast convergence feature is enabled or disabled.
Syntax show spantree backbonefast
Defaults None.
Access All.
History Introduced in MSS Version 1.0.
Examples The following example shows the command output on an MX with backbone fast
convergence enabled:
MX# show spantree backbonefast
Backbonefast is enabled
Port Port number.
Note: Only network ports are listed. STP does not apply to MP ports or wired
authentication ports.
Vlan VLAN ID.
STP-State
or
Port-State
STP state of the port:
❑ Blocking—The port is not forwarding Layer 2 traffic but is listening to and
forwarding STP control traffic.
❑ Disabled—This state can indicate any of the following conditions:
• The port is inactive.
• The port is disabled.
• STP is enabled on the port but the port is not forwarding traffic. (The
port is active and enabled but STP has just started to come up.)
❑ Forwarding—The port is forwarding Layer 2 traffic.
❑ Learning—The port is learning the locations of other devices in the
spanning tree before changing state to forwarding.
❑ Listening—The port is comparing its own STP information with
information in STP control packets received by the port to compute the
spanning tree and change state to blocking or forwarding.
❑ STP Off—STP is disabled on the port.
Cost STP cost of the port.
Prio STP priority of the port.
Portfast State of the uplink fast convergence feature:
❑ Enabled
❑ Disabled
Table 13– 1. Output for show spantree (continued)
Field Description