Command Reference Guide

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The following table describes the CIST parameters.
Table 24 Common Internal Spanning Tree parameter descriptions
Parameter
Description
CIST Root
Shows information about the root bridge for the Common Internal
Spanning Tree (CIST). Values on this row of information refer to the CIST
root.
CIST Regional Root
Shows information about the root bridge for this MSTP region. Values on this
row of information refer to the regional root.
Priority (bridge)
The bridge priority parameter controls which bridge on the network will
become the STP root bridge.
MaxAge
The maximum age parameter specifies, in seconds, the maximum time the
bridge waits without receiving a configuration bridge protocol data unit
before it reconfigures the STP network.
FwdDel
The forward delay parameter specifies, in seconds, the amount of time
that a bridge port has to wait before it changes from learning state to
forwarding state.
Hops
Shows the maximum number of bridge hops allowed before a packet is
dropped.
Priority (port)
The port priority parameter helps determine which bridge port becomes
the designated port. In a network topology that has multiple bridge ports
connected to a single segment, the port with the lowest port priority
becomes the designated port for the segment.
Cost
The port path cost parameter is used to help determine the designated
port for a segment. Generally speaking, the faster the port, the lower the
path cost. A setting of zero (0) indicates that the cost will be set to the
appropriate default after the link speed has been auto-negotiated.
State
Shows the current state of the port. The state field can be one of the
following: Discarding (DISC), Learning (LRN), Forwarding
(FWD), or Disabled (DSB).
Role
Shows the current role of this port in the Spanning Tree. The port role can
be one of the following: Designated (DESG), Root (ROOT), Alternate
(ALTN), Backup (BKUP), Master (MAST), or Unknown (UNK).
Designated Bridge
Shows information about the bridge connected to each port, if
applicable. Information includes the priority (hex) and MAC address of the
Designated Bridge.
Designated Port
The port ID of the port on the Designated Bridge to which this port is
connected. Information includes the port priority (hex) and the port
number (hex).
Hello
The hello time parameter specifies, in seconds, how often the root bridge
transmits a configuration bridge protocol data unit (BPDU). Any bridge that
is not the root bridge uses the root bridge hello value.
Type
Type of link connected to the port, and whether the port is an edge port.
Link type values are AUTO, P2P, or SHARED.
Trunk group information
Command: /info/l2/trunk
Trunk group 1, Enabled
port state:
20: STG 1 forwarding
21: STG 1 forwarding
When trunk groups are configured, you can view the state of each port in the various trunk groups.
NOTE: If Spanning Tree Protocol on any port in the trunk group is set to forwarding, the remaining
ports in the trunk group will also be set to forwarding.