HP 438031-B21 - 1:10Gb Ethernet BL-c Switch Command Reference Manual page 47

The following table describes the CIST parameters.
Common Internal Spanning Tree parameter description
Table 24
Parameter
CIST Root
CIST Regional Root
Priority (bridge)
MaxAge
FwdDel
Hops
Priority (port)
Cost
State
Role
Designated Bridge
Designated Port
Hello
Type
Description
Shows information about the root bridge for the Common Internal Spanning Tree (CIST).
Values on this row of information refer to the CIST root.
Shows information about the root bridge for this MSTP region. Values on this row of
information refer to the regional root.
The bridge priority parameter controls which bridge on the network will become the STP
root bridge.
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.
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.
Shows the maximum number of bridge hops allowed before a packet is dropped.
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.
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.
Shows the current state of the port. The state field can be one of the following:
Discarding (DISC), Forwarding (FWD), or Disabled (DSB).
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).
Shows information about the bridge connected to each port, if applicable. Information
includes the priority (hex) and MAC address of the Designated Bridge.
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).
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 of link connected to the port, and whether the port is an edge port. Link type
values are AUTO, P2P, or SHARED.
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