Nortel Networks BMD00007 User Manual
Alteon OS Command Reference
92
The Information Menu
BMD00007, November 2007
You can view port-specific CIST information, including the following:
Port number and priority
Cost
Link type and Port type
The following table describes the CIST parameters.
Table 4-21 CIST Parameter Descriptions
Parameter
Description
CIST Root
The 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.
Internal Spanning Tree (CIST). Values on this row of information refer to the
CIST root.
CIST Regional Root
The CIST Regional Root shows information about the root bridge for this
MSTP region. Values on this row of information refer to the regional root.
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.
become the STP root bridge.
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.
transmits a configuration bridge protocol data unit (BPDU). Any bridge that
is not the root bridge uses the root bridge hello value.
MaxAge
The maximum age parameter specifies, in seconds, the maximum time the
bridge waits without receiving a configuration bridge protocol data unit
before it reconfigure the STP network.
bridge waits without receiving a configuration bridge protocol data unit
before it reconfigure 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.
bridge port has to wait before it changes from learning state to forwarding
state.
priority
(port)
The port priority parameter helps determine which bridge port becomes the
designated port. In a network topology that has multiple bridge ports con-
nected to a single segment, the port with the lowest port priority becomes the
designated port for the segment.
designated port. In a network topology that has multiple bridge ports con-
nected 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 0 indicates that the cost will be set to the appropriate default after
the link speed has been auto negotiated.
a segment. Generally speaking, the faster the port, the lower the path cost. A
setting of 0 indicates that the cost will be set to the appropriate default after
the link speed has been auto negotiated.
State
The state field shows the current state of the port. The state field can be either
Discarding (DISC), Learning (LRN)
Discarding (DISC), Learning (LRN)
, or Forwarding
(FWD)
.