Rstp Information - Lenovo RackSwitch G8264 Command Reference Manual

RSTP Information

Spanning Tree Group 1: On (RSTP)
VLANs: 1 10 4095
Current Root: Path­Cost Port Hello MaxAge FwdDel
8000 00:25:03:49:29:00 0 0 2 20 15
Parameters: Priority Hello MaxAge FwdDel Aging Topology Change Counts
32768 2 20 15 300 1
Port Prio Cost State Role Designated Bridge Des Port Type
­­­­­­­­­­­ ­­­­ ­­­­ ­­­­­ ­­­­ ­­­­­­­­­­­­­­­­­­­­­­ ­­­­­­­­ ­­­­­­
1 (pc12) 128 490!+ FWD DESG 8000­00:25:03:49:29:00 8026 P2P
2 (pc12) 128 490!+ FWD DESG 8000­00:25:03:49:29:00 8026 P2P
3 (pc12) 128 490!+ FWD DESG 8000­00:25:03:49:29:00 8026 P2P
4 (pc12) 128 490!+ FWD DESG 8000­00:25:03:49:29:00 8026 P2P
MGT 0 0 FWD *
* = STP turned off for this port.
! = Automatic path cost.
+ = Portchannel cost, not the individual port cost.
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G8264 Command Reference for ENOS 8.4
The following command displays RSTP information:
show spanning­tree stp <1> information
Command mode: All
The switch software uses the Per VLAN Rapid Spanning Tree Protocol (PVRST)
spanning tree mode, with IEEE 802.1D (2004) Rapid Spanning Tree Protocol (RSTP)
or IEEE 802.1Q (2003) Multiple Spanning Tree Protocol (MSTP), as alternatives.
The following port‐specific information is also displayed:
Table 31.
PVRST/RSTP/MSTP Port Parameter Descriptions
Parameter Description
Priority The Port Priority parameter helps determine which bridge port
(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 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 one of the following: Discarding (DISC), Learning (LRN), or
Forwarding (FWD).
Role The Role field 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) or Backup (BKUP).