Dell 6200 manual Control Packet Behavior, Mstp Cli Commands, April, show spanning-tree

MSTP INTEROPERABILITY OF THE DELL™ POWERCONNECT™ 6200 SERIES SWITCHES WITH CISCO IOS AND CISCO CATOS-BASED SWITCHES

CONTROL PACKET BEHAVIOR

BPDU: Always transmitted as untagged. The port receives and transmits BPDUs in all three

MSTP states: Discarding, Learning and Forwarding. If MSTP is disabled for the device (manual forwarding on all ports), BPDUs received are switched.

GVRP: Always transmitted as untagged. GVRP PDUs are received and transmitted only when the port is in Forwarding state.

GMRP: GMRP PDUs are transmitted tagged or untagged as per the port’s tag setting. They follow the ingress and egress rules.

LACPDU: LACPDUs are always transmitted untagged and are received and transmitted in all three MSTP states. These frames are never switched whether MSTP is enabled or not.

Pause Frames: Pause frames are never tagged or switched. The port receives and transmits Pause frames in all three MSTP states. In other words, the STP state of the port has no bearing on the transmission and reception of Pause Frames.

Other Frames to and from the CPU: All other frames are received and transmitted only if the port is in Forwarding state.

All BPDUs (ST, TCN, RST, MST, etc.) use the unique MAC address of the transmitting port in their Source MAC address field and comply with IEEE Std. 802.1D-2004 sub-clauses 7.12 and 7.13.

The unique MAC address for a stacking switch is the base MAC address of the stack unit plus the port number.

MSTP CLI COMMANDS

You can configure MSTP on the Dell PowerConnect 62xx series switch by using the Web interface or the Command-Line Interface (CLI). The following spanning tree and MSTP CLI commands are available:

spanning-tree spanning-tree mode spanning-tree forward-time spanning-tree hello-time spanning-tree max-age spanning-tree priority spanning-tree disable spanning-tree cost spanning-tree port-priority spanning-tree portfast spanning-tree link-type

clear spanning-tree detected-protocols spanning-tree mst priority spanning-tree mst max-hops spanning-tree mst port-priority spanning-tree mst cost spanning-tree mst configuration instance (mst)

name (mst) revision (mst) show (mst) exit (mst) abort (mst)

show spanning-tree

For more information about each command, including the syntax and variables, see the Dell PowerConnect 62xx System CLI Command Reference.

Configure MSTP by using the Web interface on the pages under the Switching > Spanning Tree menu.

APRIL 2008 6