Dell 6200 manual April, Multiple MSTP Regions

Page 24
Figure 7: Multiple MSTP Regions

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

Figure 7: Multiple MSTP Regions

In Figure 8, a third region has been added to the topology. Even though this new region only consists of one bridge and has an MST Configuration Identifier that matches the bridges in Region 1, it will still be isolated into a region by itself. This is due to the fact that the only connection between Region 1 and Region 3 is through a different region.

The path of a frame for VLAN 20 can be traced through the MST active topology. A frame originating on an end station on bridge BrA in Region 1 will traverse the MSTI 2 active topology since its VID has been allocated to that instance. In looking for a destination match with a device in Region 3, it will pass through the boundary port in bridge BrC and continue through Region 2 using the instance MSTI 1. Assuming that port Pt2 on both bridge BrA2 and BrB2 are forwarding for the MSTI 1, the frame would arrive at the boundary port on bridge BrB2 and then be sent to Region 3. Upon arriving in Region 3, the frame would traverse MSTI 2 to the destination device.

APRIL 2008

24

Page 23 Page 25
Image 24
Page 23 Page 25
Contents Information in this document is subject to change without notice MSTP INTEROPERABILITY OF THE DELL POWERCONNECT 6200 SERIES SWITCHESWITH CISCO IOS OR CISCO CATOS BASED SWITCHES CONTENTS VOICE VLAN CONFIGURATIONCLI CONFIGURATION WEB CONFIGURATIONDELL POWERCONNECT 62XX MSTP FUNCTIONAL DESCRIPTION APRILAdmin Port State STP Port StateMSTP Port State Active TopologyACTIVE TOPOLOGY ENFORCEMENT Figure 2 Example FID to MSTI AllocationFigure 3 Example Resultant VID to MSTI Allocation MSTP CLI COMMANDS CONTROL PACKET BEHAVIORshow spanning-tree OPERATION IN THE NETWORK Figure 4 Small Bridged NetworkFigure 5 Single STP Topology Figure 6 Logical MSTP Environment SAMPLE SETUP AND CONFIGURATIONS CONFIGURING BRIDGE BrA CLICommand DescriptionCONFIGURING BRIDGE BrA WEB INTERFACE APRIL APRIL APRIL 10. Click Apply Changes 12. Click Show All to access the MSTP Settings Table CONFIGURING BRIDGE BrB CONFIGURING BRIDGE BrCCONFIGURING EDGE DEVICES show spanning-tree mst configuration Bridge BrA Dell Bridge BrB DellBridge BrC Cisco ADDITIONAL MSTP STATUS INFORMATIONPriority APRIL Bridge BrA DellAPRIL ADDITIONAL INFORMATION AND SCALABILITY WITH MORE REGIONS Figure 7 Multiple MSTP Regions Figure 8 Multiple MSTP Region Interactions
Top Page Image Contents