Dell PowerSwitch S4128F-ON EMC SmartFabric OS10 User Guide Release 10.5.0 - Page 458

Debug facilities Use the debug spanning-tree bpdu command to monitor and verify that the MST configuration is communicating as configured. To ensure all necessary parameters match - region name, region version, and VLAN to instance mapping, examine your individual devices. Use the show spanning-tree mst command to view the MST configuration, or use the show runningconfiguration command to view the overall MST configuration. MST flags for communication received from the same region MST region name and revision MST instances The MST routers are located in the same region. If the debug logs indicate that packets are coming from a Different Region, one of the key parameters does not match. The configured name and revisions must be identical among all devices. If the region name is blank, a name was configured on one device and was not configured or was configured differently on another - spelling and capitalization count. Verify the VLAN-to-MST instance mapping using the show commands. If you see extra MST instances in the Sending or Received logs, an additional MST instance was configured on one router but not the others. • View BPDUs in EXEC mode. debug spanning-tree bpdu • View MST-triggered topology change messages in EXEC mode. debug spanning-tree events View MST configuration OS10# show spanning-tree mst configuration Region Name: force10 Revision: 100 MSTI VID 0 1,31-4093 1 2-10 2 11-20 3 21-30 EdgePort EdgePort allows the interface to forward traffic approximately 30 seconds sooner as it skips the Blocking and Learning states. CAUTION: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on an interface connected to a network. Edge ports do not receive BPDUs. NOTE: Whenever a port becomes a designated port, it will start a timer called the edge delay while timer (hello-time + 1/2 * hello-time); if the hello-time is set to 2 seconds, the edge delay while timer is 3 seconds. If BPDUs are not received for 3 seconds, then the port is declared as oper edge on the fly and is moved to forwarding state. OS10 supports auto edge feature . If the port does not receive BPDU for the hello-time + one second interval then it places the port into auto edge mode. If the edge port receives any BPDU, it looses the edge port property. • Enable EdgePort on an interface in INTERFACE mode. spanning-tree port type edge Configure EdgePort OS10(conf-if-eth1/1/4)# spanning-tree port type edge View interface status os10# show spanning-tree interface ethernet 1/1/7 ethernet1/1/7 of vlan 1 is Designated Forwarding Edge port: No (default) Link type: point-to-point (auto) 458 Layer 2