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MST instances 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)
Boundary: No, Bpdu-filter: Enable, Bpdu-Guard: Enable, Shutdown-on-Bpdu-Guard-violation:
Yes
Root-Guard: Enable, Loop-Guard: Disable
Bpdus (MRecords) Sent: 6, Received: 6410
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID
PortID
-----------------------------------------------------------------------------------------
----
ethernet1/1/7 128.56 128 500 FWD 500 32769 90b1.1cf4.a625
128.56
590
Layer 2