Reference Guide

616 | Multiple Spanning Tree Protocol (MSTP)
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Figure 32-8. Configuring EdgePort
Flushing MAC Addresses after a Topology Change
Dell Networking OS has an optimized MAC address flush mechanism for RSTP, MSTP, and PVST+ that
flushes addresses only when necessary, which allows for faster convergence during topology changes.
However, you may activate the flushing mechanism defined by 802.1Q-2003 using the command
tc-flush-standard, which flushes MAC addresses upon every topology change notification. View the enable
status of this feature using the command
show running-config spanning-tree mstp from EXEC Privilege mode.
MSTP Sample Configurations
The running-configurations in Figure 32-10, Figure 32-11, and Figure 32-11 support the topology shown
in Figure 32-9. The configurations are from Dell Networking OS systems. An S50 system using SFTOS,
configured as shown Figure 32-13, could be substituted for an Dell Networking OS router in this sample
following topology and MSTP would function as designed.
Figure 32-9. MSTP with Three VLANs Mapped to Two Spanning Tree Instances
Dell(conf-if-te-3/41)#spanning-tree mstp edge-port
Dell(conf-if-te-3/41)#show config
!
interface TenGigabiEthernet 3/41
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
Dell(conf-if-te-3/41)#
R1
R2
R3
1/2
3/1
3/2
1/3
2/1
2/3
root
Forwarding
Blocking