7.8.1.0 - Force10 Networks

Figure 317
Configuring EdgePort
R1(conf-if-gi-3/41)#spanning-tree mstp edge-port
R1(conf-if-gi-3/41)#show config
!
interface GigabitEthernet 3/41
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
R1(conf-if-gi-3/41)#
Flush MAC Addresses after a Topology Change
FTOS has an optimized MAC address flush mechanism for MSTP that flushes only when necessary which
allows for faster convergence during topology changes. However, you may use 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 319, Figure 320, and Figure 320 support the topology shown in
Figure 318. The configurations are from FTOS systems. An S50 system using SFTOS, configured as
shown Figure 322, could be substituded for an FTOS router in this sample following topology and MSTP
would function as designed.
Figure 318 MSTP with Three VLANs Mapped to Two Spanning Tree Instances
MSTI 2 root
1/31
Blocking
3/11
R1 R2
R3
Forwarding
1/21
3/21
VLAN 100
VLAN 200
VLAN 300
492 Multiple Spanning Tree Protocol
2/11
2/31
MSTI 1 root