Brocade Communications Systems 53-1002163-02 manual Mstp overview

MSTP overview 7

switch(conf-rstp)#hello-time 5

10.Set the method for flushing mac-addresses in FDB, either according to the IEEE standard or the propriety standard. For details, see “Flushing MAC addresses (RSTP and MSTP)” on page 71.

switch(config)#spanning-tree tc-flush-standard

11.Enable PortFast on switch ports using the spanning-tree edgeport command. For details, see “Enabling port fast (STP)” on page 75. Note that this step is optional.

NOTE

Edgeport only needs to be enabled on ports that connect to workstations or PCs. Repeat these commands for every port connected to workstations or PCs. Do not enable edgeport on ports that connect to other switches.

switch(config)#interface tengigabitethernet 0/10 switch(conf-if-te-0/10)#spanning-tree edgeport switch(conf-if-te-0/10)#exit switch(config)#interface tengigabitethernet 0/11 switch(conf-if-te-0/11)#spanning-tree edgeport switch(conf-if-te-0/11)#exit

Repeat these commands for every port connected to workstations or PCs.

12.Enable the guard root feature with the spanning-tree guard root command. The guard root feature provides a way to enforce the root bridge placement in the network. For detailed information, refer to“Enabling the guard root” on page 73. Note that this step is optional.

Switch ports that recieve superior BPDUs are automatically placed in blocking mode.

This does not apply to ports connected to workstations or PCs; these ports remain in the forwarding state.

13.Enter the copy command to save the running-configfile to the startup-configfile.

switch(conf-if-te-0/1)#do copy running-config startup-config

MSTP overview

The IEEE 802.1s Multiple STP (MSTP) helps create multiple loop-free active topologies on a single physical topology. MSTP enables multiple VLANs to be mapped to the same spanning tree instance (forwarding path), which reduces the number of spanning tree instances needed to support a large number of VLANs. Each MSTP instance has a spanning tree topology independent of other spanning tree instances. With MSTP you can have multiple forwarding paths for data traffic. A failure in one instance does not affect other instances. With MSTP, you are able to more effectively utilize the physical resources present in the network and achieve better load balancing of VLAN traffic.

NOTE

In MSTP mode, RSTP is automatically enabled to provide rapid convergence.

Multiple switches must be configured consistently with the same MSTP configuration to participate in multiple spanning tree instances. A group of interconnected switches that have the same MSTP configuration is called an MSTP region.

Converged Enhanced Ethernet Administrator’s Guide	61
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