Brocade Communications Systems 53-1001761-01 Manual De Usuario
Converged Enhanced Ethernet Administrator’s Guide
49
53-1001761-01
STP, RSTP, and MSTP configuration guidelines and restrictions
5
DRAFT: BROCADE CONFIDENTIAL
5. Map a VLAN to an MSTP instance using the instance command. For more details see
switch(conf-mstp)#instance 1 vlan 2, 3
switch(conf-mstp)#instance 2 vlan 4-6
switch(conf-mstp)#instance 1 priority 4096
6. Specify the maximum hops for a BPDU to prevent the messages from looping indefinitely on
the interface using the max-hops hop_count command. For more details see
switch(conf-mstp)#max-hops 25
7. Enter the copy command to save the running-config file to the startup-config file.
switch(conf-mstp)#exit
switch(config)#end
switch#copy running-config startup-config
For more information on MSTP, see
STP, RSTP, and MSTP configuration guidelines and restrictions
Follow these configuration guidelines and restrictions when configuring STP, RSTP, and MSTP:
•
You have to disable one form of xSTP before enabling another.
•
Packet drops or packet flooding may occur if you do not enable xSTP on all devices connected
on both sides of parallel links.
on both sides of parallel links.
•
LAGs are treated as normal links and by default are enabled for STP.
•
You can have 16 MSTP instances and one MSTP region.
•
Create VLANs before mapping them to MSTP instances.
•
The MSTP force-version option is not supported.
•
For load balancing across redundant paths in the network to work, all VLAN-to-instance
mapping assignments must match; otherwise, all traffic flows on a single link.
mapping assignments must match; otherwise, all traffic flows on a single link.
•
When you enable MSTP by using the global protocol spanning-tree mstp command, RSTP is
automatically enabled.
automatically enabled.
•
For two or more switches to be in the same MSTP region, they must have the same
VLAN-to-instance map, the same configuration revision number, and the same name.
VLAN-to-instance map, the same configuration revision number, and the same name.
•
Spanning Tree topologies must not be enabled on any direct server connections to the
front-end Ten Gigabit Ethernet ports that may run FCoE traffic. This may result in lost or
dropped FCoE logins.
front-end Ten Gigabit Ethernet ports that may run FCoE traffic. This may result in lost or
dropped FCoE logins.