Brocade Communications Systems 53-1001761-01 Manual De Usuario
46
Converged Enhanced Ethernet Administrator’s Guide
53-1001761-01
RSTP overview
5
DRAFT: BROCADE CONFIDENTIAL
With RSTP, the port roles for the new interface states are also different. RSTP differentiates
explicitly between the state of the port and the role it plays in the topology. RSTP uses the root port
and designated port roles defined by STP, but splits the blocked port role into backup port and
alternate port roles:
explicitly between the state of the port and the role it plays in the topology. RSTP uses the root port
and designated port roles defined by STP, but splits the blocked port role into backup port and
alternate port roles:
•
Backup port—Provides a backup for the designated port and can only exist where two or more
ports of the switch are connected to the same LAN; the LAN where the bridge serves as a
designated switch.
ports of the switch are connected to the same LAN; the LAN where the bridge serves as a
designated switch.
•
Alternate port—Serves as an alternate port for the root port providing a redundant path towards
the root bridge.
the root bridge.
Only the root port and the designated ports are part of the active topology; the alternate and
backup ports do not participate in it.
backup ports do not participate in it.
When the network is stable, the root and the designated ports are in the forwarding state, while the
the alternate and backup ports are in the discarding state. When there is a topology change, the
new RSTP port roles allow a faster transition of an alternate port into the forwarding state.
the alternate and backup ports are in the discarding state. When there is a topology change, the
new RSTP port roles allow a faster transition of an alternate port into the forwarding state.
For more information on RSTP, see
Configuring RSTP on Brocade FCoE hardware
The basic process for configuring RSTP on your Brocade FCoE hardware is as follows.
1. Enter Global Configuration mode.
2. Enable RSTP using the global protocol spanning-tree command. For details, see
switch(config)#protocol spanning-tree rstp
3. Designate the root switch using the bridge-priority command. For details, see
on page 52. The range is 0 through 61440 and the priority values can be set
only in increments of 4096.
switch(conf-stp)#bridge-priority 28582
4. Configure the bridge forward delay value. For details, see
switch(conf-stp)#forward-delay 20
5. Configure the bridge maximum aging time value. For details, see
switch(conf-stp)#max-age 25
6. Enable the error disable timeout timer value. For details, see
switch(conf-stp)#error-disable-timeout enable
7. Configure the error-disable-timeout interval value. For details, see
8.
switch(conf-stp)#error-disable-timeout interval 60
switch(conf-stp)#port-channel path-cost custom