Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 389)

Multi-Service IronWare Switching Configuration Guide 359
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802.1s Multiple Spanning Tree Protocol
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Setting the MSTP global parameters
MSTP has many of the options available in RSTP as well as some unique options. To configure
MSTP Global parameters for all instances on a device.
Brocade(config)# mstp force-version 0 forward-delay 10 hello-time 4 max-age 12
max-hops 9
Syntax: [no] mstp force-version mode-number forward-delay value hello-time value max-age value
max-hops value
The force-version parameter forces the bridge to send BPDUs in a specific format. You can specify
one of the following mode-number values:
• 0 – The STP compatibility mode. Only STP BPDUs will be sent. This is equivalent to single STP.
• 2 – The RSTP compatibility mode. Only RSTP BPDUS will be sent. This is equivalent to single
STP.
• 3 – MSTP mode. In this default mode, only MSTP BPDUS will be sent.
The forward-delay value specifies how long a port waits before it forwards an RST BPDU after a
topology change. This can be a value from 4 – 30 seconds. The default is 15 seconds.
The hello-time value parameter specifies the interval between two hello packets. The parameter
can have a value from 1 – 10 seconds. The default is 2 seconds.
The max-age value parameter specifies the amount of time the device waits to receive a hello
packet before it initiates a topology change. You can specify a value from 6 – 40 seconds. The
default value is 20 seconds.
The max-hops value parameter specifies the maximum hop count. You can specify a value from 1 –
40 hops. The default value is 20 hops.
Setting ports to be operational edge ports
You can define specific ports as edge ports for the region in which they are configured to connect to
devices (such as a host) that are not running STP, RSTP, or MSTP. If a port is connected to an end
device such as a PC, the port can be configured as an edge port. To configure ports as operational
edge ports enter a command such as the following.
Brocade(config)# mstp admin-edge-port ethernet 3/1
Syntax: [no] mstp admin-edge-port ethernet slot/port
The slot/port parameter specifies a port or range of ports as edge ports in the instance they are
configured in.
Setting point-to-point link
You can set a point-to-point link between ports to increase the speed of convergence. To create a
point-to-point link between ports, use a command such as the following at the Global Configuration
level.
Brocade(config)# mstp admin-pt2pt-mac ethernet 2/5 ethernet 4/5
Syntax: [no] mstp admin-pt2pt-mac ethernet slot/port