Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 337)

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 switch.
device(config)#mstp force-version 0 forward-delay 10 hello-time 4 max-age 12 max-hops
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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, where the value
adheres to the following formula.
max age equal to or greater than 2 x (hello-time + 1) AND max age equal to or greater than 2 x
(forward-delay - 1)
The default max-age 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.
device(config)#mstp admin-edge-port ethernet 3/1
Syntax: [no] mstp admin-edge-port ethernet port
Setting automatic operational edge ports
You can configure a Layer 3 switch to automatically set a port as an operational edge port if the port
does not receive any BPDUs since link-up. If the port receives a BPDU later, it is automatically reset to
become an operational non-edge port. This feature is set globally to apply to all ports on a router where
it is configured. This feature is configured as shown in the following.
device(config)#mstp edge-port-auto-detect
Syntax: [no] mstp edge-port-auto-detect
Setting the MSTP global parameters
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 337
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