Setting The Mstp Global Parameters; Setting Ports To Be Operational Edge Ports; Setting Point-To-Point Link - Dell PowerConnect B-RX Configuration Manual

You can set a priority to the instance that gives it forwarding preference over lower priority
instances within a VLAN or on the switch. A higher number for the priority variable means a lower
forwarding priority. Acceptable values are 0 - 61440 in increments of 4096. The default value is
32768.

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.
BigIron RX(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>
The force-version parameter forces the bridge to send BPDUs in a specific format. You can specify
one of the following <mode-number> values:
•
•
•
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.
BigIron RX(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.
BigIron RX Series Configuration Guide
53-1002253-01
max-age <value> max-hops <value>
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.
802.1s Multiple Spanning Tree Protocol
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