Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring MSTP (Rev. 03)
Overview
© 2008 Foundry Networks, Inc
Page 35 of 70
By default, MSTP Link Flapping is disabled.
Command Syntax
device-name
(config-if
UU/SS/PP
)#
mstp link-flapping
<
period
>
device-name
(config-if
UU/SS/PP
)#
no mstp link-flapping
Argument Description
period
Control period in milliseconds to which the actual time between switching the
LinkDown and LinkUp port statuses is compared. Actual times shorter than the
control period set result in link shutdown. The valid values are in the range 200-10000
milliseconds (0.2 to 10 seconds).
Example 1
To set the MSTP Link Flapping control period to 1.5 seconds on interface 1/1/1:
device-name
(config)#
interface 1/1/1
device-name
(config-if 1/1/1)#
mstp link-flapping
1500
Example 2
To disable MSTP Link Flapping on interface range 1/1/1-1/1/8:
device-name
(config)#
interface range 1/1/1-1/1/8
device-name
(config-if
-
range)#
no mstp link-flapping
Setting MSTP Migration
The
mstp detect-protocols
command, in Interface Configuration mode, causes the port to switch
to RSTP mode.
The MST protocol supports two modes of operation on each port – RSTP and STP. These modes
enable migration and allow MSTP to communicate with legacy STP switches.
•
RSTP is the default protocol. In this mode, bridge protocol packets (BPDUs) are sent. BPDUs
support fast transition, enhance topology change and are compatible with MST and RST
protocols.
•
STP is the mode that allows the port to communicate with legacy switches that support the
IEEE 801.2D standard. Whenever a port receives an IEEE 801.2D packet it moves to STP
mode.
To cause a port to return from STP mode to the default RSTP mode you need to use the
mstp
detect-protocols
command.
The
mstp detect-protocols
command instructs MSTP to send the next BPDU as an MSTP/RSTP
BPDU. Note that the command does not restart the port, nor does it force a BPDU to be
immediately sent.
Command Syntax
device-name
(config-if
UU/SS/PP
)#
mstp detect-protocols