M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
GarrettCom recommends that all your network devices be updated to support RSTP. RSTP
offers convergence times typically of less than one second. However, to make best use of RSTP
and achieve the fastest possible convergence times there are some changes that you should make
to the RSTP default configuration.
1.
GarrettCom Inc. provides downloadable software Fault Timing
Analyzer (FTA) for testing how quickly a network recovers from a
fault, once the redundancy feature such as STP or RSTP is configured
on the switches (bridges). This software can be downloaded from the
GarrettCom site. This software is available at
http://www.garrettcom.com/ftaform.htm
2.
Under some circumstances it is possible for the rapid state transitions
employed by RSTP to result in an increase in the rates of frame
duplication and the order in which the frames are sent and received. In
order to allow RSTP switches to support applications and protocols
that may be sensitive to frame duplication and out of sequence frames,
RSTP may have to be explicitly set to be compatible with STP. This
explicit setting is called setting the “Force Protocol Version”
parameter to be STP compatible
.
This parameter should be set to all
ports on a given switch
3.
As indicated above, one of the benefits of RSTP is the implementation
of a larger range of port path costs which accommodates higher
network speeds. New default values have also been implemented for
the path costs associated with the different network speeds. This could
create incompatibility between devices running the older
implementations of STP a switch running RSTP
4.
If you are using tagged VLANs, at least one untagged VLAN must be
available for the BPDU’s to propagate through the network to update
STP status.
5.
RSTP is needed for RS-Ring on the GarrettCom
Magnum 6K family of switches.
Configuring RSTP
The commands to setup and configure RSTP on MNS-6K are
Syntax
set stp type=<stp|rstp> -
Set the switch to support RSTP or change it back to STP. Need to save
and reboot the switch after this command
Syntax
rstp
– enter the RSTP configuration mode
Syntax
rstp <enable|disable>
- enable RSTP – by default, this is disabled and has to be manually
activated
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