Allen-Bradley Stratix 8000 User Manual

Rockwell Automation Publication 1783-UM007G-EN-P - February 2017 363
Configure Switch Features Chapter 7
PortFast Settings
To enable PortFast and related features, click the PortFast tab. On the PortFast
tab, you can change the way that STP is implemented on individual ports.
PortFast features are typically enabled only on access ports. Access ports
connect to devices such as personal computers, access points, and servers that
are not expected to send bridge protocol data units (BPDUs). These features
are typically not enabled on ports that connect to switches because spanning
tree loops can occur.
BPDU Features
Switches exchange special frames that are called BPDUs to communicate
network information, to track changes, and to create the STP topology.
Because transmitted BPDUs reveal network information and received BPDUs
can influence your STP topology, consider enabling BPDU Filtering and
BPDU Guard on your access ports. These features prevent a rogue device from
interfering with your STP topology. However, we recommend you use these
features with caution:
• BPDU Filtering—This PortFast feature blocks all sending and receiving
of BPDUs through all PortFast-enabled ports. This feature effectively
disables STP on these ports and loops can result. If a BPDU is received,
PortFast is disabled on the port and the global STP settings apply. To
enable BPDU Filtering on all PortFast-enabled ports, check Enable.
• BPDU Guard—This PortFast feature shuts down a port if it receives a
BPDU. To enable BPDU Guard on all Port Fast-enabled ports, check
Enable.
If you enable both of these features, BPDU Guard has no effect because BPDU
Filtering prevents the port from receiving any BPDUs.

Allen-Bradley Stratix 8000 Specifications

General

Brand	Allen-Bradley
Model	Stratix 8000
Category	Switch
Language	English