Users Guide

Table Of Contents
Layer 2 Switching Commands 833
User Guidelines
IRC can be configured even if the switch is configured for MST(RSTP) or
RSTP-PV mode. It only has an effect when the switch is configured for
STP-PV mode.
If an IRC-enabled switch receives an inferior BPDU from its designated
switch on a root or blocked port, it sets the maximum aging time on the
interfaces on which it received the inferior BPDU if there are alternative
(blocked) paths to the designated switch. This allows a blocked port to
immediately move to the listening state where the port can be transitioned to
the forwarding state in the normal manner.
Example
console(config)#spanning-tree backbonefast
spanning-tree bpdu flooding
The spanning-tree bpdu flooding command allows flooding of BPDUs
received on non-spanning-tree ports to all other non-spanning-tree ports. Use
the “no” form of the command to disable flooding.
Syntax
spanning-tree bpdu flooding
no spanning-tree bpdu flooding
Default Configuration
This feature is disabled by default.
Command Mode
Global Configuration mode
User Guidelines
There are no user guidelines for this command.
Example
console#spanning-tree bpdu flooding