HOW TO PREVENT SPANTREE LOOPS IN CISCO SWITCHES?
October 30th, 2009
I wish to have certain which I do not get a spann-tree double back on dual ports in between dual switches. Will one automatically retard whilst the alternative forwards. How can I have sure?
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Categories: Cisco hardware
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You can also issue the set spantree portfast command, on a per-port basis. When you enable the portfast variable on a port, the port immediately switches from blocking mode to forwarding mode. Enablement of portfast helps to prevent timeouts on clients who use Novell Netware or use DHCP in order to obtain an IP address. However, do not use this command when you have switch-to-switch connection. In this case, the command can result in a loop. The 30- to 60-second delay that occurs during the transition from blocking to forwarding mode prevents a temporal loop condition in the network when you connect two switches.
Leave most other STP variables at their default values.