Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations Chriss Miller on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
PortFast on EtherChannel Ports ?
- Thread starter chazk1
- Start date
Don't turn portfast on these ports.
Portfast tell the switch to bring up the port, before it finishes the spanning-tree process.
If a switch connection comes up before the spanning-tree process, there could be a loop in your network. Spanning-tree allows you to have physical loops (one active and the rest disabled). If you bring the connection up, before spanning-tree knows about it you'll have a loop. When a loop happens, packets will ride the network mary-go-round.
It's good network design to have a physical network loop, but spanning-tree keeps the network loop free. Hope this makes sense.
Portfast tell the switch to bring up the port, before it finishes the spanning-tree process.
If a switch connection comes up before the spanning-tree process, there could be a loop in your network. Spanning-tree allows you to have physical loops (one active and the rest disabled). If you bring the connection up, before spanning-tree knows about it you'll have a loop. When a loop happens, packets will ride the network mary-go-round.
It's good network design to have a physical network loop, but spanning-tree keeps the network loop free. Hope this makes sense.
- Thread starter
- #3
- Status
Similar threads
- Locked
- Question
