Ive got a question re STP, ive attached a diagram of the current setup and along with a text file which shows the STP output for VLAN 40 from SW3 and SW4
My questions are:
1) for all vlans in the netwrk SW1 is the root, however only for VLAN 40 SW3 is set to be the root. WHy? and how can i change this so only SW1 is root for all
2) looking at the diagram, there are many links from SW1 to SW2 and one trunk(which allows all vlans on it) so if i were to shutdown interfaces G0/8, G0/12, G0/20,on SW2 would this make it more effecient and prevent loops?
3) looking at the output in the text file and the diagram, is there a chance of a loop here? if say host 3 or 4 were to send data to host 1 or 2. as both the trunk ports for switch 4 are set to FWD. Shouldnt one be in BLK mode?
The reason this question has arose is recently im noticing alot of events (flagged up by Whats Up Pro) saying that the device/port is down, then within a min its back up again, this is not only for servers but switches as wel. The funny thing is that although the status is down (as per Whats up) you can still telnet into the device/port in question.
Thanks for your help.