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Help with Cisco 4000 series switch

R

reicherb

Platinum Member
I installed a new 10/100/1000 blade in my 4006 switch, set a VLAN on all of the ports, enabled portfast on all ports and connected PCs to the 10/100 ports. The PCs were not able to get an address from the DHCP server unless they were rebooted multiple times. I thought enabling portfast was supposed to solve that. I then added port channel mode off to all ports and now all PCs can connect. I'm not sure if that command did anything or if it's just because the PCs have been rebooted. Any ideas what is causing this problem?

Thanks.
 
three things you must do for host ports on catOS switches (4000, 5000, 6000)

set spantree <mod/port> enable
set trunk <mod/port> off
set port channel <mod/port> off.

spantree adds 30 seconds to the port startup time, auto trunking adds about 5 and auto channeling adds about 19 seconds. Add all those together and you have a PC that will send out packets before the port is acutally open and forwarding them.
 
Yup, I added the other 2 and am now in business. I understand (or atleast somewhat) what spanning tree does, but what do trunking and ther port channel do?

Thanks.
 
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