I have a Cisco 6513 switch that performs inter-vlan routing.
I have a series of Cisco 3750 switches and a 3560 switch connected to the 6513 via trunk links. (4 3750 switches and 1 3560)
I am having trouble with ping/telnet from a desktop PC located behind one of the 3750s. I cannot ping or telnet to any of the 3750s or the 3560.
The only switch I can ping or telnet into is the 1st 3750 switch that's directly connected to the 6500 switch.
About the only way I can get it to work is if I telnet into the 1st 3750 and then telnet into another switch from there. At that point, if I initiate a ping out from one of the "trouble" switches, then I can ping/telnet into the switch from anywhere. This will last for a little while, then stop working again.
I changed the ARP timeout value on the 6500 switch to be 14400. That seemed to help for a little while but now it's not working again.
I think there's a problem with the 6500 switch learning the ARP from the downstream switches because if I do a "show mac-address-table" and look for the mac address of the 3750 switches, I can't find them in there.