Hello Please help me
Scenario: I got a new Cisco 4510, setup vlans and vlan interfaces, all un-shuted, and connected few things, the problem is on, say port A, connecting on a carrier device.
Problem: no matter which vlans I setup on the switch port A, only port A in that vlan, switch port A is up, but vlan interface is down. setup vlans on other connected ports, only one port in that vlan, vlan interfaces came up straight away.
Things I have tried but cannot fix the issue:
1, changed the cable connecting to that carrier device.
2, moved the cable to another switch port.
3, tried different vlans and vlan interface, created new, but they all didn't work on whatever the port connecting to the carrier, and they all worked on other ports.
My question, in what situation can a switch port is up connected, but the binded vlan interface is still down?
what can I do now?
thanks a lot.