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?
With STP enabled, the SVI should come up as soon as the first physical port in that VLAN (access or trunk) moves into the forwarding state. With STP disabled, at least one port in that VLAN just has to be up/up.
You could exclude certain ports from beeing checked with the "switchport autostate exclude" command but I don't think you did something like that.
Have you already checked the STP state of "port A"?
Could you perhaps share the output of
- show interface <port-A> status
- show interface <port-A> switchport
- show vlan id <vlan-id-of-port-A>
- show spanning-tree vlan <vlan-id-of-port-A>
- show ip int brief vlan <vlan-id-of-port-A> (you can remove the IP if it's public)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...