A device appears red on the topology map when Campus Manager cannot communicate with it via SNMP. This could be due to a variety of causes. The device may be down (but you say it's online), the SNMP credentials may have changed on the device, or the device may be busy, and not responding to SNMP queries quickly enough.
A quick way to troubleshoot this is to start a packet capture filtering on UDP port 161 traffic to this switch, then perform a Campus Data Collection for the switch. The packet capture should then give you an idea as to why the switch is unreachable. That said, a new Data Collection may succeed, so the switch may turn back to green.
Note: Campus Manager is not a fault management application, so do not assume that green devices are available and red devices are necessarily down.
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...