I'm currently troubleshooting a problem occurred 3 days ago by a customer.
He has 4 switches (sg500) 2 and 2 stacked. They're connected with glas using 2 interfaces (PO) in LACP. Everything went fine until friday evening when the second pair of switches were reachable only on VLAN 1.
Long story short: those switches are exactly the same (model, firmware, config) they have 3 vlans (1, 200, 201) and ON THAT switch vlans were running correctly bud sadly on the uplink PO both 200 and 201 vlans were configured as "untagged" and of course they coudn't work. Logins are logged and I can find anything on the NVRAM nor Flash log. There's no reboot, no config change, no logins. Just suddenly the switch decided to remove the tag only on the uplink port.
Introduction:Topology Diagram:Configuration Overview:Related
Information: Introduction: This document describes how to connect SG300
with Catalyst switch via STP. Spanning Tree Protocol (STP) is a Layer 2
protocol that runs on mainly on switches. The spec...
The Sx500 Series Stackable Switches offers different port features. You
can add security to a port, make the port more energy efficient, map a
VLAN to a port, make a port available or not to a specific network
portion, and so forth. The next set of articl...
Recently, HP Networking published a blog post attempting to counter the
favorable third party Miercom report on our Cisco® 200 and 300 Series
Smart and Managed switches: