Chapter 4: Monitoring
•Spanning Tree - the port’s Spanning Tree state, which could be any one of the following states:
•Blocking - The port isn’t currently the designated port to a LAN and is not forwarding any packets. (This means another port is providing the route to that LAN and since the Spanning Tree protocol doesn’t allow simultaneous redundant paths, the port is blocked. If the other port’s route to that LAN goes down, this port would then start forwarding packets.)
•Listening - The port is listening for other bridges on the network to determine if it should go to the forwarding or blocking state.
•Learning - The port is listening for other bridges on the network and making a table of addresses from packets that it has received. Once the port goes to the forwarding state, it can then use the address information it has learned.
•Forwarding - The port is the designated port for the LAN and is forwarding packets and sending out bridge protocol packets.
•Broken - The port is not forwarding packets. Reasons for a broken status might include no cable connected, no link status, the ring is not operational, or an NMS has disabled the port.
•Disabled - The port isn’t configured for Spanning Tree.
•Pkts Transmitted - number of packets transmitted from the port. This includes any packets that might have experienced transmission errors. (The port’s statistics are reset whenever the port is started.)
•Pkts Received - number of good packets received through the port. Packets with reception errors are not included, nor are packets local to that segment that are hardware filtered.
•Small Buffers - number of buffers currently assigned to the port (see RX_Q Overflows below).
•RX_Q Overflows - number of incoming packets the port had to drop because of a lack of buffers. After a reboot, the ATX tries to automatically
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