If you connect a good cable to two switch ports in the notconnect state, the link light must become green for both ports, and the port status must indicate connected. Collisions in a half-duplex environment are normal expected behavior. The next two sections describe how to use IP traceroute. /Kids [14 0 R 15 0 R] /Dest (G1019856) Description: show interfaces and show interfaces counters errors.The number of times a collision is detected on a particular interface late in the transmission process. i see. Try to find the offending device and remove it from the network. FCS error count is the number of frames that were received with a bad checksum (CRC value) in the Ethernet frame. Port Status : Secure-down. 7 0 obj If you have a large amount of alignment errors, FCS errors, or late collisions, this can indicate one of these: A common issue with speed/duplex is when the duplex setup are mismatched between two switches, between a switch and a router or between the switch and a workstation or server. Description:show interfacescounter. Issue theshow cam agingcommand to check the CAM aging time on the switch. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and and 3750 series. 04:30 PM For more details on the different types of cables/connectors, cable requirements, optical requirements (distance, type, patch cables, and so on. endobj This example shows how to disconnect an active console port session and an active Telnet session: The next two sections describe how to use IP ping. Generally, a one percent ratio of errors to total traffic is acceptable for half-duplex connections. 05-11-2020 When the receive part (Rx) of the port has its Rx FIFO queue filled and reaches the high water mark, the transmit part (Tx) of the port starts to generate pause frames with an interval value mentioned in it. These are the total number of packets received that were less than 64 octets long (which excludes frame bits but includes FCS) and have a good FCS value. NIC Card on your devices. >> by recently I have noticed my switches are showing log when I connect a new device to it. This is because the switch does not know that the connected device is a PC; the switch only knows that the port has changed the state. This will give you the last upinformation. This ensures that the MAC address table (the CAM table) contains the most recent entries. /Names 2 0 R Same behaviour when a PC wakes up from sleep. Navigate to thelink for more information about the commands Recover Errdisable Port State on Cisco IOS Platforms: One common cause of inactive ports on switches that run Cisco IOS is when the VLAN they belong to disappears. Use theshow run interfacecommand and check to see if the interface is in ashutdownstate: If the port goes into shutdown mode immediately after a reboot of the switch, the probable cause is the port security setup.
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