cisco show port status up down

/Rotate 0 endobj Switch#show port-security interface fastEthernet 0/1 Port Security : Disabled. In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. The messages are generated by the switch. This document describes how to determine why a port or interface experiences problems. It would be counted on theshow interfaceoutput for the appropriate physical interface. When a layer 3 interface is connected to a layer 2 switchport, it is not able to interpret these frames, which results in Input errors, WrongEncap errors, and Input queue drops. These drops are not obvious as they are dropped at the internal ASIC rather than the actual interfaces. Alignment errors are a count of the number of frames received that do not end with an even number of octets and have a bad Cyclic Redundancy Check (CRC).Common Causes:These are usually the result of a duplex mismatch or a physical problem (such as cabling, a bad port, or a bad NIC). /Dests 10 0 R If the VLANs are frequently in fast aging, check the reason for fast aging. Upgrade the NIC card driver to the latest version available on the web site of the manufacture to resolve this. Hardcode both ends of the link to full duplex so that the negotiation mismatch can be avoided. Release Notes for the Cisco Catalyst IR1101 Rugged Series Router Typically, the output drops can occur if QoS is configured and does not provideenough bandwidth to certain class of packets. endobj When a host receives a datagram with an unrecognized port number, it sends an ICMP port unreachable error to the source. /Dest (G1019856) Use theshow versioncommand to verify the current software version along with thedir flash: ordir bootflash: (dependent upon the platform) command to verify the available flash memory for the upgrade: For information on how to upgradesoftware for your Cisco Switches, navigate to link, choose your platform and look at the Software Configuration section. >> Each time we previously disconnected and reconnected the cable the port status just remained down/down. Gigabit Ethernet (1000 Base-X) uses 8B/10B Encoding to translate 8bit data from the MAC sublayer(layer 2) to a 10bit Symbol to send over the wire. Total output drops - The number of packets dropped because the output queue is full. This can be an indication of faulty hardware, dot1q or ISL trunking configuration issues. endobj These frames are dropped and not propagated onto other ports. Basically, up/down means the port is available for a cable/connection, but doesn't have one. The ports need to be in agreement as to what format they use on the link, or they do not understand each other. The port is functioning well just odd to see these log. To stop a ping in progress, press Ctrl-C. To ping another device on the network from the switch, perform one of these tasks in normal or privileged mode: ping -s host [packet_size] [packet_count]. If a router finds a TTL value of 1 or 0, it drops the datagram and sends back an Internet Control Message Protocol (ICMP) time-exceeded message to the sender. CDP is Cisco proprietary and works when you send packets to a well-known MAC address 01-00-0C-CC-CC-CC. Collisions in a half-duplex environment are normal expected behavior. You can show all the interfaces in a Cisco switch with the same command you are using. In order to see POST results per module, use theshow diagnostics modulecommand. If a port or module is manually shut down on one side of the link or the other, the link does not come up until you re-enable the port. /Type /Annot How to detect port changes in real time on Cisco 4506 This message indicates to the traceroute facility that it has reached the destination. /Border [0 0 0] /Subtype /Link You could try and set the keepalive timer on your switchports to something higher than the highest interval seen in your logs, say 20 minutes. 13 0 obj /MediaBox [0 0 612 792] The interface displays a lot of information including a visual representation of each port's status. Therefore, it applies to only process switched traffic. This section lists the guidelines for the Layer 2 Traceroute utility: The Layer 2 Traceroute utility works for unicast traffic only. i feel this command is only for trunks using DTP and not for access ports. This example shows how to check module status on a Catalyst2948G switch: This example shows how to check module status on a specific module: You can display summary or detailed information on the switch ports using the show port command. If you have checked or tried the other suggestions in this document (checked speed/duplex, no physical errors on the link, all the traffic is normal valid traffic, and so on), then reducethe unit size that is sent by the application which can help to alleviate this problem. 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. When the Gigabit Ethernet switching module is not fully utilized, you can balancee the port connections across port groupings to maximize available bandwidth. Fa0/1 connected 1 a-full a-100 10/100BaseTX . This is an invalid configuration. For further information on how to troubleshoot hardware problems on Catalyst switches that run Cisco IOS, navigate to the Cisco Switchessupport pages, choose your platform and look at the Troubleshooting > Hardwaresection. >> The resolution is that ordinarily the system recovers automatically. You can use IP traceroute to identify the path that packets take through the network on a hop-by-hop basis. Share Improve this question Follow asked Aug 23, 2015 at 6:13 ae41 The total number of frames which experience exactly one collision and are then successfully transmitted. Table 1. 17 0 obj Jumbo frames are not defined as part of the IEEE Ethernet standard and are vendor-dependent. << On one of my 3750's ports that have never gone down show a 1993 timestamp, ports that have gone up/down have a recent (correct) date, 1 link ups, last link up on Sun Feb 28 1993, 16:01:20, 4 link ups, last link up on Tue Dec 02 2014, 14:51:11.

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