cisco show port status up down

/Rotate 0 /Count 24 For the Cisco IOS system messages format, you can refer to theMessages and Recovery Procedures Guidefor the release of software you run. Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in theshow interfacecounters for the VLAN interface. Total MAC Addresses : 0. /Type /Page 15 0 obj 27 0 obj Your network can send too many packets through this port for the port to handle at its current speed/duplex setup. In some cases, these delays can be up to 50 seconds. Check the port status on both sides. /Border [0 0 0] >> Description:show interfaces counters errors. uuid:762af52f-ff85-490f-a0c3-36712e66e664 After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. Note: There is, an Out-Discard counter in the Cisco IOSshow interfaces counters errorscommand which is explained inTable 1. Loops can also be caused by a uni-directional link. endobj If you turn the trunking mode to on (as opposed to auto or desirable) for one port and the other port has the trunking mode set to off, they are not able to communicate. A link light does not guarantee that the cable is fully functional. /Type /Annot << The designated port transmits BPDUs, and the non-designated port receives BPDUs. For example, here you see a high amount of output drops on the interface GigabitEthernet 8/9 on a Catalyst 6500 Series Switch: In order to analyze the problem, collect the output of these commands: show platform hardware capacity rewrite-engine drop. << For Cisco IOS on 2900/3500XL, 2950/2955, 3550, 2970 and 3750 series switches, theshow controllers Ethernet-controllercommand displays discarded frames, deferred frames, alignment errors, collisions, and so on. Note: If the output of theshow interface switchportcommand displays the port as a trunk port even after you configure the port as an access port with theswitchport access vlancommand, issue theswitchport mode accesscommand in order to make the port an access port. >> Common Causes: This error can indicate a duplex mismatch among other things. 3 0 obj What can cause "FastEthernet is up, line protocol is down" on a Cisco I don't think this command actually woks. Note If you are using Kerberos to authenticate to the switch, you will not be able to use the secure shell encryption feature. To display summary information on all of the ports on the switch, enter the show port command with no arguments. When a device is connected to a switchport .. %LINK-3-UPDOWN messages in the log show when the port status. 5. Check the results of the POST results from the switch to see if there were any failures indicated for any part of the switch. Common Causes:Collisions are normal for interfaces configured as half-duplex but must not be seen on full duplex interfaces. Description:show interfacescounter. These are brief descriptions of when the No dest, (unicast, multicast, and broadcast) counters can increment: If a port is an access port, and the port is connected to an Inter-Switch Link Protocol (ISL) trunk port, the No dest counter is very large since all inbound ISL packets are not forwarded. If the FCS, CRC, alignment, or runt counters increment, check for a duplex mismatch. /CreationDate (D:19990615140519Z) Make sure each switch can see the end device MAC address in its Content-Addressable Memory (CAM) table. The show interfaces status cli command shows you all interfaces. 5 0 obj Share Improve this answer answered Apr 7, 2015 at 0:27 Ron Trunk 65.6k 5 62 125 Add a comment Your Answer Post Your Answer How to detect port changes in real time on Cisco 4506 The controller senses the wire and checks if it is not busy before it transmits.Common Causes:This is normal on an half-duplex Ethernet segment. /Type /Annot No, it always shows this same date and time for all the interfaces (1993) even though the switch is configure with the correct date and time. On a Layer 2 switch we can check the status and various other counters and metrics for each physical ethernet interface or for every interface on the device. 2011-03-17T11:53:32Z To ping a host in a different IP subnetwork, you must define a static route to the network or configure a router to route between those subnets. /Threads [7 0 R] Check the trunking mode on each side of the link. Resolution In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. New here? >> ehxg!UD|_\\zAo*(EJu4Qa-NC-L%;1::Hr3j`39Xg35t!9 After 16 attempts have been made to send the packet the packet is dropped, and the counter increments. Description:sh interfacescounter. 1999-06-15T14:05:19Z /Last 44 0 R This is because the output queue on that interface is overwhelmed by the excess traffic due to the speed mismatch between the inbound and outbound bandwidths. Helpful with the search for software/hardware incompatibilities (with theRelease NotesorSoftware Advisor) and bugs (with theSoftware Bug Toolkit). /V 27 0 R This is because the output buffer of the interface is overwhelmed by the excess traffic due to the speed mismatch between the inbound and outbound bandwidths. This is helpful to diagnose a hardware problem on a module or port. connect.fm For each port on the switch, the command provides a real-time display of the rate at which data is received (Rx) and transmitted (Tx) in terms of kilobits per second (KBits/s), number of packets per second (Pkts/s), and utilization (Util) expressed as a percentage of the total bandwidth available. >> In many cases, this is the result of a bad NIC. The traceroute facility determines the address of the first hop by examining the source address field of the ICMP time-exceeded message. Undersize = frame < 64bytes. At times the traffic transmission characteristics of the applications used can lead to output buffer problems. The MFD is a function of the core diameter, the wavelength of the laser, and the refractive index difference between the core and the cladding. Find answers to your questions by entering keywords or phrases in the Search bar above. Make sure your L3 addressing on the end device and on the router/ L3 switch is correctly configured. The WS-X4448-GB-RJ45, WS-X4548-GB-RJ45, and WS-X4548-GB-RJ45V switching modules have 48 oversubscribed ports in six groups of eight ports each: The eight ports within each group use common circuitry that effectively multiplexes the group into a single, non-block, full-duplex Gigabit Ethernet connection to the internal switch fabric. << For fiber, make sure you have the correct cable for the distances involved and the type of fiber ports that are used. Description:show interfacescounter. 0 Helpful Share Reply johnlloyd_13 Engager Options 09-27-2014 02:01 AM Hi, You can show all the interfaces in a Cisco switch with the same command you are using. If a static address has been set up on another port in the same VLAN, and no static address was set up for the receiving port, the packet is dropped. Description:show interfaces counters errors. /F 27 0 R endobj It would be counted on theshow interfaceoutput for the appropriate physical interface. 12 0 obj The ports need to be in agreement as to what format they use on the link, or they do not understand each other. This document describes how to determine why a port or interface experiences problems. Cisco switch Link status Up, Protocol down - Super User /Dest (G1019856) Port status : Secure down help TechExams Community A dribble bit error indicates that a frame is slightly too long.Common Causes:This frame error counter is incremented for informational purposes, since the switch accepts the frame. This example shows how to ping a remote host from normal executive mode: This example shows how to ping a remote host using the -s option: This example shows how to enter a ping command in privileged mode specifying the number of packets, the packet size, and the timeout period: The Layer 2 Traceroute utility allows you to identify the physical path that a packet takes from a source to a destination. For troubleshoot information, see theDeferred Frames (Out-Lost or Out-Discard)section of this document. /Type /Annot To identify the next hop, traceroute sends a UDP packet with a TTL value of 2. The show interfaces card-type {slot/port}command is the used command for Cisco IOS on the Supervisor to display error counters and statistics. Make sure that both ends of the cable are plugged into the correct ports. >> Cisco Nexus 5000 Series Command Reference If Rx-No-Pkt-Buff increments and TxPauseFrames also increments, it means that the remote end disregards the pause frames (does not support flow control) and continues to send traffic despite the pause frames. Last clearing of"show interface" counters - The last time the clear counters command was issued since the last time the switch was rebooted. Check Connected Modules Checking Interface Status Displaying PORT SET ENABLED LED Status Displaying MAC Addresses Using Telnet Checking Cable Status Using Time Domain Reflectometer Changing the Logout Timer Monitoring User Sessions Using Ping Using IP Traceroute Using Layer 2 Traceroute Configuring ICMP They can be defined as any frame bigger than the standard ethernet frame of 1518 bytes (which includes the L2 header and Cyclic Redundancy Check (CRC)). This shows the number of hours, minutes, and seconds since the last packet was successfully received by an interface and processed locally on the router. Description:show interfacescounter. By default, Catalyst switch ports and interfaces are set to autonegotiate. If you see behavior that can only be considered strange, you can isolate the behavior to a specific box, and you have looked at everything suggested so far, this can indicate software or hardware problems. The show interface command displays the administrative and operational status of a switchport, input and output packets, buffer failures, errors, and so on. /Rect [162 439.9200134277 349.799987793 451.1400146484] But in full duplex environments the issue occurs when the excessive load is destined for the switch. /Dest (G1024221) /V 58 0 R If you use theshow interfacescommand without thestatusoption, you see a setup for speed and duplex, but you do not know whether this speed and duplex was achieved through auto-negotiation or not. /Border [0 0 0] Baby Giant frames are just slightly larger than the maximum size of an ethernet frame. 7 0 obj Trunk links between a switch and a router can make the switchport go down. This is an invalid configuration. Frames that increment at the upper end of this counter can exceedthe 15 collisions and can becounted as Excessive collisions. The size of this buffer is only 16 KB. I believe the 1993 timestamp is from when the switch first booted, before it set its clock. Collisions must not be seen on interfaces configured as full duplex. It is usually easier to upgrade the software than it is to upgrade hardware. If collisions increase dramatically, this points to a highly utilized link or possibly a duplex mismatch with the attached device. The number of times multiple collisions occurred before the interface transmitted a frame to the media successfully. /Count 14 Also, use a sniffer program to analyze packets that come in and out of the router fast Ethernet interface. 6 0 obj To change the logout timer value, perform this task in privileged mode: Change the logout timer value (a timeout value of 0 prevents idle sessions from being disconnected automatically). 06-22-2009 If the Rx is able to clear the Rx queue or reach low water mark within this interval, Tx sends out a special pause frame that mentions the interval as zero (0x0). If Rx-No-Pkt-Buff is zero or does not increment and the TxPauseFrames counter increments, it indicates that our switch generates pause frames and the remote end obeys, hence Rx FIFO queue depletes. Find answers to your questions by entering keywords or phrases in the Search bar above. Table 1. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and 3750 series. Without attenuators, the minimum link distance is 24.9 miles (40 km).

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