The port is functioning well just odd to see these log. endobj /Dest (G1020140) If you have a large number of deferred frames, or Out-Discard (also referred to as Out-Lost on some platforms), it means that the switch output buffers have filled up and the switch had to drop these packets. If the port is a secure port, packets with disallowed source MAC addresses are not forwarded and increment the counter. For example, if a large amount of traffic bursts comes in on a gigabit interface and is switched out to a 100Mbps interface, this can cause Xmit-Err to increment on the 100Mbps interface. Without attenuators, the minimum link distance is 24.9 miles (40 km). - edited For the duplex mismatch scenario, the late collision is seen on the half-duplex side. /Rect [162 388.9200134277 312.299987793 400.1400146484] Eliminate faulty media convertors: fiber-to-copper, and so on. TCNs and fast aging are fairly rare. See "Working with System Software Images," for the software image naming conventions that are used for the encryption images. It also occurs when the hardware hits an oversubscription. Check or swap the copper or fiber cable. << /Dest (G1019941) The idea is that when a topology change occurs, this value is necessary to flush the CAM table faster, to compensate for the topology change. The traceroute facility determines the address of the first hop by examining the source address field of the ICMP time-exceeded message. << 10 0 obj For example, you can look attheMessages and Recovery Proceduresfor Cisco IOS Releases. Before you can open a Telnet session to the switch, you must first set the IP address (and in some cases the default gateway) for the switch. /Type /Annot Description:The number of outbound packets chosen to be discarded even though no errors have been detected.Common Causes:One possible reason to discard such a packet can be to free up buffer space. Note: Variables that can affect routing (for example, load and reliability) are not cleared when the counters are cleared. The IEEE ethernet specification forbids this bit to be set in any Ethernet frame. To use this feature, you must install the application on the client accessing the switch and you must configure SSH the switch. Check the end device with a pingsent from the directly connected switch first, then work your way back port by port, interface by interface, trunk by trunk until you find the source of the connectivity issue. Theshow modulecommand can indicate faulty, which can indicate a hardware problem. If this link is run in 1G (1000BASE-TX) mode, Gigabit sync, which occurs every 10msec, must be able to detect the link down faster. OnCatalyst 4000 Seriesrcv-err = the sum of all receive errors, which means, in contrast to the Catalyst 5000, that the rcv-err counter increments when the interface receives an error like a runt, giant or FCS-Err. 04:20 PM. Encryption commands are set crypto key rsa, clear crypto key rsa, and show crypto key. endobj /Dest (G1024221) Note: The right hand column on the next table gives a brief description of what the command does and lists any exceptions to the use per platform. A switch is in down state when there is nothing connected to the port or if its admin shutdown. Look at the "sh interface <BLAH>" and "sh controll e <BLAH>" any any line errors. That's how they behave. Refer to Mode-Conditioning Patch Cord Installation Note for more information. Use theshow interfaces fastEthernet 6/1 statuscommand to display this: Last input, output - The number of hours, minutes, and seconds since the last packet was successfully received or transmitted by the interface. An obvious but sometimes overlooked cause of port connectivity failure is an incorrect configuration on the switch. /Count 14 Port Overview The Switch Ports section shows a basic view of the status of all switch ports. This enables the remote device to start to transmit packets. SSH is supported for remote logins to the switch only. Note:The Catalyst 6500/6000 series switches do not clear the bit counters of an interface with theclear counterscommand. << This is not available on all IOS versions. Also refer to the sectionInput Errors on a Layer 3 Interface Connected to a Layer 2 Switchport. /Count 4 You can move the device that hangs off this port to faster media. 27 0 obj This usually happens because one of the ports of a physically redundant topology (not necessarily the STP block port) no longer receives STP BPDUs. Cisco Internetwork Operating System Software . Common Causes:In many cases, this is the result of a bad NIC. Number of packets received by the port from the network, where the packets were more than 1514 bytes. The number of times the carrier was lost in transmission. Refer toUnderstand and Configure the Unidirectional Link Detection Protocol (UDLD) Featurefor configuration information on UDLD. /Subtype /Link You can also use thespanning-tree portfastcommand per interface, but this requires that you turn off trunking and etherchannel separately to help fix workstation startup delays. sh ip protocols - all of the dynamic routing Description:show interfacescounter. Common Causes: This error can indicate a duplex mismatch among other things. Congestion can lead to packet loss. Change the cable and patch panel cord to ensure that the cable and patch cords are not defective. It is counted with short traffic bursts flow when some packets fill this buffer. In some cases, these delays can be up to 50 seconds. Also, if there is a hub connected to the port, collisions between other devices on the hub can cause these errors.Platform Exceptions:Alignment errors are not counted on the Catalyst 4000 Series Supervisor I (WS-X4012) or Supervisor II (WS-X4013). 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. If the amount of data received for a port begins to exceed buffer capacity, flow control sends pause frames to the remote port to temporarily stop traffic and prevent frame loss. ^ %-V5V'}ho0&qctqW
o1?W[|Z43lHLK
{[#-bX?+$[ %Tba2'u4'JhB,0'A9C!8xcTy\ORoI_gb+AgunX
mwPoOfT30Q-oI+M9md%EQebo'07rMgFd51/`(cj -Bf4 }qwaSX K((EFv=rvR_9xD x6OpX2W&r?zu=T Also, dependent upon the hardware and software, some switch platforms increment port and interface error counters as a result. 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. 5 Checking Port Status and Connectivity 5Checking Port Status and Connectivity This chapter describes how to check switch port status and connectivity on the Catalyst 4500 series switch. The traffic load destined for this switch is excessive and causes the frames to be discarded. A high number of CRCs is usually the result of collisions but can also indicate a physical issue (such as cabling, bad interface or NIC) or a duplex mismatch. 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. Note: On the Catalyst 4503, 4506, and 4507R series switches, this capability is automatically enabled. /Rect [162 320.8800048828 286.5599975586 332.1600036621] Look at your logs (if link state logging is enabled) for signs of the interface going down/up. /Rect [162 439.9200134277 349.799987793 451.1400146484] Each time we previously disconnected and reconnected the cable the port status just remained down/down. The command show diagnostic was introduced in 12.1(11b)E for the Catalyst 6000 series and show diagnostics (with an s ) was introduced in for Catalyst 4000 Series. This is an indication that the internal send (Tx) buffer is full.Common Causes:A common cause of Xmit-Err can be traffic from a high bandwidth link that is switched to a lower bandwidth link, or traffic from multiple inbound links that are switched to a single outbound link. This document describes how to determine why a port or interface experiences problems. /Last 44 0 R 2900/3500XL only.The number of times that a port received a packet from the network, but the switch did not have the resources to receive it. Use theshow interfacecommand for Cisco IOS to look for errdisable, disable or shutdown status. Here, the VLAN aging time is already set to fast aging. Switch#show inter status. Look at your logs (if link state logging is enabled) for signs of the interface going down/up. The results of a duplex mismatch are extremely slow performance, intermittent connectivity, and loss of connection. The Catalyst enterprise LAN switches are multimodule systems. /Kids [42 0 R] I have a port that I believe is going up and down on a 2960X-port switch. /Border [0 0 0] Follow the below . /Type /Page show tech-support port-channel. If the switch port receives a lot of late collisions, this usually indicates a duplex mismatch problem and can place the port in an errdisable status in a result. To open a Telnet session to another device on the network from the switch, perform this task in privileged mode: This example shows how to open a Telnet session from the switch to the remote host labsparc: The login timer is the number of minutes after which an idle session is disconnected. /R [41 63 585 621] New here? Check the results ofshow modulefor Catalyst 6000 and 4000 series switches that run Cisco IOS. Description:show interfaces counters errors. /Kids [14 0 R 15 0 R] >> In SPA modules, after you create a sub interface with 802.1Q, the same VLAN is not usable on the switch. You can upgrade10Mbps links to 100Mbps or Gigabit Ethernet links when possible. For example, on a Catalyst2948G series switch, the 24Fast Ethernet ports belong logically to module 2. The bottom line is that even if you configure the interface to recover from errdisable the problem reoccurs until the root cause is determined. /Border [0 0 0] Unknown protocol drops are normally dropped because the interface where these packets are received is not configured for this type of protocol, or it can be any protocol that the router does not recognize. endobj Check the IP address, subnet mask, default gateway, dynamic routing protocol configuration, static routes, and so on. Enter both the module number and the port number to see detailed information about the specified port. >> The command you are using is the show interfaces command. After you issue the command, re-boot the switch or else the output of theshow interface status module
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