endobj This does not tell you whether autoneg was used to achieve this. endobj /Type /Catalog If unicast flooding is enabled on that port, it can cause the port to shut down after a reboot. This example shows you how to display the MAC address of a specific port: This example shows you how to display the MAC addresses of all ports on a module: You can display the capabilities of any port in a switch using the show port capabilities command. If stations are not able to talk to their primary servers when they connectthrough the switch, the problem can involve delays on the switch port when it tries to becomeactive after the physical layer link comes up. ^ %-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 This means it is currently not connected to anything, but it can connect if it has a good connection to another operational device. Most Cisco switches have a port in the notconnect state. If any devices in the path are transparent to CDP, l2trace will not be able to trace the Layer 2 path through those devices. Gigabit Ethernet has an auto-negotiation procedure that is more extensive than the one used for 10/100 Ethernet (Gigabit auto-negotiation spec: IEEE Std 802.3z-1998). /Type /Annot /Type /Annot If the frames received on any group exceeds the bandwidth of 1 Gbps, the device starts to drop the frames. This example shows the source and destination MAC addresses specified, with no VLAN specified but with the detail option specified. 01:03 AM These messages generally tell you what the mismatch is and where it occurs. /Count 24 The documentation set for this product strives to use bias-free language. Changes aresavedto the config in Cisco IOS with the write memory command. 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. Monitorthese counters for increments as it is useful to determine whether traffic flows properly through the interface. Set the duplex to full-duplex. The total number of frames which are filtered because of the type of VLAN information contained in the frame. No destination multicast are the number of multicast packets that the port did not forward to any other ports. /keywords () 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)). 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. Look for broken or lost pins on connectors. This chapter consists of these major sections: Using Secure Shell Encryption for Telnet Sessions. The line protocol up message shows the data link layer status of the interface and says that the interface can send and receive keepalives. Note: For 2900/3500XL Series switches use theshow interfacescard-type {slot/port}command with theshow controllers Ethernet-controllercommand. /First 43 0 R /Type /Pages Verify distance and cable used per GBIC as defined in this table. The error message is received when the traffic level reaches about 2.5 Mb. Frames received that exceed the maximum IEEE 802.3 frame size (1518 bytes for non-jumbo Ethernet) and have a bad Frame Check Sequence (FCS). Switch#show inter status. You can search known software bugs with the Software Bug Toolkit. 25 0 obj This means that the port is up as far as Layer 1 (L1) is concerned. Also you can use (it is disruptive for the port): test cable-diagnostics tdr interface xx/yy and then Small amounts of symbol errors can be ignored. 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). Total output drops - The number of packets dropped because the output queue is full. This will give you the last upinformation. 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. 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. You can use IP ping to test connectivity to remote hosts. endobj Description:show interfaces. /Parent 3 0 R The loop guard feature makes additional checks. endobj << /N 28 0 R The pause packets stop when the connected device is able to receive the traffic. i feel this command is only for trunks using DTP and not for access ports. Port status as seen in the color assist mode. The use of this feature can help you identify difficult to find unidirectional link problems. Refer toConfiguring and Troubleshooting Ethernet 10/100/1000 MB Half/Full Duplex Auto-Negotiationfor details on how to resolve speed/duplex and auto-negotiation issues. endobj 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. The port LED is set to the orange color and, when you issue the show interfaces command, the port status shows as Errdisabled. Generally, a one percent ratio of errors to total traffic is acceptable for half-duplex connections. This high load of traffic oversubscribes the ports, which exhausts the input buffers and causes the Rx-No-Pkt-Buff counter and input errors to increase rapidly. /Border [0 0 0] Without the loop guard feature, the port assumes the designated port role. Description:The number of times that the transmitter has been that run faster than the switch can handle.Common Causes:This can occur in a high throughput situation where an interface is hit with a high volume of traffic bursts from many other interfaces all at once. >> It is usually easier to upgrade the software than it is to upgrade hardware. For general configuration information and additional information on how to troubleshoot, refer to Configuring and Troubleshooting Ethernet 10/100/1000 MB Half/Full Duplex Auto-Negotiation . Cisco Show Interface Command on Routers and Switches Explained 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. 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. - edited Cisco IOS Software Release 12.2(25)SG supports the simultaneous use of 10-Gigabit Ethernet and the Gigabit Ethernet SFP interfaces on Catalyst 4500 switches. This can be an indication of faulty hardware, dot1q or ISL trunking configuration issues. You can move the device that hangs off this port to faster media. An excessive collision happens when a packet has a collision 16 times in a row. There are no specific requirements for this document. The reason for this occurrence is because the time to propagate the signal from one end of the network to another is longer than the time to put the entire packet on the network. Make sure the port or module has not been disabled or powered down for some reason. Once you know the switch actually has the MAC address of the device in the CAM table, determine whether this device is on the same or different VLAN from where you try to ping. Learn more about how Cisco is using Inclusive Language. Connections for transmit-to-transmit and receive-to-receive do not work. Loops can also be caused by a uni-directional link. endobj Refer to these documents for more information on the different trunking modes, guidelines, and restrictions: System Requirements to Implement Trunking. In many cases, this is the result of a bad NIC. The number of times multiple collisions occurred before the interface transmitted a frame to the media successfully. The | include connected shows only the lines of the output that contain the word "connected". endobj This can lead to slow throughput of packets across the device. switch# show vtp status VTP Version : 1 Configuration Revision : 0 . 5 minute input/output rate - The average input and output rate seen by the interface in the last five minutes. 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. Common Causes:In many cases, this is the result of a bad NIC. 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. Note:The Catalyst 6500/6000 series switches do not clear the bit counters of an interface with theclear counterscommand. /N 59 0 R /B [27 0 R 28 0 R] No destination unicast are the number of unicast packets that the port did not forward to any other ports. This chapter describes how to check switch port status and connectivity on the Catalyst 4500 series switch. This table shows the most common commands used to troubleshoot the port or interface problems on switches that run Cisco IOS System Software on the Supervisor. << Make sure that both ends of the cable are plugged into the correct ports. /Subtype /Link Find answers to your questions by entering keywords or phrases in the Search bar above. 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). The SSH feature provides security for Telnet sessions to the switch. /Dest (G1040467) >> Fa0/1 connected 1 a-full a-100 10/100BaseTX . /EmbeddedFiles 11 0 R I have a port that I believe is going up and down on a 2960X-port switch. This document covers reasons that STP can fail, what information to look for to identify the source of the problem, and what kind of design minimizes STP risks. The example shows the log messages that result from a duplex mismatch between two Catalyst 6000 series switches: one that runs CatOS, and the other that runs Cisco IOS. If a port has a solid orange light, this means the software inside the switch shut down the port, either by way of the user interface or by internal processes. The results of a duplex mismatch are extremely slow performance, intermittent connectivity, and loss of connection. /PageLabels 8 0 R Run a port TDR to test the integrity of the copper cable. The frames received that are smaller than the minimum IEEE 802.3 frame size of 64 bytes (which excludes frame bits but includes FCS octets) that are otherwise well formed.Common Causes:Check the device that sends out these frames. /Type /Annot Resolution In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. To support authentication for Telnet with secure shell encryption, use the telnet keyword in the set authentication commands. For information in regard to the recovery from corrupted images, choose your platform Switch and look at the Troubleshootsection. For a 10 Mbit/s port this is later than 512 bit-times into the transmission of a packet. The causes for this range from EtherChannel misconfiguration that causes a PAgP flap, duplex mismatch, BPDU port-guard and portfast configured at the same time, UDLD that detects a one-way link, and so on. 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. >> This indicates that a corruption of the packet occurred within transfer, and Blackwater received the corrupted packet. In this situation, your bandwidth is used by the same frames over and over again, which leaves little room for legitimate traffic. /Type /Annot /Subtype /Link PDF Checking Port Status and Connectivity - Cisco /Type /Annot Release Notes for the Cisco Catalyst IR1101 Rugged Series Router 03-01-2019 The 9-micron and 10-micron values refer to the mode-field diameter (MFD), which is the diameter of the portion of the fiber that is light-carrying. >> In order to resolve this issue, create trunk ports instead of sub interfaces. Port on switch down/down (notconnect) - Cisco - The Spiceworks Community Theshow interfaces counters errorscommand is used in Cisco IOS to display the output of the interface errors only.

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