This means that the port is up as far as Layer 1 (L1) is concerned. 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. If the switch that deleted the VLAN is a VTP server for the VTP domain, every server and client switch in the domain has the VLAN removed from their VLAN table as well. 8 0 obj If the mismatch occurs between two Cisco devices with the Cisco Discovery Protocol (CDP) enabled, you see the CDP error messages on the console or in the logging buffer of both devices. 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. %PDF-1.4 /Type /Annot /Border [0 0 0] This utility determines the path by looking at the forwarding engine tables of the switches in the path. For this reason, they were discarded by the switch. CDP is useful to detect errors, as well as port and system statistics on nearby Cisco devices. endobj /Kids [42 0 R] To display the MAC address for a specific port, perform this task in privileged mode: Display the MAC address for a specific port. Wire Gigabit port one to Gigabit port two. /Rect [162 473.8800048828 315.8999938965 485.1600036621] Here, the VLAN aging time is already set to fast aging. Number of frames that took longer than two seconds to travel through the switch. Traceroute starts by sending a User Datagram Protocol (UDP) datagram to the destination host with the TTL field set to 1. Distances are based on fiber loss. If you do not include a specific interface, it will show all the interfaces. Port Name Status Vlan Duplex Speed Type . ". /Rotate 0 The Catalyst enterprise LAN switches are multimodule systems. The number of times a collision occurred before the interface transmitted a frame to the media successfully.Common Causes:Collisions are normal for interfaces configured as half-duplex but must not be seen on full duplex interfaces. Fast aging temporarily sets the CAM aging time to the number of seconds that the user specifies, and is used in conjunction with the Topology Change Notification (TCN) process. Check the trunking mode on each side of the link. An image can have become corrupted. Try the following commands. All switches in the path must be reachable from each other. If that VLAN is deleted, then the port or interface becomes inactive. It is common for devices like laptops or other devices to be set to autonegotiate as well, yet sometimes autonegotation issues occur. /N 59 0 R 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. The source and destination switches must belong to the same VLAN. The show interfaces status cli command shows you all interfaces. Port Status : Secure-down. 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. It would be counted on theshow interfaceoutput for the appropriate physical interface. When you use either the WS-X6548-GE-TX or WS-X6148-GE-TX modules, there is a possibility that individual port utilization can lead to connectivity problems or packet loss on the surrounding interfaces. Checking Port Status and Connectivity Download this chapter Checking Port Status and Connectivity Download the complete book Catalyst 4500 Series, Catalyst 2948G and Catalyst 2980G Switches Software Configuration Guide, 7.5 ( PDF - 6 MB) Feedback Table Of Contents Checking Port Status and Connectivity Checking Module Status Checking Port Status /iaPath () /Count 10 An alternative to this command (for Catalyst 6000, 4000, 3550, 2970 2950/2955, and 3750 series switches) is theshow interfacescard-type counters errorscommand which only displays the interface error counters. I am not sure if there is a command that show that, however if you have monitoring system it will show when and how many times has an interface gone up and down. Alignment errors are the number of frames received that do not end with an even number of octets and have a bad CRC. UDLD can put a port in errdisable state when it detects a unidirectional link. The result is the runt counter now increments inshow interfaces, along with the fragments counter inshow interfaces counters errorswhen a frame <64 bytes with a bad CRC is received.Cisco Catalyst 3750 Series SwitchesIn releases prior to Cisco IOS 12.1(19)EA1, when dot1q is used on the trunk interface on the Catalyst 3750, runts can be seen onshow interfacesoutput because valid dot1q encapsulated packets, which are 61 to 64 bytes and include the q-tag, are counted by the Catalyst 3750 as undersized frames, even though these packets are forwarded correctly. /Dest (G1030299) Description:show interfacescounter. The switch will reflect that behaviour and you'll see a link go down/up two times. If the link light for the port does not come on, you can consider these possibilities: Connect cable from switch to a known good device. When the cable is first connected to the port, some of these errors can occur. Description:show interfacescounter indicates that the transmit jabber timer expired. The reason for this error message is the receipt of a packet from the switch fabric, where the CRC value in the fabric header on that packet did not match the CRC value calculated by the Fabric Interface Controller (FIC) subblock of the Blackwater ASIC. Disable theKeepaliveson the interface of the router. . Change the cable and patch panel cord to ensure that the cable and patch cords are not defective. 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. Refer toCisco Technical Tips Conventionsfor more information on document conventions. You can move the device that hangs off this port to faster media. endobj To monitor inbound and outbound traffic on the port as displayed by the next output, for unicast, multicast, and broadcast traffic. For information about setting the IP address and default gateway, see "Configuring the Switch IP Address and Default Gateway.". Description:show interfaces counters errors. The number of received packets ignored by the interface because the interface hardware ran low on internal buffers. >> Port status as seen in the color assist mode. The number of valid size frames with Frame Check Sequence (FCS) errors but no frame errors. You can upgrade10Mbps links to 100Mbps or Gigabit Ethernet links when possible. Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in theshow interfacecounters for the VLAN interface. 14 0 obj 6. 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. /Threads [7 0 R] 2011-03-17T11:53:32Z Description:show interfacescounter. For possible issues related to Field Notices, refer toField Noticesfor LAN and ATM Switches. 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. Port Overview The Switch Ports section shows a basic view of the status of all switch ports. Description:show interfaces counters errors. The command you are using is the show interfaces command. (Protocol down/up). >> This error message is caused when a frame is transmitted, and the local buffer of the controller chip local buffer receives insufficient data. - edited This is helpful to diagnose a hardware problem on a module or port. I usually start first with the following command: Switch0# show interfaces status Port Name Status Vlan Duplex Speed Type Fa0/1 connected 1 auto auto 10/100BaseTX After you issue this command, configure the port for any layer 2 properties. Do not disable auto-negotiation between switches unless absolutely required to do so, as physical layer problems can go undetected, which results in STP loops. For example, if the port is 10 Mbps, move this device to a 100 Mbps or Gigabit port. << View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Check the Cable and Both Sides of the Connection, Ethernet and Fast Ethernet Maximum Transmission Distances, Troubleshoot the Most Common Port and Interface Commands for Cisco IOS, Understand the Specific Port and Interface Counter Output for Cisco IOS, Show Controller Ethernet-Controller for Cisco IOS, %INTR_MGR-DFC1-3-INTR: Queueing Engine (Blackwater) [1]: FIC Fabric-A Received Unexpected Control Code, Command Rejected: [Interface] not a Switching Port, Port or Interface Status is Disable or Shutdown, Uplink Port or Interface Status is Inactive, Deferred Counter on the Catalyst Switch Interface Increments, Intermittent Failure to set timer [value] from vlan [vlan no], Use of Switchport Host to Fix Startup Delays, Speed/Duplex, auto-negotiation, or NIC Issues, Deferred Frames (Out-Lost or Out-Discard), Input Errors on a Layer 3 Interface Connected to a Layer 2 Switchport, Rapidly Increment Rx-No-Pkt-Buff Counter and Input Errors, Connectivity Issues due to Oversubscription, Last Input Never from the Output of Show interface Command, Mode-Conditioning Patch Cord Installation Note, Configuring and Troubleshooting Ethernet 10/100/1000 MB Half/Full Duplex Auto-Negotiation, Most Common Port and Interface Troubleshooting Commands for Cisco IOS, Recover Errdisable Port State on Cisco IOS Platforms, Understanding and Configuring VLAN Trunk Protocol (VTP), Configuring Jumbo/Giant Frame Support on Catalyst Switches, Using Portfast and Other Commands to Fix Workstation Startup Connectivity Delays, Troubleshooting Cisco Catalyst Switches to NIC Compatibility Issues, Spanning-Tree Protocol Enhancements using Loop Guard and BPDU Skew Detection Features, Understand and Configure the Unidirectional Link Detection Protocol (UDLD) Feature, Using PortFast and Other Commands to Fix Workstation Startup Connectivity Delays, Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation, Upgrade Software Images and Working with Configuration Files on Catalyst Switches, Technical Support & Documentation - Cisco Systems. 11 0 obj The Cisco Catalyst IR1101 Rugged Series Router is a next generation modular industrial router which has a base module with additional Pluggable Modules that can be added. An STP loop is created when an STP block port in a redundant topology erroneously transitions to the forwarding state. 11:42 AM 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. 03-01-2019 The switch does not know that the link ingressdirection is bad (the port thinks that the link is up and works). /Type /Annot Common Causes:This includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts. Note: To access tools and websites, you must be a registered Cisco client. Set the duplex to full-duplex. For a single interface.Cisco-Switch#show int g1/0/7 Last input never, output 1y25w, output hang never, For all interfaces.Cisco-Switch#show int | in Last | proto, I think this command will give u the uptime of that interface. LCP-SW1: Mar 01 09:01:09 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up, LCP-SW1: Mar 01 09:01:21 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down, LCP-SW1: Mar 01 09:01:28 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up. /F 27 0 R Reduce the traffic load on the interface if you see the number of packets increase in these fields. Check for loose connections. Note: PortFast also bypasses spanning-tree calculations on the port, and is therefore only suitable for use on a host port. 04:30 PM Network or host unreachableIf there is no entry in the route table for the host or network, a network or host unreachable message is returned. Giant frames are defined as any frame over the maximum size of an ethernet frame (larger than 1518 bytes) that has a bad FCS. Support for jumbo and baby giants on Catalyst switches varies by switch platform, sometimes even by modules within the switch. Use these resources to familiarize yourself with the community: Customers Also Viewed These Support Documents. Note: Use this Recover Errdisable Port State on Cisco IOS Platformsfor more information on errdisable status on switches that run Cisco IOS. The Layer 2 Traceroute utility does not work with Token Ring VLANs, or when multiple devices are attached to one port via hubs, or when multiple neighbors are on a port. /Metadata 4 0 R INZA.@iQ/eY}`9@deB;r2.5I>/k^'`P(YTqSIuhBj6c/
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/iJ}#!s;Z7)z5A2AY+}qEVV"'W$Rd9}rol0)^}q{Fm>%,$N4A9$:[!\v;< @QOi"q8ITnV2abvyY;z2js^wB>_T m*wHQOWB-G`\ O;}ww ?PxWEs?\xKa[,bvZ,h"0.uB[bT\uOU|eL;HLQXdh8j>A . 12 0 obj Wheb ports or interlaces are shut down as a result of errdisable are referred to as causes in Cisco IOS. endobj In Cisco IOS, you can use theswitchport hostcommand to disable channeling and to enable spanning-tree portfast and theswitchport nonegotiatecommand to turn off DTP negotiation packets.
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