<< Multiple splices and substandard fiber-optic cable reduce the cable distances. This table shows an example of the commands used to configure verify and troubleshoot the errdisable status on switches. A jabber is a frame longer than 1518 octets (which exclude frame bits, but include FCS octets), which does not end with an even number of octets (alignment error) or has a bad FCS error. You must either enable or disable link negotiation on both ends of the link. Collisions in a half-duplex environment are normal expected behavior. The issue is because the traffic load destined for the switch is excessive and causes the frames to be discarded. Switch#show port-security interface fastEthernet 0/1 Port Security : Disabled. 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. ), how to connect the different cables, and which cables are used by most Cisco switches and modules, refer to Catalyst Switch Cable Guide . Theshow interfaces counters errorscommand is used in Cisco IOS to display the output of the interface errors only. endobj /Kids [54 0 R 55 0 R 56 0 R 57 0 R] If the link operates at full-duplex, the collision counter is not active. This is useful to know when a dead interface failed. /Dest (G1030299) This difference in detection time is based on the IEEE standards. The half-duplex side only expects packets at certain times, not at any time, and therefore counts packets received at the wrong time as collisions. Thanks for this! Ping will return one of the following responses: Normal responseThe normal response (hostname is alive) occurs in 1 to 10 seconds, depending on network traffic. There are two status elements to detect a link being usable or not: Status and Line Protocol. Description:show interfaces counters errors. /Rect [162 490.9200134277 306.8999938965 502.1400146484] For GigabitEthernet system requirements as well as Gigabit Interface Converters (GBICs), Coarse Wavelength Division Multiplexing (CWDM), and Small Form-Factor Pluggable (SFP) system requirements, refer to these: System Requirements to Implement Gigabit Ethernet on Catalyst Switches, Catalyst GigaStack Gigabit Interface Converter Switch Compatibility Matrix, Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix, Cisco 10-Gigabit Ethernet Transceiver Modules Compatibility Matrix. Share Improve this answer Follow answered Sep 21, 2011 at 10:46 Theo 1,632 12 12 Add a comment 3 This might be a very late reply but here's what I understood so far: The interface status has two parts to it: Interface and Hardware Components Configuration Guide, Cisco IOS XE In order to check to see how long the port is in, Last input 00:00:41, output 00:00:00, output hang never, Last input never, output never, output hang never. i see. The data cannot be transferred to the chip fast enough to keep pace with output rate. /Dest (G1019941) /Dest (G1040467) You must apply configuration commands to the appropriate module. /ModDate (D:20110317115332Z) endobj /Border [0 0 0] If collisions increase dramatically, this points to a highly utilized link or possibly a duplex mismatch with the attached device. The switch does not know that the link ingressdirection is bad (the port thinks that the link is up and works). Try to find the offending device and remove it from the network. Use theshow run interfacecommand and check to see if the interface is in ashutdownstate: If the port goes into shutdown mode immediately after a reboot of the switch, the probable cause is the port security setup. 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. 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 The second router sees a TTL value of 1, discards the datagram, and returns the time-exceeded message to the source. The switch will reflect that behaviour and you'll see a link go down/up two times. 14 0 obj If you load a newer software version, it can often fix this. Command to see Switchport Uptime - Cisco Community >> 20 0 obj Note: Refer toUsing Portfast and Other Commands to Fix Workstation Startup Connectivity Delaysfor more information how to fix startup delays. Newer Cisco IOS contain a count parameter that can count lines which match a regex. To use this feature, you must install the application on the client accessing the switch and you must configure SSH the switch. 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. Check or swap the copper or fiber cable. Bypass the patch panel if possible to rule it out. This is useful to know when a dead interface has failed. 06:17 PM The number of times the carrier was lost in transmission. PDF Checking Port Status and Connectivity - cisco.com To monitor inbound and outbound traffic on the port as displayed by the next output, for unicast, multicast, and broadcast traffic. >> Hardcode both ends of the link to full duplex so that the negotiation mismatch can be avoided. In the example, under the show interfaces FastEthernet0/1 command, look at a line that shows something such as: Last input 00:00:41, output 00:00:00, output hang never. If the segment is shared, other devices on this segment can transmit so much that the switch has no opportunity to transmit. This can also occur if a switch is connected to port 0/1 and starts to flood packets to all of its ports to learn MAC addresses. Share Improve this question Follow asked Aug 23, 2015 at 6:13 ae41 24 0 obj The Canonical Format Indicator (CFI) bit in the TCI of an 802.1q frame is is set to 0 for the ethernet canonical frame format. /Type /Catalog Violation Mode : Shutdown. The frames received that are smaller than the minimum IEEE 802.3 frame size (64 bytes for Ethernet), and with a bad CRC.Common Causes:This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device.Platform Exceptions:Catalyst 4000 Series that run Cisco IOSPrevious to software Version 12.1(19)EW, a runt = undersize. endobj switch# show vtp status VTP Version : 1 Configuration Revision : 0 . >> 29 0 obj /R [389 625 575 696] Share Improve this answer Follow answered May 19, 2016 at 14:08 Ron Maupin 97.5k 26 112 188 << Try the following commands. Note: Use this Recover Errdisable Port State on Cisco IOS Platformsfor more information on errdisable status on switches that run Cisco IOS. Port Status : Secure-down. For Cisco IOS, on modular switches like the Cat6000, use the commandshow diagnostics. Note: There is, an Out-Discard counter in the Cisco IOSshow interfaces counters errorscommand which is explained inTable 1.