/Filter /FlateDecode Refer toUnderstand and Configure the Unidirectional Link Detection Protocol (UDLD) Featurefor configuration information on UDLD. This command displays what cards are present in the switch, the version of software they are that run, and what state the modules are in: ok, faulty, and so on. 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 number of received packets discarded because there is no buffer space.Common Causes:Compare with ignored count. This situation creates a loop. If a packet is sent from any other port, in the same VLAN as port 0/2, the packet is dropped. << The counter also increments when the destination address of the packet is learned on the port that the packet was received on. If you have the output of the supported commands from your Cisco device, you can use Cisco CLI Analyzer to display potential issues and fixes. >> /Rect [162 388.9200134277 312.299987793 400.1400146484] /Dest (G1063442) /Parent 3 0 R This indicates that a corruption of the packet occurred within transfer, and Blackwater received the corrupted packet. In privileged executive mode, the ping command allows you to specify the packet size, packet count, and the wait time. 04:20 PM. /Kids [14 0 R 15 0 R] 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. Traceroute starts by sending a User Datagram Protocol (UDP) datagram to the destination host with the TTL field set to 1. /title (Checking Port Status and Connectivity) If the port is in a VLAN by itself, and no other ports on the switch belong to that VLAN, all inbound packets are dropped and the counter increments. /Parent 5 0 R 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. The line protocol up message shows the data link layer status of the interface and says that the interface can send and receive keepalives. But the problem is that this OID returns "1:up" as soon as a cable is plugged into the port and does not reflect the different status the port might have including: Blinking green: Link has activity Solid amber: Port is faulty etc, Any clue or hint on which OIDs I should use? Generally, a one percent ratio of errors to total traffic is acceptable for half-duplex connections. 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: Refer toInterface/Module Connectivity Problemsfor more information on oversubscription. Verify that the connected device operates correctly. For more information on software compatibility, use the Software Advisor tool. In the given example, how long has the port been up? If a port just acquired a link, there is a very brief (less than one second) period where inbound packets are not forwarded. You must either enable or disable link negotiation on both ends of the link. This table shows an example of the commands used to configure verify and troubleshoot the errdisable status on switches. Gigabit Ethernet (1000 Base-X) uses 8B/10B Encoding to translate 8bit data from the MAC sublayer(layer 2) to a 10bit Symbol to send over the wire. Check the port status on both sides. For Cisco IOS, use theshow interfacescard-type {mod/port}trunkcommand to verify the trunking configuration and Native VLAN. 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. 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. As the half-duplex side transmits, the full duplex side does not wait its turn and transmits simultaneously which causes a late collision. An image can have become corrupted. /Border [0 0 0] The mode-conditioning patch cord prevents the over use of the receiver for short lengths of MMF and reduces differential mode delay for long lengths of MMF. HWOw6SE4[ilX}{HPV]~Pz+g f~3Qk6V-s*/|l
Km2NF%~IbQ9-t&39/Y-.L6yI*->N Use these resources to familiarize yourself with the community: Customers Also Viewed These Support Documents. Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in theshow interfacecounters for the VLAN interface. Information is displayed about all Catalyst 4000 family, Catalyst 5000 family, and Catalyst 6500 series switches that are in the path from the source to the destination. 25 0 obj 14 0 obj When the local engineer was unplugging the cable, checking port LEDs etc on the CN side we could see the below, so it was definitely recognising the cable being unplugged even from the switch side only. Giant frames are defined as any frame over the maximum size of an ethernet frame (larger than 1518 bytes) that has a bad FCS. If single connection or Step 3 fails with SC connectors, loop the port back to itself (port one RX goes to port one TX). For more details on the different types of cables/connectors, cable requirements, optical requirements (distance, type, patch cables, and so on. Description:show interfacescounter. << Other possible causes of data link errors at full-duplex are bad cables, faulty switch ports, or NIC software/hardware issues. endobj 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. 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. 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. 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. /Dests 10 0 R The Catalyst enterprise LAN switches are multimodule systems. << Although the values of the counters are largely accurate, they are not very precise by design. Platform Exceptions:Catalyst Cat4000 Series that run Cisco IOSPrevious to software Version 12.1(19)EW, the giants counter incremented for a frame > 1518bytes. Thanks for this! Broadcast storms can often be responsible for these events. The results of a duplex mismatch are extremely slow performance, intermittent connectivity, and loss of connection. The | include connected shows only the lines of the output that contain the word "connected". Trunk links between a switch and a router can make the switchport go down. If either device has multiple Gigabit ports, connect the ports to each other. Cisco IOS has the option to use theglobal spanning-tree portfast defaultcommand to automatically apply portfast to any interface configured as a layer 2 access switchport. /Border [0 0 0] To use this feature, you must install the application on the client accessing the switch and you must configure SSH the switch. endobj The size of this buffer is only 16 KB. >> traceroute [-n] [-w wait_time] [-i initial_ttl] [-m max_ttl] [-p dest_port] [-q nqueries] [-t tos] host [data_size]. ^ %-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 Description:show interfaces counters errors. 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. Note: Use this Recover Errdisable Port State on Cisco IOS Platformsfor more information on errdisable status on switches that run Cisco IOS. Reconfigure the trunk encapsulation on both devices. 27 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. >> Using Secure Shell Encryption for Telnet Sessions. This means that if the 2 collision frames counter incremented, the switch attempted to send the packet twice and failed but was successful on its third attempt. the NIC cards in your machines going to sleep because of inactivity. The Carri-Sen (carrier sense) counter increments every time an Ethernet controller wants to send data on a half-duplex connection. Try to find the offending device and remove it from the network. 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 Use theshow interfaces counters errorcommand to look at OutDiscards. >> /Nums [0 32 0 R] The number of times multiple collisions occurred before the interface transmitted a frame to the media successfully. Description:show interfacesand show interfaces counters errors. For a 10 Mbit/s port this is later than 512 bit-times into the transmission of a packet. 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. << 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. In order to resolve this, change the mode of the switch port tostatic accessortrunkas per your requirement. Reduce the traffic load on the interface if there are incrementsin the number of packets in this field. The runt counter only incremented when a frame less than 64 bytes was received. What can cause "FastEthernet is up, line protocol is down" on a Cisco /Author (ctsadmin-p.gen) setup auto speed/duplex on one side and 100/Full-duplex on the other side is also a misconfiguration and can result in a duplex mismatch. Share Improve this answer Follow answered May 19, 2016 at 14:08 Ron Maupin 97.5k 26 112 188 >> Note: Variables that can affect routing (for example, load and reliability) are not cleared when the counters are cleared. stream
/Length 13 0 R endobj 04:30 PM Make sure your L3 addressing on the end device and on the router/ L3 switch is correctly configured. The resolution is that ordinarily the system recovers automatically. /Kids [42 0 R] Use these resources to familiarize yourself with the community: Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. sh ip protocols - all of the dynamic routing /First 12 0 R /Type /Annot Alignment errors are due to the frame that is not completely copied to the wire, which results in fragmented frames. Note: There is, an Out-Discard counter in the Cisco IOSshow interfaces counters errorscommand which is explained inTable 1. /Subtype /Link The command output displays all active console port and Telnet sessions on the switch. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and 3750 series. 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. 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. The software version is also a factor. These messages generally tell you what the mismatch is and where it occurs. For Catalyst 3750, 3550, 2970, 2950/2955, 2940, and 2900/3500XL switches use the command show controller ethernet-controller to display traffic counter and error counter output that is similar to theoutput for Catalyst 6000 series switches. This commanda display the 32-bit and 64-bit error counters per port or interface. Both devices must use the same type of GBIC to establish link. SeeTable 1for explanations of the error counter output. A single broken wire or one shutdown port can cause the problem where one side has a link light, but the other side does not. 1999-06-15T14:05:19Z This shows the last time a port sent or received traffic. In order to resolve this issue, complete these steps: Make sure Cisco Discovery Protocol (CDP) runs between the switch and router and both can see each other. 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. If you have device A connected to device B over a Gigabit link, and the link does not come up, perform this procedure. ), 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. Verify distance and cable used per GBIC as defined in this table. This ensures that the MAC address table (the CAM table) contains the most recent entries. /Count 24 /Rect [162 337.9200134277 311.1000061035 349.1400146484] If collisions increase dramatically, this points to a highly utilized link or possibly a duplex mismatch with the attached device. So, a small number of No buffers frames is not a cause for concern. 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. In switches that support both L3 interfaces and L2 switchport, the message"Command rejected: [interface] not a switching port"displays when you try to enter a command related to layer 2 on a port that is configured as a layer 3 interface. 6. When the VLAN is already in fast aging, EARL cannot set the VLAN to fast aging, and aging timer set process is blocked. 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. 12 0 obj 4 0 obj In order to see POST results per module, use theshow diagnostics modulecommand. >> Always ground the cables (especially in new cable runs) to a suitable and safe earth ground before you connect them to the module. Refer toUnderstanding and Configuring VLAN Trunk Protocol (VTP)for more information on VTP. The issue occurs when an excessive amount of traffic is processed by the Fast Ethernet interface. Hardware is AmdFE, address is 000e.8485.8820 (bia 000e.8485.8820) . This traffic level constrain is due to hardware limitation. PDF Checking Port Status and Connectivity - Cisco The port is functioning well just odd to see these log. This is only required if end-devices such as older Gigabit NICs are used which cannot support IEEE 802.3z. /Border [0 0 0] /Rect [162 405.8999938965 319.799987793 417.1199951172] /Rect [162 490.9200134277 306.8999938965 502.1400146484] >> /Metadata 4 0 R 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 The port LED is set to the orange color and, when you issue the show interfaces command, the port status shows as Errdisabled. Bypass the patch panel if possible to rule it out. The interaface also shows a UP/UP state. Check the results ofshow modulefor Catalyst 6000 and 4000 series switches that run Cisco IOS. /Rect [162 371.8800048828 250.3800048828 383.1600036621] This is useful to know when a dead interface has failed. /docType () For each Catalyst 4000 family, 5000 family, and 6500 series switch found in the path, the output shows the device type, device name, device IP address, in port name, in port speed, in port duplex mode, out port name, out port speed, and out port duplex mode. << 06-22-2009 Description:show interfacescounter. endobj This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. The CDP packets are no longer recognized, and they are dropped. The number of failed buffers and the number of buffers swapped out.Common Causes:A port buffers the packets to the Tx buffer when the rate of traffic switched to the port is high and it cannot handle the amount of traffic. You can need to modify your network topology to reduce the traffic load for this switch. /B [27 0 R 28 0 R] This chapter includes the following major sections: Checking Module Status, page 6-2 Checking Interfaces Status, page 6-2 Displaying MAC Addresses, page 6-3 Checking Cable Status Using TDR, page 6-3 Using Telnet, page 6-5 /Dest (G1060208) (Year 1993), 1 link ups, last link up on Mon Mar 01 1993, 00:01:37 1 link downs, last link down on Mon Mar 01 1993, 00:03:13. is the year/date not updated due to no NTP or local clock configured? This chapter describes how to check switch port status and connectivity on the Catalyst enterprise LAN switches. Collisions in a half-duplex environment are normal expected behavior. The number of frames dropped on an interface because the CFI bit is set. Therefore, this sum cannot balance with the sum of enumerated input error counts. Specify a shorter period of time to get an accurate read (to better detect traffic bursts for example and issue theload-interval interface command. /Subtype /Link For Cisco IOS, on modular switches like the Cat6000, use the commandshow diagnostics. Port status as seen in the default dashboard color mode. /Type /Annot >> /Last 44 0 R Follow the below . Verify the cable selection. /Pages 5 0 R This error message is caused when a frame is transmitted, and the local buffer of the controller chip local buffer receives insufficient data. Port status up and down and up again - Cisco These delays are caused by STP, trunking negotiations (DTP), and EtherChannel negotiations (PAgP). You can see what modules are installed, as well as the MAC address ranges and version numbers for each module, by using the show module command. Normally, such a condition is temporary, dependent upon transient peak loads within the system. Investigate these common causes of output buffer failures: Inferior Speed/Duplex for the Amount of Traffic. You can change the topology to route frames differently. If a packet cannot be completely received because the switch is out of packet buffers, this counter is incremented once for every dropped packet. The number of valid size frames with Frame Check Sequence (FCS) errors but no frame errors. After 16 attempts have been made to send the packet the packet is dropped, and the counter increments. The designated port transmits BPDUs, and the non-designated port receives BPDUs. Undersize = frame < 64bytes. Swap suspect GBIC with known good GBIC. When you have devices that need to carry a large amount of traffic through that interface, consider the use of one port of each group so that the common circuitry that shares a single group is not affected by this amount of traffic. This document describes how to determine why a port or interface experiences problems. The number of times one 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. Description:show interfacesandshow interfaces counters errors. Use theinterface-rangecommand to do this on multiple interfaces at once. Every port in a Layer 2 switch belongs to a VLAN. 13 0 obj 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. Find answers to your questions by entering keywords or phrases in the Search bar above. Bad Port or Module Port or Interface or Module not enabled. endstream Enter both the module number and the port number to see detailed information about the specified port. . If neither auto-negotiation or hardcode setupseem to work, there can be a problem with the firmware or software on your NIC card. In SPA modules, after you create a sub interface with 802.1Q, the same VLAN is not usable on the switch. /Dest (G1020140) /P 6 0 R This example shows the basic usage of the traceroute command: This example shows how to perform a traceroute with six queries to each hop with packets of 1400bytes each: Catalyst 4500 Series Software Configuration Guide, 7.5, Configuring the Switch IP Address and Default Gateway, Configuring Ethernet and Fast Ethernet Switching, Configuring Fast EtherChannel and Gigabit EtherChannel, Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard, Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports, Configuring Dynamic VLAN Membership with VMPS, Catalyst 4500 Series, Catalyst 2948G and Catalyst 2980G Switches Software Configuration Guide, 7.5, "Configuring the Switch IP Address and Default Gateway. You can show all the interfaces in a Cisco switch with the same command you are using. This example shows how to display information about the ports on a specific module only: This example shows how to display information on an individual port: In addition to displaying the MAC address range for a module using the show module command, you can display the MAC address of a specific port in the switch using the show port mac-address command. << NIC Card on your devices. 5. /Count 23 Helpful with the search for software/hardware incompatibilities (with theRelease NotesorSoftware Advisor) and bugs (with theSoftware Bug Toolkit). All of these protocols can be disabled for access ports where they are not needed, so the switch port or interface starts forwarding packets a few seconds after it establishes a link with its neighbor device. If steps 3 and 4 are successful, but a connection between device A and B cannot be established, loop ports with the cable that adjoins the two devices. When the cable is first connected to the port, some of these errors can occur. You can search known software bugs with the Software Bug Toolkit. The purpose of SPD is to ensure that important control packets, such as routing updates and keepalives, are not dropped when the IP input queue is full. Check the Command Reference for your release of software to verify the availability of this command. The show interfaces card-type {slot/port}command is the used command for Cisco IOS on the Supervisor to display error counters and statistics. /T 7 0 R The number of times the carrier was lost in transmission. The issue occurs when Encoded Address Recognition Logic (EARL) is unable to set the CAM aging time for the VLAN to the required number of seconds. 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. output buffer failures output buffers swapped out. show interface status - Cisco 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. On a Catalyst 4510R series switch, in order to enable both the 10-Gigabit Ethernet and the Gigabit Ethernet SFP uplink ports, there is an optional configuration. The traffic load on the interface is excessive and causes the frames to be discarded. 3506 Cisco IOS error counter output forshow interfacesorshow interfaces counters errorsfor the Catalyst 6000 and 4000 Series. endobj Therefore, the switch discards such frames. /Type /Annot >> /Title (Checking Port Status and Connectivity) Normally the deferred frames are the number of frames that have been transmitted successfully after waiting for the media, because the media was busy. >> The total number of frames which are filtered because of the type of VLAN information contained in the frame. 24 0 obj To display summary information on all of the ports on the switch, enter the show port command with no arguments. Theshow counters interfacecard-type {slot/port}command was introduced in Cisco IOS software version 12.1(13)E for the Catalyst 6000 series only, it offers even more detailed statistics for ports and interfaces. recently I have noticed my switches are showing log when I connect a new device to it. Port status as seen in the color assist mode. The Pluggable Module provides the flexibility of adding different interfaces to the IR1101 platform, for example, a cellular module. This utility determines the path by looking at the forwarding engine tables of the switches in the path. I don't think this command actually woks.
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