You must enable CDP on all of the Catalyst 4000 family, Catalyst 5000 family, and Catalyst 6500 series switches in the network. This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. This situation creates a loop. /Metadata 4 0 R Also you can use (it is disruptive for the port): test cable-diagnostics tdr interface xx/yy and then You can display the currently active user sessions on the switch using the show users command. /V 27 0 R Last clearing of"show interface" counters - The last time the clear counters command was issued since the last time the switch was rebooted. This document applies to Catalyst switches that run on Cisco IOS System Software. Note: Some switches show a steady orange (amber) light on each port when this happens. Bad NICs can also cause late collisions. If the Rx still works on the queue, once the interval time expires, the Tx sends a new pause frame again with a new interval value. Small amounts of symbol errors can be ignored. Check the port status on both sides. endobj 09-26-2014 If the segment is shared, other devices on this segment can transmit so much that the switch has no opportunity to transmit. The resolution is that ordinarily the system recovers automatically. 06-22-2009 Make sure the ports on the devices that are connected together are both SMF, or both are MMF ports. The rcv-err counter on a 5K only increments as a result of excessive traffic. For example, here you see a high amount of output drops on the interface GigabitEthernet 8/9 on a Catalyst 6500 Series Switch: In order to analyze the problem, collect the output of these commands: show platform hardware capacity rewrite-engine drop. No action is required. This indicates that a corruption of the packet occurred within transfer, and Blackwater received the corrupted packet. Destination unreachableIf the default gateway cannot reach the specified network, a destination unreachable message is returned. endobj After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. For the duplex mismatch scenario, the late collision is seen on the half-duplex side. Text Common Causes:Broadcast storms and bursts of noise can cause the ignored count to be increased. Description:show interfacescounter. If this does not solve the issue, you need to consider a module without any oversubscription of ports. For example, if a static map for MAC address X was configured on port 0/2 to forward traffic to port 0/3, the packet must be received on port 0/2 otherwise the packet is dropped. The data cannot be transferred to the chip fast enough to keep pace with output rate. That's how they behave. >> Cisco Catalyst IR1101 Rugged Series Router. >> The current implementation of SSH supports version 1, both the data encryption standard (DES) and 3DES encryption methods, and can be used with RADIUS and TACACS+ authentication. FCS errors are the result of collisions at half-duplex, a duplex mismatch, bad hardware (NIC, cable, or port), or connected devices that generate frames that do not end with an octet and have a bad FCS. /Last 44 0 R /Dests 10 0 R Refer to theCatalyst Switch Cable Guide. /Filter /FlateDecode (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? 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. The excessive collisions counter increases after 16 consecutive late collisions have occurred in a row. Description:show interfacescounter. Share New here? 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. /Type /Annot Note: Refer toUsing Portfast and Other Commands to Fix Workstation Startup Connectivity Delaysfor more information how to fix startup delays. The total number of frames received whose length exceeds the System MTU, yet which have good FCS values. 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. 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. Layer 1 goes down and then up. Without attenuators, the minimum link distance is 24.9 miles (40 km). The switch will reflect that behaviour and you'll see a link go down/up two times. 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. Description:For the Catalyst 6000 Series only - show interfaces counters error.Common Causes:See Platform Exceptions.Platform Exceptions:Catalyst 5000 Seriesrcv-err = receive buffer failures. << The software version is also a factor. If the switch overwhelms the Ethernet interface, check the speed and duplex setup. Just issue the 'show interface fx' command and look under 'Last input/Last output. These types of errors on the interface are related to a traffic problem with the ports oversubscribed. 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. In order to convert the interface from layer 3 mode to layer 2 mode, issue the interface configuration commandswitchport. When you use an LX/LH GBIC with 62.5-micron diameter MMF, you must install a mode-conditioning patch cord (CAB-GELX-625 or equivalent) between the GBIC and the MMF cable on both the transmit and receive ends of the link. Set the duplex to full-duplex. The show interfaces card-type {slot/port}command is the used command for Cisco IOS on the Supervisor to display error counters and statistics. To ping a host in a different IP subnetwork, you must define a static route to the network or configure a router to route between those subnets. 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. /Border [0 0 0] Displays Cisco Technical Support information about EtherChannels. It is usually easier to upgrade the software than it is to upgrade hardware. Jumbos have larger frame sizes, typically > 9000 bytes. /Rect [162 371.8800048828 250.3800048828 383.1600036621] Note:Some port LEDs of the platform work differently in regard to STP. 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. Once you have encapsulation dot1q on a subinterface, you can no longer use that VLAN in the system because the 6500 or 7600 internally allocates the VLAN and makes that sub interface its only member. This area consists of the fiber core plus a small portion that covers the cladding. The default CAM aging time is five minutes, which means that the switch flushes the table of learned MAC addresses every five minutes. Use theshow versioncommand to verify the current software version along with thedir flash: ordir bootflash: (dependent upon the platform) command to verify the available flash memory for the upgrade: For information on how to upgradesoftware for your Cisco Switches, navigate to link, choose your platform and look at the Software Configuration section. Use theclear counterscommand to zero the traffic and error counters so that you can see if the problem is only temporary, or if the counters continue to increment. endobj 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). /Rect [162 473.8800048828 315.8999938965 485.1600036621] Baby Giant frames are just slightly larger than the maximum size of an ethernet frame. This chapter describes how to check switch port status and connectivity on the Catalyst enterprise LAN switches. /Author (ctsadmin-p.gen) Table 1. If unicast flooding is enabled on that port, it can cause the port to shut down after a reboot. ), 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. The ping command is configurable from normal executive and privileged executive mode. Acrobat Distiller 7.0 (Windows) Collisions in a half-duplex environment are normal expected behavior. If Rx-No-Pkt-Buff increments and TxPauseFrames also increments, it means that the remote end disregards the pause frames (does not support flow control) and continues to send traffic despite the pause frames. This is not available on all IOS versions. To enable SSH on the switch, perform this task in privileged mode: This example shows how to create the RSA host key: The nbits value specifies the RSA key size; the valid key size range is from 512 to 2048 bits. Verify the cable selection. For example, you have a switch that has two Gigabit ports. >> /Rect [162 456.8999938965 320.8200073242 468.1199951172] 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. So, a small number of No buffers frames is not a cause for concern. Traceroute starts by sending a User Datagram Protocol (UDP) datagram to the destination host with the TTL field set to 1. Total MAC Addresses : 0. The total number of frames whose transmission attempt is abandoned due to insufficient resources. This example shows the source and destination MAC addresses specified, with no VLAN specified but with the detail option specified. Category 3 copper cable can be used for 10 Mbps unshielded twisted pair (UTP) connections but must never be used for 10/100 or 10/100/1000Mbps UTP connections. 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. 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. This example of theshow run interfacecommand shows the unknown protocol drops on the GigabitEthernet 0/1 interface. Note: For 2900/3500XL Series switches use theshow interfacescard-type {slot/port}command with theshow controllers Ethernet-controllercommand. Spanning Tree Protocol (STP) loops can cause serious performance issues that masquerade as port or interface problems. When a device is connected to a switchport .. %LINK-3-UPDOWN messages in the log show when the port status. This can happen where you have multiple high-speed ports flowing to a single (usually slower) port. IOS (tm) C2950 Software (C2950 . Broadcast storms can often be responsible for these events. The number of frames that have been transmitted successfully after they wait because the media was busy.Common Causes:This is usually seen in half-duplex environments where the carrier is already in use when it tries to transmit a frame. /Dest (G1019941) /Count 24 When a host receives a datagram with an unrecognized port number, it sends an ICMP port unreachable error to the source. The easiest way on Cisco switches is: show int status This will show you the link status for all ports The 45xx line has also some additional useful commands: show int link which will show you the last time the link was active. Description:sh interfacescounter. The number of times the carrier was lost in transmission. 25 0 obj To apply configuration commands to a particular port, you must specify the appropriate logical module. Always use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000Mbps connections. The interface displays a lot of information including a visual representation of each port's status. Common Causes: This error can indicate a duplex mismatch among other things. WK:w9\lBdOeX>V!RKB.GUMrx8<3pfs,nNX`IVw=OYGe; L2]>[1aUGYv4(}d({PJRiPh@fHK49]a9l&]+X.H bVFO4 i8qQf3 The total number of frames whose first transmission attempt was delayed, due to traffic on the network media. /Type /Annot >> Run a port TDR to test the integrity of the copper cable. Check the IP address, subnet mask, default gateway, dynamic routing protocol configuration, static routes, and so on. Descriptions:show interfacescounter. 29 0 obj Warning: Disable auto-negotiation and this hides link drops or physical layer problems. Reduce the traffic load on the interface if you see the number of packets increase in these fields. If a port is blocked by Spanning Tree Protocol (STP), most packets are not orwarded, which results in No dest packets. This chapter includes the following major sections: Checking Module Status, page 5-1 Checking Interfaces Status, page 5-2 Checking MAC Addresses, page 5-3 /Subtype /Link /keywords () /Border [0 0 0] 10 0 obj << /Rect [162 354.8999938965 288.1799926758 366.1199951172] Description:show interfacesand show interfaces counters errors. The error message is received when the traffic level reaches about 2.5 Mb. Runt frames or frames received that are less than 64 bytes (which includes the FCS bits and excludes the frame header) and have either an FCS error or an alignment error. This is usually seen in half-duplex environments where the carrier is already in use when it tries to transmit a frame. 15 0 obj %LINK-3-UPDOWN messages in the log show when the port status. Common Causes:Check for a bad cable. Description:show interfaces counters errors. For information about setting the IP address and default gateway, see "Configuring the Switch IP Address and Default Gateway.". The increase in the output buffer failure counters can be a sign that the ports are run at an inferior speed and/or duplex, or there is too much traffic that goes through the port. >> (See "Configuring CDP," for information about enabling CDP.) The Catalyst4912G, 2948G, and 2980G switches are fixed-configuration switches, but are logically modular. /Kids [33 0 R 34 0 R 35 0 R 36 0 R 37 0 R 38 0 R 39 0 R 40 0 R 41 0 R] Fa0/1 connected 1 a-full a-100 10/100BaseTX . This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device. Theshow interfacescommand output up to this point is explained here (in order) : up, line protocol is up (connected) - The first uprefers to the physical layer status of the interface. 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. In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. endobj 14 0 obj /date (2007-05-04T15:24:40.000-07:00) New here? /CropBox [0 0 612 792] 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. This means it is currently not connected to anything, but it can connect if it has a good connection to another operational device. You can search known software bugs with the Software Bug Toolkit. On the 2900/3500XL, 2950/2955, 3550, 2970 and 3750 series switches the equivalent command is show post which displays the results of the switch POST. 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. A link light does not guarantee that the cable is fully functional. 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. Refer to Mode-Conditioning Patch Cord Installation Note for more information. For a 10 Mbit/s port this is later than 512 bit-times into the transmission of a packet. MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, Last clearing of "show interface" counters never, Customers Also Viewed These Support Documents, How to find the port Uptime/Downtime status or utilization in Catalyst 3750 series switches that run Cisco IOS system software. For example, if the port is 10 Mbps, move this device to a 100 Mbps or Gigabit port. (The flushes counter can be used but never increments on the Catalyst 4000 Series that run Cisco IOS.) /Parent 5 0 R << Typically, the output drops can occur if QoS is configured and does not provideenough bandwidth to certain class of packets. Verify that each device supports 802.3z specification for Gigabit auto-negotiation. For each group of eight ports, the frames that are received are buffered and sent to the common Gigabit Ethernet link to the internal switch fabric. show tech-support port-channel. Description:show interfacescounter. InCisco IOS software you have the ability to automatically re-enable a port after a configurable amount of time spent in the errdisable state. 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. This is an example of output from the show interfaces command for an interface: "How long the port is in Up or Down status" is NOT the same thing as "the last time a port sent or received traffic." After you issue this command, configure the port for any layer 2 properties. /N 28 0 R 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. output buffer failures output buffers swapped out. That woud mean that the switchport would not go down even after not getting a response from the connected device for 20 minutes, if that is what you want: In addition, if you just want to get rid of the messages in your log, you can configure the logging discriminator below: logging discriminator LINKSTATUS severity drops 3 facility drops LINK mnemonics drops UPDOWN, logging buffered discriminator LINKSTATUS 100000logging console discriminator LINKSTATUSlogging monitor discriminator LINKSTATUSlogging host 192.168.100.10 discriminator LINKSTATUS, 05-11-2020 - edited endobj Aging Type : Absolute. 17 0 obj The packet is then dropped. An increment in pause input counter means that the connected device requests for a traffic pause when its receive buffer is almost full.Common Causes:This counter is incremented for informational purposes since the switch accepts the frame. Input queue - The number of packets in the input queue.Size/max/drops= the current number of frames in the queue / the max number of frames the queue can hold before it must start to drop frames / the actual number of frames dropped because the max queue size was exceeded.Flushesis used to count Selective Packet Discard (SPD) drops on the Catalyst 6000 Series that run Cisco IOS. In order to pull the exact statistics of the traffic, it is suggested that you use a sniffer to monitor the necessary ingress and egress interfaces. 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. /Dest (G1060208) An obvious but sometimes overlooked cause of port connectivity failure is an incorrect configuration on the switch. >> Cisco Internetwork Operating System Software . The results of a duplex mismatch are extremely slow performance, intermittent connectivity, and loss of connection. If so, the port is good. Note:There is a difference between the counter of show interface command output for a physical interface and a VLAN interface.The input packet counters increment in the output ofshow interfacefor a VLAN interface when that packet is Layer 3 (L3) processed by the CPU. /Names 2 0 R The Catalyst 6000/4000 does not turn the port light orange when it blocks for STP. Use the LEDs on these switches to help you understand the POST results. << Impossible to tell. 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. The port LED is set to the orange color and, when you issue the show interfaces command, the port status shows as Errdisabled. endobj Look at the "sh interface " and "sh controll e " any any line errors. 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). Use theinterface-rangecommand to do this on multiple interfaces at once. Find answers to your questions by entering keywords or phrases in the Search bar above. /Rect [162 422.8800048828 257.2799987793 434.1600036621] Customers Also Viewed These Support Documents. Hardcode both ends of the link to full duplex so that the negotiation mismatch can be avoided. The traceroute facility determines the address of the first hop by examining the source address field of the ICMP time-exceeded message. ), how to connect the different cables, and which cables are used by most Cisco switches and modules, refer to Catalyst Switch Cable Guide . << /concept () Command: show startup-configuration Description: This command is the same as the above show running-configuration command except this will output the configuration that is stored in NVRAM. If the link operates at full-duplex, the collision counter is not active. CDP is useful to detect errors, as well as port and system statistics on nearby Cisco devices. A cable can be just good enough to connect at the physical layer, but it corrupts packets as a result of subtle damage to the wiring or connectors. Always check the cable for marginal damage or failure. Note: There can be differences in the implementation of the counters across various platforms and releases. Number of packets received by the port from the network, where the packets were more than 1514 bytes. Use theshow interfaces statuscommand to display speed and duplex setup as well as other information. 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. Check or swap the copper or fiber cable. Using Secure Shell Encryption for Telnet Sessions. 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
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