cisco show port status up down

When the size of the IP input queue is between the minimum and maximum thresholds, normal IP packets are dropped based on a certain drop probability. 3 0 obj Description:show interfacescounter. It depends on the amount of the packets that are stored in the Rx FIFO buffer of the module ASIC. Use theshow mac address-table dynamiccommand or substitute theinterfacekeyword. It is counted with short traffic bursts flow when some packets fill this buffer. Note: For Catalyst 3750, 3550, 2970 , 2950/2955, and 2900/3500XL Series switches use theshow postcommand, which indicates a simple pass or fail for the hw status. 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. If you have physical access to the switch, it can save time to look at the port LEDs which give you the link status or can indicate an error condition (if red or orange). Description:show interfacescounter. /Subtype /Link If either device has multiple Gigabit ports, connect the ports to each other. You could try and set the keepalive timer on your switchports to something higher than the highest interval seen in your logs, say 20 minutes. 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." /Type /Annot << /Pages 5 0 R Number of packets received by the port from the network, where the packets were more than 1514 bytes. 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. /Parent 5 0 R . Platform Exceptions:Catalyst Cat4000 Series that run Cisco IOSPrevious to software Version 12.1(19)EW, the giants counter incremented for a frame > 1518bytes. 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. Check the Command Reference for your release of software to verify the availability of this command. For more information on software compatibility, use the Software Advisor tool. The most common reason for TCNs is client PCs connected directly to a switch. (Protocol down/up). IOS (tm) C2950 Software (C2950 . endobj Alignment errors are the number of frames received that do not end with an even number of octets and have a bad CRC. After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. endobj Refer toCisco Technical Tips Conventionsfor more information on document conventions. /description () Collisions can cause runts, FCS, and alignment errors due to the frame notcompletely copied to the wire, which results in fragmented frames. Baby Giant frames are just slightly larger than the maximum size of an ethernet frame. << Cisco Internetwork Operating System Software . There are other causes for late collisions besides duplex mismatch, but this is one of the most common reasons. Multiple splices and substandard fiber-optic cable reduce the cable distances. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and 3750 series. It has helped us a lot. The same output show up for trunk ports as well as access ports. Verify Hw and Sw support for this type of GBIC. Description:show interfacescounter. Common Causes:Collisions are normal for interfaces configured as half-duplex but must not be seen on full duplex interfaces. The designated port transmits BPDUs, and the non-designated port receives BPDUs. 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. Look at your logs (if link state logging is enabled) for signs of the interface going down/up. The Carri-Sen (carrier sense) counter increments every time an Ethernet controller wants to send data on a half-duplex connection. /Parent 5 0 R For fiber, make sure you have the correct cable for the distances involved and the type of fiber ports that are used. /Rect [162 456.8999938965 320.8200073242 468.1199951172] 26 0 obj 6. Use theshow interfacecommand for Cisco IOS to look for errdisable, disable or shutdown status. 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. The command output displays all network layer (Layer3) devices, such as routers, that the traffic passes through on the way to the destination. /Border [0 0 0] /Parent 14 0 R For Cisco IOS, you can use the show interfaces command to verify whether the interface is up, line protocol is up (connected) . This means that the port is up as far as Layer 1 (L1) is concerned. Here, the VLAN aging time is already set to fast aging. Alignment errors are due to the frame that is not completely copied to the wire, which results in fragmented frames. 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. Eliminate faulty patch panel connections. 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. Try to find the offending device and remove it from the network. 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. Verify distance and cable used per GBIC as defined in this table. The traceroute command uses the Time To Live (TTL) field in the IP header to cause routers and servers to generate specific return messages. If this counter increments, this is an indication that the ports are configured at half-duplex. )"S\~hiTDsEBE#kX'#,6Ju%[LM_|tU];[uKXA_HC|{LjCLpEt[mD|Waj[Y!9!ITW B5i95l-'@ %!#5CmD&ny ['Pf`a]S [zw W?u<=YX:9C^x@0~]/cA$?gB:WN0!ySp@(X17en}c\=E/miTgcgxF }=n 0&*ik:0zJQe4_S`;~x>m)#9]zf>6}Y=A))}\kg1Nz2?xe%;!49>8sr~GV)R[Ewpv#+bL~L {^gLg+ J*6FU !2voqy7=1*l2WQu$Hhp(to#S(49U:]wh%mdY6< The switch will reflect that behaviour and you'll see a link go down/up two times. 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 issue occurs when an excessive amount of traffic is processed by the Fast Ethernet interface. Jumbos have larger frame sizes, typically > 9000 bytes. 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. FCS error count is the number of frames that were received with a bad checksum (CRC value) in the Ethernet frame. To open a Telnet session to another device on the network from the switch, perform this task in privileged mode: This example shows how to open a Telnet session from the switch to the remote host labsparc: The login timer is the number of minutes after which an idle session is disconnected. Look at the "sh interface <BLAH>" and "sh controll e <BLAH>" any any line errors. Reduce the switch load if thenumber of packets in this field increase. Theshow interfaces counters errorscommand is used in Cisco IOS to display the output of the interface errors only. Rule out any bad patch panel connections or media convertors between source and destination. Refer to Table 1 for explanations of the error counter output. << So, a small number of No buffers frames is not a cause for concern. 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. Refer toConfiguring Jumbo/Giant Frame Support on Catalyst Switchesfor more information on system requirements, configureand troubleshootfor jumbo and baby giant issues. This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device. 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 When you operate at full-duplex, errors in FCS, Cyclic Redundancy Checks (CRC), alignment, and runt counters must be minimal. Also you can use (it is disruptive for the port): test cable-diagnostics tdr interface xx/yy and then No destination multicast are the number of multicast packets that the port did not forward to any other ports. 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. For example, on a Catalyst2948G series switch, the 24Fast Ethernet ports belong logically to module 2. HWOw6SE4[ilX}{HPV]~Pz+g f~3Qk6V-s*/|l Km2NF%~IbQ9-t&39/Y-.L6yI*->N /concept () The excessive collisions counter increases after 16 consecutive late collisions have occurred in a row. << In its operation, STP relies on continuous reception or transmission of BPDUs based on the port role. In order to avoid packet drops on the device connected to the catalyst switch, issue theip cefcommand on the fast Ethernet interface of the device connected to the switch. If the port is a secure port, packets with disallowed source MAC addresses are not forwarded and increment the counter. 3506 /V 58 0 R Use the LEDs on these switches to help you understand the POST results. /Type /Annot This traffic level constrain is due to hardware limitation. In addition, you can use Telnet from the switch to access other devices in the network. The traffic load destined for this switch is excessive and causes the frames to be discarded. Thanks for this! /Creator (FrameMaker 7.2) endobj Typically, the output drops can occur if QoS is configured and does not provideenough bandwidth to certain class of packets. << Port status as seen in the default dashboard color mode. 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. /language (en) The minimum link distance for ZX GBICs is 6.2 miles (10 km) with an 8-dB attenuator installed at each end of the link. This is an indication of a bad frame generated by the connected device. Use theinterface-rangecommand to do this on multiple interfaces at once. For example, a runt, giant, or an FCS-Err does not increment the rcv-err counter. Common Causes:In many cases, this is the result of a bad NIC. /Kids [54 0 R 55 0 R 56 0 R 57 0 R] The first up refers to the physical layer status of the interface. 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. A port remembers what VLAN it is assigned to, even if the VLAN itself is deleted. >> By default, all layer 2 ports are indynamic desirablemode, so the layer 2 port tries to form a trunk link and sends out DTP packets to the remote device. You can change the topology to route frames differently. /Metadata 4 0 R To stop a ping in progress, press Ctrl-C. To ping another device on the network from the switch, perform one of these tasks in normal or privileged mode: ping -s host [packet_size] [packet_count]. endobj The information in this document was created from the devices in a specific lab environment. Change the cable and patch panel cord to ensure that the cable and patch cords are not defective. Collisions must not be seen on interfaces configured as full duplex. 20 0 obj /B [27 0 R 28 0 R] An excessive collision happens when a packet has a collision 16 times in a row. 4. Usually this means there was no packet transfer relative to that entity. 13 0 obj It is caused by protocols that are not understood by the router/switch. On one of my 3750's ports that have never gone down show a 1993 timestamp, ports that have gone up/down have a recent (correct) date, 1 link ups, last link up on Sun Feb 28 1993, 16:01:20, 4 link ups, last link up on Tue Dec 02 2014, 14:51:11. /Rect [162 490.9200134277 306.8999938965 502.1400146484] An STP loop is created when an STP block port in a redundant topology erroneously transitions to the forwarding state. Violation Mode : Shutdown. 05-11-2020 This is useful to know when a dead interface has failed. When a host receives a datagram with an unrecognized port number, it sends an ICMP port unreachable error to the source. Description:show interfacescounter. There are two status elements to detect a link being usable or not: Status and Line Protocol. sh ip traffic - all traffic through the Cisco sh controllers ethernet-controller gi1/0/1 phy - information about the SFP module into a particular port show vlan internal usage - used to show vlan sh inventory raw - in 4924 about stuck SFP seems to be the only way to see. 16 0 obj You must apply configuration commands to the appropriate module. 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. The ping command is configurable from normal executive and privileged executive mode. Try the cable in another port or interface if one is available and see if the problem continues. This is helpful to use to determine whether a misconfiguration of the mod/port or interface can cause a problem. 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. CDP is Cisco proprietary and works when you send packets to a well-known MAC address 01-00-0C-CC-CC-CC. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and and 3750 series. Description:sh interfacescounter. 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. Problems have been seen when you connect to devices manufactured before the IEEE 802.3z standard was ratified. /Type /Annot To monitor inbound and outbound traffic on the port as displayed by the next output, for unicast, multicast, and broadcast traffic. This can lead to slow throughput of packets across the device. 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. Support for jumbo and baby giants on Catalyst switches varies by switch platform, sometimes even by modules within the switch. Undersize = frame < 64bytes. 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. 14 0 obj Refer to theCatalyst Switch Cable Guide. Most Cisco switches have a port in the notconnect state. The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). Displays Cisco Technical Support information about EtherChannels. If a packet cannot be completely received because the switch is out of packet buffers, this counter is incremented once for every dropped packet. You can use this utility from a switch that is not in the Layer 2 path between the source and the destination; however, all of the switches in the path, including the source and destination, must be reachable from the switch. In order to see POST results per module, use theshow diagnostics modulecommand. endobj application/pdf If the FCS, CRC, alignment, or runt counters increment, check for a duplex mismatch. Move the cable to a known good port to troubleshoot a suspect port or module. 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. 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. Common Causes: This error can indicate a duplex mismatch among other things. 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. Refer toInterface/Module Connectivity Problemsfor more information on oversubscription. Dispersion-shifted single-mode fiber-optic cable. 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. 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. The Maximum Transmission Unit (MTU) of the data portion of an ethernet frame is 1500 bytes by default. Run a port TDR to test the integrity of the copper cable. /I 31 0 R Refer toUnderstanding and Configuring VLAN Trunk Protocol (VTP)for more information on VTP. This utility determines the path by looking at the forwarding engine tables of the switches in the path. Destination does not respondIf the host does not respond, a no answer message is returned. 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. switch# show port-channel summary Flags: D - Down P - Up in port-channel (members) I - Individual H - Hot-standby (LACP only) . Late collisions can also indicate an Ethernet cable or segment that is too long. The Rx-No-Pkt-Buff does not depend on the total traffic rate. The total number of frames which are filtered because of the type of VLAN information contained in the frame. This is usually seen in half-duplex environments where the carrier is already in use when it tries to transmit a frame. << Description:show interfacescounter. Refer to Mode-Conditioning Patch Cord Installation Note for more information. In order to resolve this issue, Cisco has developed the PortFast feature for host ports. Switchport status changes.. when a connected device goes sleep (e.g printer) or users shutdown their PC/laptops. Cisco Catalyst IR1101 Rugged Series Router. Use theshow cdp neighborscard-type detailcommand to display CDP information for Cisco neighbor devices. /PageLabels 8 0 R 06-22-2009 If this counter increments, it is an indication of a wiring problem, an excessively loaded network, or a duplex mismatch. Change the software first. The port is functioning well just odd to see these log. >> The number of times the receiver on the port is disabled, possibly because of buffer or processor overload. If BPDUs are not received on a non-designated port, and loop guard is enabled, that port is moved into the STP loop-inconsistent block state, instead of the listening / learning / forwarding state. This difference in detection time is based on the IEEE standards. The operating system can have a bug. 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. If you load a newer software version, it can often fix this. When the VLAN is already in fast aging, EARL cannot set the VLAN to fast aging, and aging timer set process is blocked. Unknown protocol dropsis a counter on the interface. A broken fiber cable or other cabling/port issues can cause this one-way only communication. For example, if you have two routers connected and you disable CDP on one router interface, this results in unknown protocol drops on that interface. 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. /Names 2 0 R Description: show interfaces and show interfaces counters errors.The number of times a collision is detected on a particular interface late in the transmission process. If the segment is shared, other devices on this segment can transmit so much that the switch has no opportunity to transmit. Someone else in the community shared this with me quite awhile back. Fa0/1 connected 1 a-full a-100 10/100BaseTX . See the Common Port and Interface Problems section of this document for more information. No destination broadcast are the number of broadcast packets that the port did not forward to any other ports. endobj Without the loop guard feature, the port assumes the designated port role. Bad NICs can also cause late collisions. Packet loss causes retransmissions at the transport layer which in turn causes users to experience latency at the application level. Trace a Layer 2 path using IPaddresses or IP aliases. Warning: Category 5e and Category 6 cables can store high levels of static electricity because of the dielectric properties of the materials used in their construction. Is there a command that will show information as to how long that port has been in an "up" state? Verify the cable selection. 0 Helpful Share Reply johnlloyd_13 Engager Options 09-27-2014 02:01 AM Hi, This only happens under stress conditions but can happen with bursts of traffic on several ports. << The number of times the receiver hardware was unable to hand received data to a hardware buffer. /Border [0 0 0] Every port in a Layer 2 switch belongs to a VLAN. 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. A late collision occurs when two devices transmit at the same time, and neither side of the connection detects a collision. This message indicates to the traceroute facility that it has reached the destination. The command udld aggressive-mode can be configured on switches that run Cisco IOS (check release notes for command availability) for point-to-point connections between switches where unidirectional links cannot be tolerated. Description:The number of times the receiver hardware was unable to hand received data to a hardware buffer.Common Cause:The input rate of traffic exceeded the ability of the receiver to handle the data. - edited Ifshow interfacesshows up/ line protocol up (connected) but you see errors increment in the output of either command, refer to the Common Port and Interface Problems section of this document for advice. Refer to these documents for more information on the different trunking modes, guidelines, and restrictions: System Requirements to Implement Trunking. For example, with the WS-X4448-GB-RJ45 10/100/1000 switching module, you can connect ports from different groups, such as ports 4, 12, 20, or 30 (in any order), before you connect ports from the same group, such as ports 1, 2, 3, 4, 5, 6, 7, and 8. Impossible to tell. This shows the last time a port sent or received traffic. It is this configuration that is loaded into memory when the device is first booted. /Count 4 /Dest (G1063442) how does commercialization and technology influence popular culture, american security insurance company customer service phone number, is a plainfin midshipman a secondary consumer,

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