Generally, a one percent ratio of errors to total traffic is acceptable for half-duplex connections. Undersize = frame < 64bytes. SecureStatic Address Aging : Disabled. /Subtype /Link This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and 3750 series. In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. << /Subtype /Link Late collisions are a result of incorrect cabling or a non-compliant number of hubs in the network. For Cisco IOS, use theshow interfacescard-type {mod/port}trunkcommand to verify the trunking configuration and Native VLAN. 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. Switch#show inter status. When you look at show interfacecard-type {slot/port}statuscommand for Cisco IOS: Theshow loggingcommand for Cisco IOS also display the error messages (exact message format varies) that relate to the errdisable state. /Kids [42 0 R] /Parent 5 0 R 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. Changes aresavedto the config in Cisco IOS with the write memory command. The source and destination switches must belong to the same VLAN. Description:show interfaces. Share Improve this answer Follow answered May 19, 2016 at 14:08 Ron Maupin 97.5k 26 112 188 In half-duplex environments, it is possible for both the switch and the connected device to sense the wire and transmit at exactly the same time and result in a collision. /R [41 63 585 621] The collision frames counters are the number of times a packet was attempted to be transmitted but was not successful but was successful on its next attempt. 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 example, on a Catalyst2948G series switch, the 24Fast Ethernet ports belong logically to module 2. /contentType () Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in theshow interfacecounters for the VLAN interface. No destination multicast are the number of multicast packets that the port did not forward to any other ports. 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 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. FrameMaker 7.2 The Catalyst4912G, 2948G, and 2980G switches are fixed-configuration switches, but are logically modular. The show interfaces card-type {slot/port}command is the used command for Cisco IOS on the Supervisor to display error counters and statistics. Other possible causes of data link errors at full-duplex are bad cables, faulty switch ports, or NIC software/hardware issues. Other input-related errors can also cause the input errors count to be increased, and some datagrams can have more than one error. 01:03 AM A broken fiber cable or other cabling/port issues can cause this one-way only communication. The bottom line is that even if you configure the interface to recover from errdisable the problem reoccurs until the root cause is determined. 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. This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. The port moves to the STP forwarding state and creates a loop. 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. 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. Description:show interfacesand show interfaces counters errors. endobj 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]. %LINK-3-UPDOWN messages in the log show when the port status. SSH is supported for remote logins to the switch only. /Metadata 4 0 R 5 minute input/output rate - The average input and output rate seen by the interface in the last five minutes. Note: Some switches show a steady orange (amber) light on each port when this happens. Some workstations simply cannot wait this long to find their server and then they give up. endobj /Dest (G1060208) Each time we previously disconnected and reconnected the cable the port status just remained down/down. 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? This is only required if end-devices such as older Gigabit NICs are used which cannot support IEEE 802.3z. Normally, such a condition is temporary, dependent upon transient peak loads within the system. Description:show interfacescounter. >> For example, if a large amount of traffic flow comes in on a gigabit interface and is switched out to a 100Mbps interface, this can cause output drops to increment on the 100Mbps interface. An obvious but sometimes overlooked cause of port connectivity failure is an incorrect configuration on the switch. Check the IP address, subnet mask, default gateway, dynamic routing protocol configuration, static routes, and so on. If the source and destination belong to multiple VLANs and you specify MAC addresses, you can also specify a VLAN. Trunk links between a switch and a router can make the switchport go down. If you have device A connected to device B over a Gigabit link, and the link does not come up, perform this procedure. Unknown hostIf the host does not exist, an unknown host message is returned. 6 0 obj This example shows the source and destination MAC addresses specified, with no VLAN specified but with the detail option specified. MTU - The Maximum Transmission Unit (MTU) is 1500 bytes for Ethernet by default (for the max data portion of the frame). 17 0 obj Description:show interfaces counters errors. 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. 5 0 obj A switch is in down state when there is nothing connected to the port or if its admin shutdown. Someone else in the community shared this with me quite awhile back. In order to resolve this issue, Cisco has developed the PortFast feature for host ports. 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. 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. After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. The error message is received when the traffic level reaches about 2.5 Mb. 3506 Refer to Mode-Conditioning Patch Cord Installation Note for more information. Alignment errors are a count of the number of frames received that do not end with an even number of octets and have a bad Cyclic Redundancy Check (CRC).Common Causes:These are usually the result of a duplex mismatch or a physical problem (such as cabling, a bad port, or a bad NIC). 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. Excessive errors for certain counters usually indicate a problem. Violation Mode : Shutdown. Port on switch down/down (notconnect) - Cisco - The Spiceworks Community Description:show interfaces counters errors. Description:show interfacescounter indicates that the transmit jabber timer expired. The interface displays a lot of information including a visual representation of each port's status. IOS (tm) C2950 Software (C2950 . Follow the below . 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. /Subtype /Link The number of times the carrier was lost in transmission. Encryption commands are set crypto key rsa, clear crypto key rsa, and show crypto key. >> 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). /docType () 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 ensures that the MAC address table (the CAM table) contains the most recent entries. Destination unreachableIf the default gateway cannot reach the specified network, a destination unreachable message is returned. /Title (Checking Port Status and Connectivity) This article purportedly explains how to find the former, but actually explains how to find the latter. 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. But in full duplex environments the issue occurs when the excessive load is destined for the switch. 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. endobj This issue is resolved in Cisco IOS release 12.1(19)EA1 or 12.2(18)SE or later. Same behaviour when a PC wakes up from sleep. 12 0 obj This counter indicates the internal state of the Switching ASICs on the Supervisor and does not necessarily indicate an error condition. /Length 13 0 R sh ip protocols - all of the dynamic routing Change the cable and patch panel cord to ensure that the cable and patch cords are not defective. 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. Bad Port or Module Port or Interface or Module not enabled. For single-mode fiber-optic cable, 8.3 microns refers to the core diameter. To trace the path that packets take through the network, perform this task in privileged mode: Execute IP traceroute to trace the path packets take through the network. Description:show interfacescounter. Platform Exceptions:Catalyst Cat4000 Series that run Cisco IOSPrevious to software Version 12.1(19)EW, the giants counter incremented for a frame > 1518bytes. << The traffic load on the interface is excessive and causes the frames to be discarded. << Port status : Secure down help TechExams Community To support authentication for Telnet with secure shell encryption, use the telnet keyword in the set authentication commands. /Contents 29 0 R endobj No destination unicast are the number of unicast packets that the port did not forward to any other ports. /Dest (G1019856) /I 31 0 R Also, use a sniffer program to analyze packets that come in and out of the router fast Ethernet interface. /Rotate 0 This only happens under stress conditions but can happen with bursts of traffic on several ports. Description:sh interfacescounter. In its operation, STP relies on continuous reception or transmission of BPDUs based on the port role. Therefore, this sum cannot balance with the sum of enumerated input error counts. Collisions can cause runts, FCS, and alignment errors due to the frame notcompletely copied to the wire, which results in fragmented frames. To identify a Layer 2 path, perform one of these tasks in privileged mode: l2trace {src-mac-addr} {dest-mac-addr} [vlan] [detail]. CDP is Cisco proprietary and works when you send packets to a well-known MAC address 01-00-0C-CC-CC-CC. Find answers to your questions by entering keywords or phrases in the Search bar above. Note If you are using Kerberos to authenticate to the switch, you will not be able to use the secure shell encryption feature. It is usually easier to upgrade the software than it is to upgrade hardware. Refer to these documents for more information on the different trunking modes, guidelines, and restrictions: System Requirements to Implement Trunking. A switch is in down state when there is nothing connected to the port or if its admin shutdown. ', Switch#show dtp interfaceDTP information for FastEthernet1/0/1: TOS/TAS/TNS: ACCESS/AUTO/ACCESS TOT/TAT/TNT: UNKNOWN/NEGOTIATE/UNKNOWN Neighbor address 1: 000000000000 Neighbor address 2: 000000000000 Hello timer expiration (sec/state): never/STOPPED Access timer expiration (sec/state): never/STOPPED Negotiation timer expiration (sec/state): never/STOPPED Multidrop timer expiration (sec/state): never/STOPPED FSM state: S1:OFF # times multi & trunk 0 Enabled: no In STP: no, Statistics ---------- 0 packets received (0 good) 0 packets dropped 0 nonegotiate, 0 bad version, 0 domain mismatches, 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad TOT, 0 other 0 packets output (0 good) 0 native, 0 software encap isl, 0 isl hardware native 0 output errors 0 trunk timeouts 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, The "sh dtp interface" command shows the same date for all interfaces. Without attenuators, the minimum link distance is 24.9 miles (40 km). Dispersion-shifted single-mode fiber-optic cable. 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. Without the loop guard feature, the port assumes the designated port role. To identify the next hop, traceroute sends a UDP packet with a TTL value of 2. Port status as seen in the default dashboard color mode. An excessive collision happens when a packet has a collision 16 times in a row. << The first router decrements the TTL field by 1 and sends the datagram to the next router. This only happens under stress conditions but can happen with bursts of traffic on several ports. show counters interfaceshow controllers ethernet-controller. When the receive part (Rx) of the port has its Rx FIFO queue filled and reaches the high water mark, the transmit part (Tx) of the port starts to generate pause frames with an interval value mentioned in it. Description:show interfaces counters errors. The number of packets received incorrectly that has a CRC error and a non-integer number of octets (alignment error). The CDP packets are no longer recognized, and they are dropped. 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. 18 0 obj 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 Swap suspect cable with known good cable. The software version is also a factor. Acrobat Distiller 7.0 (Windows) /Parent 14 0 R /Rect [162 456.8999938965 320.8200073242 468.1199951172] A high number of CRCs is usually the result of collisions but can also indicate a physical issue (such as cabling, bad interface or NIC) or a duplex mismatch. /language (en) by /Rect [162 439.9200134277 349.799987793 451.1400146484] 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. A link light does not guarantee that the cable is fully functional. Full-duplex, 100Mb/s - Full-duplex and 100Mbps is the current speed and duplex setup of the interface. /Creator (FrameMaker 7.2) >> For fiber, make sure you have the correct cable for the distances involved and the type of fiber ports that are used. Warning: Disable auto-negotiation and this hides link drops or physical layer problems. The remote device is expected to stop / reduce the transmission of packets for the interval time mentioned in the pause frame. If this does not solve the issue, you need to consider a module without any oversubscription of ports. Thanks for this! CISCO MDS - Useful 'Show' Commands - DavidRing.ie /Subtype /XML 2023 Cisco and/or its affiliates. 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. If either device does not support Gigabit auto-negotiation, disable the Gigabit auto-negotiation, and it forces the link up.
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