An SX GBIC does not link with an LX GBIC. This example shows you how to display the port capabilities for ports on module 2: This example shows you how to display the port capabilities for port 5 on module 3: You can access the switch CLI using Telnet. Trunking changes the formatting of the packet. Normally, such a condition is temporary, dependent upon transient peak loads within the system. 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. It would be counted on theshow interfaceoutput for the appropriate physical interface. 11:42 AM This process continues until the TTL is incremented to a value large enough for the datagram to reach the destination host (or until the maximum TTL is reached). endobj endobj /Dest (G1019941) The port starts to drop the packets when the Tx buffer is full and thus increases the underruns and the output buffer failure counters. The resolution is that ordinarily the system recovers automatically. Port status up and down and up again - Cisco The software version is also a factor. /Kids [6 0 R 45 0 R 46 0 R 47 0 R 48 0 R 49 0 R 50 0 R 51 0 R 52 0 R 53 0 R] Description:show interfacescounter. After 12.1(19EW, a runt = a fragment. The two devices that cause the late collision never see that each sends until after it puts the entire packet on the network. (See "Configuring CDP," for information about enabling CDP.) The issue occurs when an excessive amount of traffic is processed by the Fast Ethernet interface. /Names 2 0 R endobj In normal executive mode, the ping command supports the -s parameter, which allows you to specify the packet size and packet count. 3 0 obj Jumbo frames are not defined as part of the IEEE Ethernet standard and are vendor-dependent. This example shows how to ping a remote host from normal executive mode: This example shows how to ping a remote host using the -s option: This example shows how to enter a ping command in privileged mode specifying the number of packets, the packet size, and the timeout period: The Layer 2 Traceroute utility allows you to identify the physical path that a packet takes from a source to a destination. /Subtype /Link Common Causes:This is usually the result of collisions or a physical problem (such as cabling, bad port or NIC) but can also indicate a duplex mismatch. /country (US) 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. << Output queue - The number of packets in the output queue. If so, the port is good. Port status : Secure down help TechExams Community show interface status - Cisco /Border [0 0 0] Use thespeedandduplexcommands from interface configuration mode to hardcode both sides to 10 or 100 and half or full as necessary. Dispersion-shifted single-mode fiber-optic cable. The messages are generated by the switch. Note:Some port LEDs of the platform work differently in regard to STP. After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. /Rect [162 354.8999938965 288.1799926758 366.1199951172] A common cause is 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. >> output buffer failures output buffers swapped out. /accessLevel (Guest,Customer,Partner) 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. << the NIC cards in your machines going to sleep because of inactivity. Bad or wrong Gigabit Interface Convertor (GBIC). /Dest (G1024221) Connections for transmit-to-transmit and receive-to-receive do not work. The traffic load for this switch is excessive and causes the frames to be discarded. >> The information in this document was created from the devices in a specific lab environment. Description:show interfacescounter. 04:20 PM. 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. /Subtype /XML Eventually, the block port from the alternate or backup port becomes designated and moves to a forwarding state. << Change the cable and patch panel cord to ensure that the cable and patch cords are not defective. Typically, the output drops can occur if QoS is configured and does not provideenough bandwidth to certain class of packets. MTU - The Maximum Transmission Unit (MTU) is 1500 bytes for Ethernet by default (for the max data portion of the frame). This is because the switch does not know that the connected device is a PC; the switch only knows that the port has changed the state. 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? Always check the cable for marginal damage or failure. CISCO MDS - Useful 'Show' Commands CONFIG: show startup-config show running-config show running-config diff show run |include host|gateway|ntp|fcdomain|http|telnet|zoneset|vsan show start |include host|gateway|ntp|fcdomain|http|telnet|zoneset|vsan show install all status show switchname show wwn switch show switch summary show version Description:show interfaces counters errors. Basically, up/down means the port is available for a cable/connection, but doesn't have one. 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. No destination unicast are the number of unicast packets that the port did not forward to any other ports. Look at your logs (if link state logging is enabled) for signs of the interface going down/up. Use theshow interfaces statuscommand to display speed and duplex setup as well as other information. A key size with a larger number provides higher security but takes longer to generate. 5 minute input/output rate - The average input and output rate seen by the interface in the last five minutes. Common Causes:Excessive collisions are typically an indication that the load on the segment needs to be split across multiple segments but can also point to a duplex mismatch with the attached device. /Dest (G1029178) The rcv-err counter on a 5K only increments as a result of excessive traffic. Description:show interfacescounter. connect.fm This error message is caused when a frame is transmitted, and the local buffer of the controller chip local buffer receives insufficient data. 24 0 obj To identify the next hop, traceroute sends a UDP packet with a TTL value of 2. If you load a newer software version, it can often fix this. 17 0 obj If you're seeing up / down, the most likely causes are: Cable fault Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down) is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? >> Reduce the switch load if thenumber of packets in this field increase. - edited << 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. Some workstations simply cannot wait this long to find their server and then they give up. If collisions increase dramatically, this points to a highly utilized link or possibly a duplex mismatch with the attached device. The number of times multiple collisions occurred before the interface transmitted a frame to the media successfully. 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. The same output show up for trunk ports as well as access ports. The alternative is to contact the vendor for software/hardware upgrade for IEEE 802.3z Gigabit auto-negotiation support. Switches can participate as the source or destination of the traceroute command but will not appear as a hop in the traceroute command output. The show interface command displays the administrative and operational status of a switchport, input and output packets, buffer failures, errors, and so on. /Parent 3 0 R If the mismatch occurs between two Cisco devices with the Cisco Discovery Protocol (CDP) enabled, you see the CDP error messages on the console or in the logging buffer of both devices. Trace a Layer 2 path using IPaddresses or IP aliases. By default, Catalyst switch ports and interfaces are set to autonegotiate. /Dest (G1063442) /Border [0 0 0] Ping will return one of the following responses: Normal responseThe normal response (hostname is alive) occurs in 1 to 10 seconds, depending on network traffic. 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. << Refer toTroubleshooting Cisco Catalyst Switches to NIC Compatibility Issuesfor details on how to resolve third-party NIC issues. Check the port status on both sides. 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. 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). 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. stream
In order to overcome this situation, manually configure the speed and duplex, as well as disable the flow control, if required. /Subtype /Link In addition, these packets are not reported in the appropriate category (unicast, multicast, or broadcast) in receive statistics. If the port is a secure port, packets with disallowed source MAC addresses are not forwarded and increment the counter. The total number of frames which experience exactly one collision and are then successfully transmitted. The total number of frames which are filtered because of the type of VLAN information contained in the frame. endobj No action is required. That's how they behave. Cisco Internetwork Operating System Software . The excessive collisions counter increases after 16 consecutive late collisions have occurred in a row. /Author (ctsadmin-p.gen) 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. This table shows the most common commands used to troubleshoot the port or interface problems on switches that run Cisco IOS System Software on the Supervisor. Release Notes for the Cisco Catalyst IR1101 Rugged Series Router This message indicates to the traceroute facility that it has reached the destination. /iaPath () Late collisions can also indicate an Ethernet cable or segment that is too long. 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. Verify that there is not a faulty cable. If you have checked or tried the other suggestions in this document (checked speed/duplex, no physical errors on the link, all the traffic is normal valid traffic, and so on), then reducethe unit size that is sent by the application which can help to alleviate this problem. /Type /Pages Disable theKeepaliveson the interface of the router. R2#show inter fa 0/0. Destination does not respondIf the host does not respond, a no answer message is returned. 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. /Dest (G1020140) This indicates that a corruption of the packet occurred within transfer, and Blackwater received the corrupted packet. Use these resources to familiarize yourself with the community: Customers Also Viewed These Support Documents. Failures of any test of a module or port show an 'F' in the test results. Thanks for this! The Rx-No-Pkt-Buff does not depend on the total traffic rate. 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. Theshow counters interfacecommand was introduced in software version 12.1(13)E for the Catalyst 6000 series only anddisplays 32-bit and 64-bit error counters. If your network is live, ensure that you understand the potential impact of any command. To support authentication for Telnet with secure shell encryption, use the telnet keyword in the set authentication commands. 1000BASE-T and 1000BASE-X Port Cabling Specifications, Category 5 UTP Category 5e UTP Category 6 UTP, 722 ft (220 m) 902 ft (275 m) 1640 ft (500 m) 1804 ft (550 m), 1804 ft (550 m) 1804 ft (550 m) 1804 ft (550 m) 6.2 miles (10 km). The packet is then dropped. Reduce the traffic load on the interface if there are incrementsin the number of packets in this field. Find answers to your questions by entering keywords or phrases in the Search bar above. /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] Port status as seen in the default dashboard color mode. The 300msec default debounce timer comes from the firmware polling timer to the linecards, which occurs every 300 msec. 23 0 obj 01:03 AM 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. Check the physical connection on both sides. 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. /date (2007-05-04T15:24:40.000-07:00) As the half-duplex side transmits, the full duplex side does not wait its turn and transmits simultaneously which causes a late collision. >> An excessively loaded network can be caused by too many devices on a shared Ethernet. /language (en) Enter both the module number and the port number to see detailed information about the specified port. Refer to Mode-Conditioning Patch Cord Installation Note for more information. %PDF-1.4 Frames that increment at the upper end of this counter can exceedthe 15 collisions and can becounted as Excessive collisions. 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 Catalyst enterprise LAN switches are multimodule systems. Cisco: All about errdisable (and how to enable ports disabled by it) The frames received that are smaller than the minimum IEEE 802.3 frame size (64 bytes for Ethernet), and with a bad CRC.Common Causes:This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device.Platform Exceptions:Catalyst 4000 Series that run Cisco IOSPrevious to software Version 12.1(19)EW, a runt = undersize. This example shows how to check module status on a Catalyst2948G switch: This example shows how to check module status on a specific module: You can display summary or detailed information on the switch ports using the show port command. To identify a Layer 2 path, perform one of these tasks in privileged mode: l2trace {src-mac-addr} {dest-mac-addr} [vlan] [detail]. 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. Always ground the cables (especially in new cable runs) to a suitable and safe earth ground before you connect them to the module. For more information, see the "Checking Module Status" section. /Subtype /Link The loop guard feature makes additional checks. Unplug the cable and reinsert it. Refer toUnderstand and Configure the Unidirectional Link Detection Protocol (UDLD) Featurefor configuration information on UDLD. 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. 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. /Metadata 4 0 R In SPA modules, after you create a sub interface with 802.1Q, the same VLAN is not usable on the switch. Always set both sides of the connection to auto-negotiate speed/duplex or set the speed/duplex manually on both sides. Move the cable to a known good port to troubleshoot a suspect port or module. show counters interfaceshow controllers ethernet-controller. If you connect a good cable to two switch ports in the notconnect state, the link light must become green for both ports, and the port status must indicate connected. 16 0 obj These delays are caused by STP, trunking negotiations (DTP), and EtherChannel negotiations (PAgP). Each time we previously disconnected and reconnected the cable the port status just remained down/down. /Resources 30 0 R 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. 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. /Type /Page Full-duplex, 100Mb/s - Full-duplex and 100Mbps is the current speed and duplex setup of the interface. (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 can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device. 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. For general configuration information and additional information on how to troubleshoot, refer to Configuring and Troubleshooting Ethernet 10/100/1000 MB Half/Full Duplex Auto-Negotiation . Description:show interfacescounter. If a port has a solid orange light, this means the software inside the switch shut down the port, either by way of the user interface or by internal processes. Refer to Mode-Conditioning Patch Cord Installation Note for more information. /ModDate (D:20110317115332Z) Make sure your L3 addressing on the end device and on the router/ L3 switch is correctly configured. Try the cable in another port or interface if one is available and see if the problem continues. You can upgrade10Mbps links to 100Mbps or Gigabit Ethernet links when possible. switch# show vtp status VTP Version : 1 Configuration Revision : 0 . If any devices in the path are transparent to CDP, l2trace will not be able to trace the Layer 2 path through those devices. You must either enable or disable link negotiation on both ends of the link. The total number of frames which experience between 2 and 15 collisions, inclusive, and are then successfully transmitted. The show interfaces status cli command shows you all interfaces. The input rate of traffic exceeded the ability of the receiver to handle the data. This can occur when interfaces are configured as layer 2 switchports that use theswitchportcommand. /Border [0 0 0] An STP loop is created when an STP block port in a redundant topology erroneously transitions to the forwarding state. 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. For example, on a Catalyst2948G series switch, the 24Fast Ethernet ports belong logically to module 2. 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. This can be an indication of faulty hardware, dot1q or ISL trunking configuration issues. 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. How to find the port Uptime/Downtime status or utilization in - Cisco FCS error count is the number of frames that were received with a bad checksum (CRC value) in the Ethernet frame. . << This example of theshow run interfacecommand shows the unknown protocol drops on the GigabitEthernet 0/1 interface. A unidirectional link is a link where traffic goes out one way, but no traffic is received in the ingress direction. endobj The port can be configured to filter 802.1Q tagged frames. The Pluggable Module provides the flexibility of adding different interfaces to the IR1101 platform, for example, a cellular module. Table20-1 lists the default values that apply to the ping-s command. When a port receives a Symbol, it extracts the 8 bit data from the Symbol (10 bits). This kind of source routing is only defined for Token Ring and FDDI. The WS-X4448-GB-RJ45, WS-X4548-GB-RJ45, and WS-X4548-GB-RJ45V switching modules have 48 oversubscribed ports in six groups of eight ports each: The eight ports within each group use common circuitry that effectively multiplexes the group into a single, non-block, full-duplex Gigabit Ethernet connection to the internal switch fabric. This example shows how to set the logout timer value to 10 minutes: This example shows how to set the logout timer value to 0, preventing idle sessions from being disconnected automatically: Note To use the secure shell encryption (SSH) feature commands, you must be running an encryption image. New here? Set the duplex to full-duplex. It also occurs when the hardware hits an oversubscription. Because of this, a chance exists for the device connected to the catalyst switch to drop packets. When a frame is received which contains an 802.1Q tag the frame is filtered and this statistic is incremented. In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. Number of packets received by the port from the network, where the packets were more than 1514 bytes. 3#show ver . 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. Description:show interfaces counters errors. When a layer 3 interface is connected to a layer 2 switchport, it is not able to interpret these frames, which results in Input errors, WrongEncap errors, and Input queue drops. In this case, an orange light can indicate the normal functions of the STP. This table shows an example of the commands used to configure verify and troubleshoot the errdisable status on switches. If single connection or Step 3 fails with SC connectors, loop the port back to itself (port one RX goes to port one TX). The Maximum Transmission Unit (MTU) of the data portion of an ethernet frame is 1500 bytes by default. In order to enable the simultaneous use of 10-Gigabit Ethernet and the Gigabit Ethernet SFP interfaces, issue thehw-module uplink select allcommand. /Type /Pages 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. 1 Answer Sorted by: 4 From configuration mode, type logging monitor info end then from enable mode type term [inal] mon [itor] this will send console messages to your vty session. Common Causes:This is typically a physical issue (such as cabling, a bad port, or a bad Network Interface Card (NIC)) but can also indicate a duplex mismatch. 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 "Port Status" in the output of "show port-security" - Cisco When you add the VLAN back into the VLAN table from a VTP server switch, the ports of the switches in the domain that belong to that restored VLAN become active again. If that VLAN is deleted, then the port or interface becomes inactive. THis is the first "up" in your "up/down" issue. Bypass the patch panel if possible to rule it out. ^ %-V5V'}ho0&qctqW
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{[#-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 If you have a large number of deferred frames, or Out-Discard (also referred to as Out-Lost on some platforms), it means that the switch output buffers have filled up and the switch had to drop these packets. The controller senses the wire and checks if it is not busy before it transmits.Common Causes:This is normal on an half-duplex Ethernet segment. Changes aresavedto the config in Cisco IOS with the write memory command. The Carri-Sen (carrier sense) counter increments every time an Ethernet controller wants to send data on a half-duplex connection. Issue theshow cam agingcommand to check the CAM aging time on the switch. This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. You can use IP traceroute to identify the path that packets take through the network on a hop-by-hop basis. Text >> 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 9 0 obj 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. Reduce the switch load if thenumber of packets in this field increase.
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