cisco show port status up down

To apply configuration commands to a particular port, you must specify the appropriate logical module. >> Use theshow run interfacecommand and check to see if the interface is in ashutdownstate: If the port goes into shutdown mode immediately after a reboot of the switch, the probable cause is the port security setup. THis is the first "up" in your "up/down" issue. Wheb ports or interlaces are shut down as a result of errdisable are referred to as causes in Cisco IOS. Giant frames are defined as any frame over the maximum size of an ethernet frame (larger than 1518 bytes) that has a bad FCS. Your network can send too many packets through this port for the port to handle at its current speed/duplex setup. Description:show interfacescounter. If you have device A connected to device B over a Gigabit link, and the link does not come up, perform this procedure. When you operate at full-duplex, errors in FCS, Cyclic Redundancy Checks (CRC), alignment, and runt counters must be minimal. Using Secure Shell Encryption for Telnet Sessions. << The traffic load on the interface is excessive and causes the frames to be discarded. 06-22-2009 Swap suspect GBIC with known good GBIC. Reconfigure the trunk encapsulation on both devices. 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. Share Description:show interfaces counters errors. If the source and destination belong to multiple VLANs and you specify MAC addresses, you can also specify a VLAN. 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. 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. FrameMaker 7.2 There are other causes for late collisions besides duplex mismatch, but this is one of the most common reasons. 26 0 obj 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. 2 0 obj This high load of traffic oversubscribes the ports, which exhausts the input buffers and causes the Rx-No-Pkt-Buff counter and input errors to increase rapidly. The Catalyst 6000/4000 does not turn the port light orange when it blocks for STP. Make sure the ports on the devices that are connected together are both SMF, or both are MMF ports. Note: Refer toUsing Portfast and Other Commands to Fix Workstation Startup Connectivity Delaysfor more information how to fix startup delays. So, a small number of No buffers frames is not a cause for concern. Description:show interfaces counters errors. Changes aresavedto the config in Cisco IOS with the write memory command. If Rx-No-Pkt-Buff is zero or does not increment and the TxPauseFrames counter increments, it indicates that our switch generates pause frames and the remote end obeys, hence Rx FIFO queue depletes. The show interface command displays the administrative and operational status of a switchport, input and output packets, buffer failures, errors, and so on. 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. After 12.1(19EW, a runt = a fragment. /Last 44 0 R When a port receives a Symbol, it extracts the 8 bit data from the Symbol (10 bits). If a port or module is manually shut down on one side of the link or the other, the link does not come up until you re-enable the port. << . You can see what modules are installed, as well as the MAC address ranges and version numbers for each module, by using the show module command. endobj If the Rx is able to clear the Rx queue or reach low water mark within this interval, Tx sends out a special pause frame that mentions the interval as zero (0x0). A key size with a larger number provides higher security but takes longer to generate. A link light does not guarantee that the cable is fully functional. For more information about how to troubleshoot hardware problems with theshow modulecommand, see the Port or Interface Status is disabled or shutdown or the Hardware Problems sections of this document. /ModDate (D:20110317115332Z) 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. The two options are single mode fiber (SMF) or multimode fiber (MMF). 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. Small amounts of symbol errors can be ignored. /Names 2 0 R /Nums [0 32 0 R] Cisco ethernet interfaces are normally down / down if they don't have a link. Checking Port Status and Connectivity Download this chapter Checking Port Status and Connectivity Download the complete book Catalyst 4500 Series, Catalyst 2948G and Catalyst 2980G Switches Software Configuration Guide, 7.5 ( PDF - 6 MB) Feedback Table Of Contents Checking Port Status and Connectivity Checking Module Status Checking Port Status After you issue this command, configure the port for any layer 2 properties. You can use IP traceroute to identify the path that packets take through the network on a hop-by-hop basis. >> The traffic load destined for this switch is excessive and causes the frames to be discarded. This commanda display the 32-bit and 64-bit error counters per port or interface. endobj The common commands used to find this type of information are described in the Most Common Port and Interface Troubleshooting Commands for Cisco IOS section of this document. If not, contact the TAC, as this can be a faulty port. The number of received packets ignored by the interface because the interface hardware ran low on internal buffers. Bypass the patch panel if possible to rule it out. /accessLevel (Guest,Customer,Partner) 2023 Cisco and/or its affiliates. Common Causes:Check for a bad cable. For a single interface.Cisco-Switch#show int g1/0/7 Last input never, output 1y25w, output hang never, For all interfaces.Cisco-Switch#show int | in Last | proto, I think this command will give u the uptime of that interface. Description:show interfaces counters errors. That's how they behave. This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device. << Normally you can identify this situation if the port has many packet errors, or the port constantly flaps (loses and regains link). /Dest (G1019856) 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. 29 0 obj switch# show vtp status VTP Version : 1 Configuration Revision : 0 . Some workstations simply cannot wait this long to find their server and then they give up. This increments when the CRC generated by theLAN station or far-end device that originates the traffic does not match the checksum calculated from the data received.Common Causes:This usually indicates noise or transmission problems on the LAN interface or the LAN itself. 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. Refer toUnderstanding and Configuring VLAN Trunk Protocol (VTP)for more information on VTP. The error message is received when the traffic level reaches about 2.5 Mb. Verify the cable selection. Typically this means frames up to 1600 bytes in size. Status is whether or not the interface is enabled administratively or if there is a physical connection to another device on the other end. << Bad Port or Module Port or Interface or Module not enabled. Reduce the traffic load on the interface if there are incrementsin the number of packets in this field. 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 /Count 10 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. 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. A fragment is a frame < 64 bytes but with a bad CRC. If a packet was received on port 0/1, with destination MAC address X, and the switch has already learned that MAC address X resides on port 0/1, it increments the counter and discards the packet. /Type /Annot For each Catalyst 4000 family, 5000 family, and 6500 series switch found in the path, the output shows the device type, device name, device IP address, in port name, in port speed, in port duplex mode, out port name, out port speed, and out port duplex mode. /Filter /FlateDecode This can happen in these situations: If a hub is connected to port 0/1, and a workstation connected to the hub transmits a packets to another workstation connected to the hub, port 0/1 does not forward this packet anywhere because the destination MAC resides on the same port. endobj Packet loss causes retransmissions at the transport layer which in turn causes users to experience latency at the application level. 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. It depends on the amount of the packets that are stored in the Rx FIFO buffer of the module ASIC. For troubleshoot information, see theDeferred Frames (Out-Lost or Out-Discard)section of this document. This area consists of the fiber core plus a small portion that covers the cladding. Note: Variables that can affect routing (for example, load and reliability) are not cleared when the counters are cleared. 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]. /Dest (G1029178) To support authentication for Telnet with secure shell encryption, use the telnet keyword in the set authentication commands. The most common reason for TCNs is client PCs connected directly to a switch. For more information, refer to the UDLD: One-Way link problems section of this document. This total includes frames of all destination types. /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] To determine when a datagram reaches its destination, traceroute sets the UDP destination port in the datagram to a very large value that the destination host is unlikely to be using. 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. The cable can have encountered physical stress that causes it to be functional at a marginal level. If the switch overwhelms the Ethernet interface, check the speed and duplex setup. Use theinterface-rangecommand to do this on multiple interfaces at once. << Unknown protocol dropsis a counter on the interface. Switch#show port-security interface fastEthernet 0/1 Port Security : Disabled.

William Tecumseh Sherman Grandchildren, Satisfactory Iron Factory Layout, Articles C