i feel this command is only for trunks using DTP and not for access ports. If the link operates at full-duplex, the collision counter is not active. Trunk links between a switch and a router can make the switchport go down. connect.fm Bypass the media convertor if possible to rule it out. 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. If a port is blocked by Spanning Tree Protocol (STP), most packets are not orwarded, which results in No dest packets. This shows the last time a port sent or received traffic. endobj Does the port come up? In order to enable the simultaneous use of 10-Gigabit Ethernet and the Gigabit Ethernet SFP interfaces, issue thehw-module uplink select allcommand. ), 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 dribble bit error indicates that a frame is slightly too long.Common Causes:This frame error counter is incremented for informational purposes, since the switch accepts the frame. 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. 20 0 obj 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. /Rect [162 439.9200134277 349.799987793 451.1400146484] 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. 09-26-2014 As the half-duplex side transmits, the full duplex side does not wait its turn and transmits simultaneously which causes a late collision. /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] The number of times a collision occurred before the interface transmitted a frame to the media successfully.Common Causes:Collisions are normal for interfaces configured as half-duplex but must not be seen on full duplex interfaces. The flushes counter in the show interface command output increments as part of selective packet discard (SPD), which implements a selective packet drop policy on the IP process queue of the router. Five hundred and twelve bit-times corresponds to 51.2 microseconds on a 10 Mbit/s system. Refer toCisco Technical Tips Conventionsfor more information on document conventions. 25 0 obj Note: Variables that can affect routing (for example, load and reliability) are not cleared when the counters are cleared. For fiber, make sure you have the correct cable for the distances involved and the type of fiber ports that are used. << 11:42 AM Always ground the cables (especially in new cable runs) to a suitable and safe earth ground before you connect them to the module. It depends on the amount of the packets that are stored in the Rx FIFO buffer of the module ASIC. endobj An excessively loaded network can be caused by too many devices on a shared Ethernet. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Check the Cable and Both Sides of the Connection, Ethernet and Fast Ethernet Maximum Transmission Distances, Troubleshoot the Most Common Port and Interface Commands for Cisco IOS, Understand the Specific Port and Interface Counter Output for Cisco IOS, Show Controller Ethernet-Controller for Cisco IOS, %INTR_MGR-DFC1-3-INTR: Queueing Engine (Blackwater) [1]: FIC Fabric-A Received Unexpected Control Code, Command Rejected: [Interface] not a Switching Port, Port or Interface Status is Disable or Shutdown, Uplink Port or Interface Status is Inactive, Deferred Counter on the Catalyst Switch Interface Increments, Intermittent Failure to set timer [value] from vlan [vlan no], Use of Switchport Host to Fix Startup Delays, Speed/Duplex, auto-negotiation, or NIC Issues, Deferred Frames (Out-Lost or Out-Discard), Input Errors on a Layer 3 Interface Connected to a Layer 2 Switchport, Rapidly Increment Rx-No-Pkt-Buff Counter and Input Errors, Connectivity Issues due to Oversubscription, Last Input Never from the Output of Show interface Command, Mode-Conditioning Patch Cord Installation Note, Configuring and Troubleshooting Ethernet 10/100/1000 MB Half/Full Duplex Auto-Negotiation, Most Common Port and Interface Troubleshooting Commands for Cisco IOS, Recover Errdisable Port State on Cisco IOS Platforms, Understanding and Configuring VLAN Trunk Protocol (VTP), Configuring Jumbo/Giant Frame Support on Catalyst Switches, Using Portfast and Other Commands to Fix Workstation Startup Connectivity Delays, Troubleshooting Cisco Catalyst Switches to NIC Compatibility Issues, Spanning-Tree Protocol Enhancements using Loop Guard and BPDU Skew Detection Features, Understand and Configure the Unidirectional Link Detection Protocol (UDLD) Feature, Using PortFast and Other Commands to Fix Workstation Startup Connectivity Delays, Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation, Upgrade Software Images and Working with Configuration Files on Catalyst Switches, Technical Support & Documentation - Cisco Systems. 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. /Resources 30 0 R 21 0 obj /Rect [162 473.8800048828 315.8999938965 485.1600036621] Description:show interfaces counters errors. /P 6 0 R They can be defined as any frame bigger than the standard ethernet frame of 1518 bytes (which includes the L2 header and Cyclic Redundancy Check (CRC)). 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. The number of times the receiver hardware was unable to hand received data to a hardware buffer. FastEthernet0/0 is up, line protocol is up. In many cases, this is the result of a bad NIC. Description:show interfacescounter. The interaface also shows a UP/UP state. 5 0 obj endobj To identify the next hop, traceroute sends a UDP packet with a TTL value of 2. Port or Interface Status is Disable or Shutdown Port or Interface Status is errDisable Port or Interface Status is Inactive Uplink Port or Interface Status is Inactive Deferred Counter on the Catalyst Switch Interface Increments Intermittent Failure to set timer [value] from vlan [vlan no] Trunking Mode Mismatch Jumbos, Giants, and Baby Giants In privileged executive mode, the ping command allows you to specify the packet size, packet count, and the wait time. This is the command to use on the Catalyst 6000, 4000, 3550, 2950, and and 3750 series. Cisco Internetwork Operating System Software . Refer toUnderstand and Configure the Unidirectional Link Detection Protocol (UDLD) Featurefor configuration information on UDLD. These delays are caused by STP, trunking negotiations (DTP), and EtherChannel negotiations (PAgP). This does not tell you whether autoneg was used to achieve this. Thanks for this! >> 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 total number of frames which are filtered because of the type of VLAN information contained in the frame. Trunk can come up after you disable and enable the switchport, but eventually the switchport can go down again. The idea is that when a topology change occurs, this value is necessary to flush the CAM table faster, to compensate for the topology change. This is an indication of a bad frame generated by the connected device. Trunking changes the formatting of the packet. uuid:762af52f-ff85-490f-a0c3-36712e66e664 3#show ver . 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. It would be counted on theshow interfaceoutput for the appropriate physical interface. Hardcode both ends of the link to full duplex so that the negotiation mismatch can be avoided. 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. The line protocol up message shows the data link layer status of the interface and says that the interface can send and receive keepalives. The SSH feature provides security for Telnet sessions to the switch. >> << 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. Use theshow interfaces counters errorcommand to look at OutDiscards. This command displays the current configuration file of the switch. << Baby Giant frames are just slightly larger than the maximum size of an ethernet frame. 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). If a router finds a TTL value of 1 or 0, it drops the datagram and sends back an Internet Control Message Protocol (ICMP) time-exceeded message to the sender. /I 31 0 R Description:show interfacescounter. This issue is resolved in Cisco IOS release 12.1(19)EA1 or 12.2(18)SE or later. This tests each device and verifies that the Gigabit interface functions correctly. As an example, consider a scenario where a 1gig multicast stream is forwarded to 24 100 Mbps ports. CDP is Cisco proprietary and works when you send packets to a well-known MAC address 01-00-0C-CC-CC-CC. 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. 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.
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