Look at the "sh interface <BLAH>" and "sh controll e <BLAH>" any any line errors. For more information, see the "Checking Module Status" section. Encryption commands are set crypto key rsa, clear crypto key rsa, and show crypto key. Refer toCisco Technical Tips Conventionsfor more information on document conventions. Support for jumbo and baby giants on Catalyst switches varies by switch platform, sometimes even by modules within the switch. /Count 23 You can need to modify your network topology to reduce the traffic load for this switch. The traffic load destined for this switch is excessive and causes the frames to be discarded. When you operate at full-duplex, errors in FCS, Cyclic Redundancy Checks (CRC), alignment, and runt counters must be minimal. << The two options are single mode fiber (SMF) or multimode fiber (MMF). You can move the device that hangs off this port to faster media. Note: If the output of theshow interface switchportcommand displays the port as a trunk port even after you configure the port as an access port with theswitchport access vlancommand, issue theswitchport mode accesscommand in order to make the port an access port. 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. Change the software first. When you operate at half-duplex setup, some data link errors incrementin Frame Check Sequence (FCS), alignment, runts, and collision counters are normal. The traceroute command uses the Time To Live (TTL) field in the IP header to cause routers and servers to generate specific return messages. The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). This can be caused by a duplex mismatch and physical problems, such as a bad cable, port, or NIC on the attached device. << Make congestion avoidance a priority on your network. Most switches have some way to track the packets and errors that occur on a port or interface. This enables the remote device to start to transmit packets. 4. This means that if the 2 collision frames counter incremented, the switch attempted to send the packet twice and failed but was successful on its third attempt. Undersize = frame < 64bytes. 12 0 obj The issue occurs when an excessive amount of traffic is processed by the Fast Ethernet interface. A count of frames for which transmission on a particular interface fails due to excessive collisions. Use these resources to familiarize yourself with the community: Customers Also Viewed These Support Documents. This shows the number of hours, minutes, and seconds since the last packet was successfully received by an interface and processed locally on the router. Note: If the Deferred Counter error increments on a GigabitEthernet of a Supervisor 720, turn on speed negotiation on the interface as a workaround. Cisco Internetwork Operating System Software . /Dest (G1020163) 26 0 R] The number of received packets discarded because there is no buffer space.Common Causes:Compare with ignored count. Giant frames or frames received that exceed the maximum IEEE 802.3 frame size (1518 bytes for non-jumbo Ethernet) and have a bad Frame Check Sequence (FCS). To identify the next hop, traceroute sends a UDP packet with a TTL value of 2. Check the IP address, subnet mask, default gateway, dynamic routing protocol configuration, static routes, and so on. So, a small number of No buffers frames is not a cause for concern. /T 7 0 R In its operation, STP relies on continuous reception or transmission of BPDUs based on the port role. The | include connected shows only the lines of the output that contain the word "connected". endobj It also occurs when the hardware hits an oversubscription. This example shows the source and destination MAC addresses specified, with no VLAN specified but with the detail option specified. The maximum number of hops an l2trace query will try is 10; this includes hops involved in source tracing. Make sure your L3 addressing on the end device and on the router/ L3 switch is correctly configured. Description:show interfacescounter. 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). If either device does not support Gigabit auto-negotiation, disable the Gigabit auto-negotiation, and it forces the link up. 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 . To display the active user sessions on the switch, perform this task in privileged mode: Display the currently active user sessions on the switch. Acrobat Distiller 7.0 (Windows) endobj If the segment is shared, other devices on this segment can transmit so much that the switch has no opportunity to transmit. In many cases, this is the result of a bad NIC. The rcv-err counter on a 5K only increments as a result of excessive traffic. The Rx-No-Pkt-Buff counter can increase on ports when it has blades, such as WS-X4448-GB-RJ45, WS-X4548-GB-RJ45, and WS-X4548-GB-RJ45V. This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. These are brief descriptions of when the No dest, (unicast, multicast, and broadcast) counters can increment: If a port is an access port, and the port is connected to an Inter-Switch Link Protocol (ISL) trunk port, the No dest counter is very large since all inbound ISL packets are not forwarded. /Annots [16 0 R 17 0 R 18 0 R 19 0 R 20 0 R 21 0 R 22 0 R 23 0 R 24 0 R 25 0 R 10 0 obj /P 6 0 R Also, if there is a hub connected to the port, collisions between other devices on the hub can cause these errors.Platform Exceptions:Alignment errors are not counted on the Catalyst 4000 Series Supervisor I (WS-X4012) or Supervisor II (WS-X4013). For example, a runt, giant, or an FCS-Err does not increment the rcv-err counter. /Kids [54 0 R 55 0 R 56 0 R 57 0 R] Without the loop guard feature, the port assumes the designated port role. /Subtype /Link /Parent 3 0 R 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. Switches can participate as the source or destination of the traceroute command but will not appear as a hop in the traceroute command output. Unknown hostIf the host does not exist, an unknown host message is returned. A fragment is a frame < 64 bytes but with a bad CRC. Number of packets received by the port from the network, where the packets were more than 1514 bytes. 2011-03-17T11:53:32Z In normal executive mode, the ping command supports the -s parameter, which allows you to specify the packet size and packet count. Refer to theCatalyst Switch Cable Guide. (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? You must enable CDP on all of the Catalyst 4000 family, Catalyst 5000 family, and Catalyst 6500 series switches in the network. 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. Unplug the cable and reinsert it. Output queue - The number of packets in the output queue. The number of times multiple collisions occurred before the interface transmitted a frame to the media successfully. Description:show interfaces counters errors. This difference in detection time is based on the IEEE standards. >> Likewise, the Last input never, output never, output hang never status means the port is not in use. 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. The command output displays all network layer (Layer3) devices, such as routers, that the traffic passes through on the way to the destination. A single broken wire or one shutdown port can cause the problem where one side has a link light, but the other side does not. By default, software processes inside the switch can shut down a port or interface if certain errors are detected. If the link operates at full-duplex, the collision counter is not active. This can lead to slow throughput of packets across the device. Make sure that both ends of the cable are plugged into the correct ports. >> Last clearing of"show interface" counters - The last time the clear counters command was issued since the last time the switch was rebooted. 0 Helpful Share Reply johnlloyd_13 Engager Options 09-27-2014 02:01 AM Hi, Cisco IOS Software Release 12.2(25)SG supports the simultaneous use of 10-Gigabit Ethernet and the Gigabit Ethernet SFP interfaces on Catalyst 4500 switches. /iaPath ()
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