Port Name Status Vlan Duplex Speed Type . 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). The runt counter only incremented when a frame less than 64 bytes was received. In Cisco IOS, you can use theswitchport hostcommand to disable channeling and to enable spanning-tree portfast and theswitchport nonegotiatecommand to turn off DTP negotiation packets. If this counter increments, it is an indication of a wiring problem, an excessively loaded network, or a duplex mismatch. 22 0 obj /Type /Annot Troubleshoot Switch Port and Interface Problems - Cisco 2011-03-17T11:53:32Z Try the following commands. /Subtype /Link Common Causes: This error can indicate a duplex mismatch among other things. Therefore, it applies to only process switched traffic. 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. Status is whether or not the interface is enabled administratively or if there is a physical connection to another device on the other end. The total number of frames whose first transmission attempt was delayed, due to traffic on the network media. Description:show interfaces. ehxg!UD|_\\zAo*(EJu4Qa-NC-L%;1::Hr3j`39Xg35t!9 /Threads [7 0 R] See the Common Port and Interface Problems section of this document for more information. 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). /Subtype /Link OnCatalyst 4000 Seriesrcv-err = the sum of all receive errors, which means, in contrast to the Catalyst 5000, that the rcv-err counter increments when the interface receives an error like a runt, giant or FCS-Err. (It still must be far less than one percent of the frames received.). >> Run a port TDR to test the integrity of the copper cable. For more information on troubleshoot hardware related errors on Catalyst switches, see the Hardware Problems section of this document. For a 10 Mbit/s port this is later than 512 bit-times into the transmission of a packet. No destination broadcast are the number of broadcast packets that the port did not forward to any other ports. To enable SSH on the switch, perform this task in privileged mode: This example shows how to create the RSA host key: The nbits value specifies the RSA key size; the valid key size range is from 512 to 2048 bits. All of the devices used in this document started with a cleared (default) configuration. The | include connected shows only the lines of the output that contain the word "connected". When you power up or down the PC, the switch port changes state, and the switch starts the TCN process. The issue is because the traffic load destined for the switch is excessive and causes the frames to be discarded. 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. To use this feature, you must install the application on the client accessing the switch and you must configure SSH the switch. ^ %-V5V'}ho0&qctqW o1?W[|Z43lHLK {[#-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 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 Cisco command to show all available ports - The Spiceworks Community Check the cable, or other computer. This does not tell you whether autoneg was used to achieve this. 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. endobj Run a port TDR to test the integrity of the copper cable. New here? "Port Status" in the output of "show port-security" - Cisco 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). It also occurs when the hardware hits an oversubscription. The designated port transmits BPDUs, and the non-designated port receives BPDUs. Description:show interfacescounter. 10 0 obj This will give you the last upinformation. Bypass the patch panel if possible to rule it out. It has helped us a lot. 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. Cisco Catalyst IR1101 Rugged Series Router. Other possible causes of data link errors at full-duplex are bad cables, faulty switch ports, or NIC software/hardware issues. Monitorthese counters for increments as it is useful to determine whether traffic flows properly through the interface. If a port just acquired a link, there is a very brief (less than one second) period where inbound packets are not forwarded. INZA.@iQ/eY}`9@deB;r2.5I>/k^'`P(YTqSIuhBj6c/ 8jTw{%jQtP:@\c"xJ /iJ}#!s;Z7)z5A2AY+}qEVV"'W$Rd9}rol0)^}q{Fm>%,$N4A9$:[!\v;< @QOi"q8ITnV2abvyY;z2js^wB>_T m*wHQOWB-G`\ O;}ww ?PxWEs?\xKa[,bvZ,h"0.uB[bT\uOU|eL;HLQXdh8j>A . Find answers to your questions by entering keywords or phrases in the Search bar above. Fa0/1 connected 1 a-full a-100 10/100BaseTX . /Type /Annot Fast aging temporarily sets the CAM aging time to the number of seconds that the user specifies, and is used in conjunction with the Topology Change Notification (TCN) process. 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. endobj If neither auto-negotiation or hardcode setupseem to work, there can be a problem with the firmware or software on your NIC card. 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. The default CAM aging time is five minutes, which means that the switch flushes the table of learned MAC addresses every five minutes. The number of received packets ignored by the interface because the interface hardware ran low on internal buffers. In many cases, this is the result of a bad NIC. For example, if the port is 10 Mbps, move this device to a 100 Mbps or Gigabit port. When you have devices that need to carry a large amount of traffic through that interface, consider the use of one port of each group so that the common circuitry that shares a single group is not affected by this amount of traffic.

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