If not, contact the TAC, as this can be a faulty port. 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 << 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. This can occur when you manually hardcodethe speed and duplex or from auto-negotiation issues between the two devices. ', Switch#show dtp interfaceDTP information for FastEthernet1/0/1: TOS/TAS/TNS: ACCESS/AUTO/ACCESS TOT/TAT/TNT: UNKNOWN/NEGOTIATE/UNKNOWN Neighbor address 1: 000000000000 Neighbor address 2: 000000000000 Hello timer expiration (sec/state): never/STOPPED Access timer expiration (sec/state): never/STOPPED Negotiation timer expiration (sec/state): never/STOPPED Multidrop timer expiration (sec/state): never/STOPPED FSM state: S1:OFF # times multi & trunk 0 Enabled: no In STP: no, Statistics ---------- 0 packets received (0 good) 0 packets dropped 0 nonegotiate, 0 bad version, 0 domain mismatches, 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad TOT, 0 other 0 packets output (0 good) 0 native, 0 software encap isl, 0 isl hardware native 0 output errors 0 trunk timeouts 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, The "sh dtp interface" command shows the same date for all interfaces. Description:The number of outbound packets chosen to be discarded even though no errors have been detected.Common Causes:One possible reason to discard such a packet can be to free up buffer space. For fiber, make sure you have the correct cable for the distances involved and the type of fiber ports that are used. Description:show interfacescounter. endobj The Maximum Transmission Unit (MTU) of the data portion of an ethernet frame is 1500 bytes by default. You must apply configuration commands to the appropriate module. (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? Make congestion avoidance a priority on your network. Total output drops - The number of packets dropped because the output queue is full. 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 endobj Use thespeedandduplexcommands from interface configuration mode to hardcode both sides to 10 or 100 and half or full as necessary. The issue occurs when Encoded Address Recognition Logic (EARL) is unable to set the CAM aging time for the VLAN to the required number of seconds. 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. To use this feature, you must install the application on the client accessing the switch and you must configure SSH the switch. 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. If unicast flooding is enabled on that port, it can cause the port to shut down after a reboot. << >> Issue theshow cam agingcommand to check the CAM aging time on the switch. SPD is a mechanism that quickly drops low priority packets when the CPU is overloaded in order to savesome processcapacity for high priority packets. 8 0 obj Trunking changes the formatting of the packet. Use theclear counterscommand to zero the traffic and error counters so that you can see if the problem is only temporary, or if the counters continue to increment. This example of the show interface command shows theLast input neveron the TenGigabitEthernet1/15 interface. 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. 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. The clear counters command is used to reset interface statistics. To enable err-disabled ports on Cisco 3750 switch series. When a port is in error-disabled state, it is effectively shut down and no traffic is sent or received on that port. /Subtype /Link 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. This example of theshow run interfacecommand shows the unknown protocol drops on the GigabitEthernet 0/1 interface. 12 0 obj The ping command is configurable from normal executive and privileged executive mode. Note: To access tools and websites, you must be a registered Cisco client. The alternative is to contact the vendor for software/hardware upgrade for IEEE 802.3z Gigabit auto-negotiation support. 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. Frames that increment at the upper end of this counter can exceedthe 15 collisions and can becounted as Excessive collisions. The SSH feature provides security for Telnet sessions to the switch. Swap suspect GBIC with known good GBIC. The loop guard feature makes additional checks. /OpenAction [6 0 R /XYZ null null null] If the end device is on a different VLAN from where you try to ping, a L3 switch or router must be configured to allow the devices to communicate. >> /Type /Annot If so, the port is good. Here, the VLAN aging time is already set to fast aging. These random drops are called SPD flushes. Description:show interfaces counters errors. Encryption commands are set crypto key rsa, clear crypto key rsa, and show crypto key. << When you enable link negotiation, the system auto-negotiates flow control, duplex mode, and remote fault information. The CDP packets are no longer recognized, and they are dropped. Full-duplex, 100Mb/s - Full-duplex and 100Mbps is the current speed and duplex setup of the interface. In order to troubleshoot auto-negotiation problems it is often recommended to try and hardcodeboth sides. The bottom line is that even if you configure the interface to recover from errdisable the problem reoccurs until the root cause is determined. 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. This kind of source routing is only defined for Token Ring and FDDI. 2023 Cisco and/or its affiliates. Learn more about how Cisco is using Inclusive Language. This chapter consists of these major sections: Using Secure Shell Encryption for Telnet Sessions. This indicates that a corruption of the packet occurred within transfer, and Blackwater received the corrupted packet. Reduce the traffic load on the interface if there are incrementsin the number of packets in this field. /Type /Annot Telnet sessions initiated from the switch cannot be encrypted. /Rect [162 456.8999938965 320.8200073242 468.1199951172] 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 the frames received on any group exceeds the bandwidth of 1 Gbps, the device starts to drop the frames. endobj 27 0 obj SSH is supported for remote logins to the switch only. Some workstations simply cannot wait this long to find their server and then they give up. After 16 attempts have been made to send the packet the packet is dropped, and the counter increments. << 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. Collisions in a half-duplex environment are normal expected behavior. 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. /V 27 0 R For more information on software compatibility, use the Software Advisor tool. Verify the cable selection. ^ %-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 The size of this buffer is only 16 KB. /Filter /FlateDecode 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. Hardcode both ends of the link to full duplex so that the negotiation mismatch can be avoided. /Names 2 0 R Note:There is a difference between the counter of show interface command output for a physical interface and a VLAN interface.The input packet counters increment in the output ofshow interfacefor a VLAN interface when that packet is Layer 3 (L3) processed by the CPU. /P 6 0 R 28 0 obj These frames are dropped and not propagated onto other ports. In order to enable the simultaneous use of 10-Gigabit Ethernet and the Gigabit Ethernet SFP interfaces, issue thehw-module uplink select allcommand. The port starts to drop the packets when the Tx buffer is full and thus increases the underruns and the output buffer failure counters. Port status as seen in the default dashboard color mode. Resolution In order to check to see how long the port is in Up or Down status, use the show interfaces [interface id] command. This difference in detection time is based on the IEEE standards. Number of packets received by the port from the network, where the packets were more than 1514 bytes. 7 0 obj After you issue the command, re-boot the switch or else the output of theshow interface status modulecommand shows the uplink port as inactive. The input rate of traffic exceeded the ability of the receiver to handle the data. Note: PortFast also bypasses spanning-tree calculations on the port, and is therefore only suitable for use on a host port. 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). These types of errors increase rapidly, especially when the traffic that passes through that link is high or when it has devices such as servers connected to that interface. /Last 44 0 R (Protocol down/up). Broadcast storms can often be responsible for these events. You can use IP ping to test connectivity to remote hosts. An STP loop is created when an STP block port in a redundant topology erroneously transitions to the forwarding state. 22 0 obj 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. endobj /Dest (G1030299) NFS file transfers that come from a Gigabit attached server that uses user datagram protocol (UDP) with a 32K window size is one example of an application setup that can bring out this type of problem. Because of this, a chance exists for the device connected to the catalyst switch to drop packets. endobj 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. Displays Cisco Technical Support information about EtherChannels. After you issue this command, configure the port for any layer 2 properties. Check the physical connection on both sides. Gigabit Ethernet has an auto-negotiation procedure that is more extensive than the one used for 10/100 Ethernet (Gigabit auto-negotiation spec: IEEE Std 802.3z-1998). The switch will reflect that behaviour and you'll see a link go down/up two times. /CreationDate (D:19990615140519Z) The number of times the carrier was not present in the transmission.Common Causes:Check for a bad cable. This can occur when interfaces are configured as layer 2 switchports that use theswitchportcommand. It is common for devices like laptops or other devices to be set to autonegotiate as well, yet sometimes autonegotation issues occur. New here? Switch#show port-security interface fastEthernet 0/1 Port Security : Disabled. When you use either the WS-X6548-GE-TX or WS-X6148-GE-TX modules, there is a possibility that individual port utilization can lead to connectivity problems or packet loss on the surrounding interfaces. /Parent 3 0 R 1 0 obj Use theshow interfaces counters errorcommand to look at OutDiscards. If collisions increase dramatically, this points to a highly utilized link or possibly a duplex mismatch with the attached device. The | include connected shows only the lines of the output that contain the word "connected". Five hundred and twelve bit-times corresponds to 51.2 microseconds on a 10 Mbit/s system. Each time we previously disconnected and reconnected the cable the port status just remained down/down. If a packet cannot be completely received because the switch is out of packet buffers, this counter is incremented once for every dropped packet. Theshow interfacescard-type {slot/port}counterscommand is used when you run Cisco IOS on the Supervisor. Jumbo frames are not defined as part of the IEEE Ethernet standard and are vendor-dependent. All switches in the path must be reachable from each other. You can display the currently active user sessions on the switch using the show users command. 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. Every port on a Layer 3 switch configured to be a L2 switchport must also belong to a VLAN. Check the port status on both sides. As the half-duplex side transmits, the full duplex side does not wait its turn and transmits simultaneously which causes a late collision. /Kids [54 0 R 55 0 R 56 0 R 57 0 R] In order to resolve this, change the mode of the switch port tostatic accessortrunkas per your requirement. /Outlines 3 0 R Make sure the port or module has not been disabled or powered down for some reason. 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. 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. /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 command show diagnostic was introduced in 12.1(11b)E for the Catalyst 6000 series and show diagnostics (with an s ) was introduced in for Catalyst 4000 Series. 20 0 obj This can be an indication of faulty hardware, dot1q or ISL trunking configuration issues. In order to see POST results per module, use theshow diagnostics modulecommand. - last edited on /Parent 5 0 R Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in theshow interfacecounters for the VLAN interface. ctsadmin-p.gen Trace a Layer 2 path using IPaddresses or IP aliases. 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.
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