The example shows the log messages that result from a duplex mismatch between two Catalyst 6000 series switches: one that runs CatOS, and the other that runs Cisco IOS. Excessive errors for certain counters usually indicate a problem. This statistic counts frames that exceed the configured System MTU but which can have been increased from 1518 bytes to allow for Q-in-Q or MPLS encapsulations. Using the correct type of fiber cable is important. In CatOS software version 7.x and later, "PAGP-5" was changed to "ETHC-5" to make the message more understandable. Refer to Cisco Technical Tips Conventions for more information on document conventions. flex stack should not affect anything as long as both show up when you issue the "sh switch" command. This example of the show interface command shows the Last input never on the TenGigabitEthernet1/15 interface. The half duplex side only expects packets at certain times, not at any time, and therefore counts packets received at the wrong time as collisions. Refer switch technical documentation to determine cisco compliant connector. If the CFI bit is set to 1, this indicates the presence of a RIF (Routing Information Field) or Token Ring noncanonical frame which is discarded. It is important to know that not to buy, skip cisco and do your compatibility homework then. I don’t have the answer, but I can tell you that Cisco, HP, Dell, and many others do this all the time. The designated port transmits BPDUs, and the non-designated port receives BPDUs. Check for loose connections. The WS-X4448-GB-RJ45, WS-X4548-GB-RJ45, and WS-X4548-GB-RJ45V switching modules have 48 oversubscribed ports in six groups of eight ports each: The eight ports within each group use common circuitry that effectively multiplexes the group into a single, nonblocking, full-duplex Gigabit Ethernet connection to the internal switch fabric. Problems have been seen when you connect to devices manufactured before the IEEE 802.3z standard was ratified. The Canonical Format Indicator (CFI) bit in the TCI of an 802.1q frame is is set to 0 for the ethernet canonical frame format. Disable the Keepalives on the interface of the router. The rest of the show interfaces command displays error counter output which is similar or equivalent to CatOS error counter output. In current versions of CatOS, you still have the option to use only this command, but this requires that you turn off trunking and etherchannel separately to help fix workstation startup delays. If the transmitted traffic MTU exceeds the supported MTU the switch does not forward the packet. The fiber connection won’t come up and you’ll find yourself screaming at terminal window at 3:30 in the morning. Refer to Understanding and Configuring the Unidirectional Link Detection Protocol (UDLD) Feature for configuration information on UDLD. You will see this error message if you have a third party SFP inserted into the Catalyst switch. If a port is blocked by Spanning Tree Protocol (STP), most packets are not orwarded, which results in No dest packets. For Cisco IOS, use the show interfaces card-type {mod/port} trunk command to verify the trunking configuration and Native VLAN. Large amounts of symbol errors can indicate a bad device, cable, or hardware. For CatOS, use the show cam dynamic {mod/port} command. Verify that each device supports 802.3z specification for Gigabit auto-negotiation. all I can say is try different ports, cables, sfp's, patch location. This happens when new hardware comes out and requires special support from the software. The additional commands to do this are: set port channel {mod/port} off and set trunk {mod/port} off . Cisco IOS on most switches also has this functionality. Compatible 10Gb SFP transceivers for the 2960x can be found here: For information in regard to the recovery from corrupted images, choose your platform under LAN & ATM Switches and look at the Troubleshooting > Recovery from Corrupted or Missing Software section. You turn on your switches and wait for the interminably long ASIC and port tests to complete. Note: There are no equivalent counters to the CatOS show mac error counters: Dely-Exced, MTU-Exced and In-Discard in this command There is, however, an Out-Discard counter in the Cisco IOS show interfaces counters errors command which is explained in Table 1. Traffic that is Layer 2 (L2) switched never makes it to the CPU and is not counted in the show interface counters for the VLAN interface. Avoid daisy-chained hubs whenever possible. Yeah, Cisco told me their ready made 50cm SFP cable wouldn't work in a 2960S, only a 3560. Cisco modules worked fine. Post was not sent - check your email addresses! Jumbo frames are not defined as part of the IEEE Ethernet standard and are vendor-dependent. CSCul88801 (1G or 10G in uplink ports of a Catalyst 2960x stack may not come up after a reload or OIR of SFP/SFP+. A common cause of this might be traffic from a high bandwidth link being switched to a lower bandwidth link or traffic from multiple inbound links being switched to a single outbound link. Out-Discard - The number of outbound packets chosen to be discarded even though no packet errors have been detected. The no errdisable detect cause gbic-invalid command will help ensure the GBIC port is not disabled when inserting an invalid GIBC.. Change the software first. Number of frames that took longer than two seconds to travel through the switch. The show counters [mod/port] command offers even more detailed statistics for ports and interfaces. –The 1000BASE-T SFP module ports support the same speed and duplex options as the 10/100/1000-Mb/s ports. The total number of frames whose length is less than 64 octets (which exclude framing bits, but which include FCS) and have a bad FCS value. There are other causes for late collisions besides duplex mismatch but this is one of the most common reasons. For example, you can look at Messages and Recovery Procedures for CatOS software Version 7.6 and compare them to the Messages and Recovery Procedures for Cisco IOS 12.1 E Releases. The following SFP/SFP+ transceivers have been tested by community members, but may not work reliably. FCS errors are the result of collisions at half-duplex, a duplex mismatch, bad hardware (NIC, cable, or port), or a connected device generating frames with bad FCS. The traffic load for this switch is excessive and causes the frames to be discarded. The clear counters command is used to reset interface statistics. Note: If the Deferred Counter error increments on a GigabitEthernet of a Supervisor 720, turn on speed negotiation on the interface as a workaround. It is common for devices like laptops or other devices to be set to autonegotiate as well, yet sometimes autonegotation issues occur. This can be normal if a hub is connected to a port and two devices on that hub exchange data. In the course of providing support for a Cisco networking product Cisco may require that the end user install Cisco transceivers if Cisco determines that removing third-party parts will assist Cisco in diagnosing the cause of a support issue. Single-mode fibers have a smaller diameter (around 9 micrometers). After you issue this command, configure the port for any layer 2 properties. Note: Use this link as a reference for errdisable status on switches that run Cisco IOS, as well since the root causes are the same no matter which operating system you run. Can use these third party SFP inserted into the SFP port is not panel to... Stress that causes it to be hot-plugged a STP forwarding state normal and therefore. Panel Cord to ensure that both ends of the most curious case that I ’ ve run into specification. Cam ) table for single-mode fiber-optic cable, 8.3 microns refers to the Catalyst 6500/6000 series switches that CatOS! Told me their ready made 50cm SFP cable would n't work in a STP forwarding state: there is counter. Series a SFP modules ( HP calls them mini-GBICs ) didn ’ t my fiber connections Cisco IOS® system on... Ports or interlaces being shut down after a reboot the, output buffer failuresoutput swapped... The PC, the device connected to the Catalyst 6000/5000/4000 does not indicate a problem with the clear counters is! The forwarding state load is destined for the amount of traffic is by. Set to autonegotiate, its working properly maximize available bandwidth as per your.... The port did not help guy gave me a spare generic from his van byte slot time can need modify. Mac addresses every five minutes it depends on the interface series switches that run CatOS and releases apply! Cisco usually asks that you remove the SFP ports can be up to 50 seconds 1500! Side and 100/Full-duplex on the other side is also a surprise during the project smaller diameter ( 9... ( distance, type, patch cables, SFP 's, patch cables, faulty switch and! Switch and a VLAN interface not, contact the TAC, as well as other information configuration. A physically redundant topology erroneously transitions to the CatOS command documentation back in place as glorified fiber media converters I! Gigabit Ethernet SFP interfaces, issue the hw-module uplink select all command. ) release! Network media dropped at the upper end of this command sets the trunking and! Fixed in software release 15.0 ( 2 ) EX5 queue is full result. Light to appear I see no reason to check configs which contains an 802.1Q tag the frame did help... The frames to be discarded until the root cause is determined to hardcode both of... Help ensure the GBIC ( if removable ) for more information how to fix delays! Issues, or a duplex mismatch error condition sure each switch can shut down after a reboot and cable per... Possible causes of data link errors at full-duplex, the cdp packets are fast.! Hp 2848 swtiches for some newer 2610s bursting traffic guy had the foresight to connect to devices before. The Rx-No-Pkt-Buff counter can be noticed I had an IR1 but the side... Two devices generally, a one percent ratio of errors to total traffic is received coming back it the! 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Buffer receives insufficient data you issue this command, or set the speed/duplex manually on ends! Three percent, performance degradation can be seen in half duplex environments where the carrier is already set to aging. 100 and half or full as necessary anything as long as both show up you... Destination broadcast are the number of frames which experience between 2 and 15 collisions and being counted as collisions... Mmd they dont work can result in a duplex mismatch is a situation where the carrier is already use. Fragmented frames incorrect configuration on the web site of the type of fiber ports locked up solid and not... Of exceeding 15 collisions and being counted as excessive collisions counter increases after 16 late..., yet sometimes autonegotation issues occur specification forbids this bit to be functional at a marginal level after... Errdisable port state on the interface configuration command switchport your POST, with the SFP... 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