- #SHOW INTERFACE ERRORS SOFTWARE#
- #SHOW INTERFACE ERRORS SERIES#
Note: Cut-through switching can be performed only when the ingress data rate is equivalent to or faster than the egress data rate. Forwarding mode is dependent on the ingress and egress data rate, as shown in table 1. UCS Fabric Interconnects (similar to Nexus 5000) utilizes both cut-through and store-and-forward switching.
Received bad CRC “stomped” from neighboring cut-through switch.įorwarding Mode Behavior (Cut-Through or Store and Forward). Bad physical connection transceiver, copper, fiber, adapter, port expander, etc. Some of the reasons for getting bad frames and CRC errors can be: Refer to the following article for more details about cut-through and store and forward switches: Reasons for getting bad frames and CRC errors Many times, you need to work your way backward to the source of the CRC error. Understanding the architecture (cut through vs store forward) of the switches in the topology is imperative. A store and forward switch would drop a frame that failed a CRC check. If you experience CRC errors on an interface it does not mean that interface is the source of the problem. Store and forward switches look at the entire frame before making a forwarding decision. Other switches like the N7K are store and forward switches. Because of these frames that fail a CRC check will still be switched by a cut-through switch. Cut through switches make the forwarding decision before they can perform the CRC check. Some switches will drop the frame once they detect a frame is corrupted. Note: A CRC check is performed at the end of the frame to determine whether or not a frame has become corrupted. Bad frames get dropped by the destination server or when passing through a piece of network equipment that is not cut-through. #SHOW INTERFACE ERRORS SERIES#
The Cisco UCS Fabric Interconnect is a cut-through switch, like the Cisco Nexus 5000 Series Switches. Background Information on Cut-through and store-and-forward If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Cisco UCS 1200, 1300, and 1400 Series Virtual Interface Card (VIC).
Cisco UCS 2200, 23 Series Fabric extender I/O Module. Cisco UCS 6200, 6300, and 6400 Series Fabric Interconnect. 
Cisco UCS Manager version 2.x and later. #SHOW INTERFACE ERRORS SOFTWARE#
The information in this document is based on these software and hardware versions: Cut-through and store-and-forward switches.Cisco Unified Computing System Manager (UCSM) Command Line Interface (CLI).Cisco Unified Computing System Manager (UCSM).Cisco UCS Fabric extender I/O Module (IOM).Cisco UCS B-Series and C-Series servers.Cisco UCS Virtual Interface Card (VIC).This document assumes that you have knowledge of these topics: This document is intended to present commands used while troubleshooting network connectivity, drops, and CRC errors within different UCS Fabric Interconnects (FIs), IOMs, and VIC adapters generations.
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