{"id":559,"date":"2011-07-11T07:48:14","date_gmt":"2011-07-11T07:48:14","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2011\/07\/11\/troubleshooting-interface-drops-on-a-cisco-switch\/"},"modified":"2021-07-30T14:39:33","modified_gmt":"2021-07-30T14:39:33","slug":"troubleshooting-interface-drops-on-a-cisco-switch","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html","title":{"rendered":"Troubleshooting Interface Drops"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6629e33cc9905\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6629e33cc9905\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Introduction\" title=\"Introduction\">Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Output_Drop_Totals\" title=\"Output Drop Totals \n\">Output Drop Totals \n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Changing_Load-Intervals\" title=\"Changing Load-Intervals\">Changing Load-Intervals<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Interface_Ultization\" title=\"Interface Ultization\">Interface Ultization<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Additional_Errors\" title=\"Additional Errors\">Additional Errors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Options\" title=\"Options\">Options<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\/#Reference\" title=\"Reference\">Reference<\/a><\/li><\/ul><\/nav><\/div>\n<h4><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong>Introduction<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span class=\"content\">Output drops are a result of the traffic rate exceeding the maximum bandwidth specification of a given interface. Given that this is normally an outcome to interface congestion the following steps explain the commands used to clarify the total interface usage in both terms of Mbits and overall utilization.<br \/>\n<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Output_Drop_Totals\"><\/span><span class=\"content\"><strong>Output Drop Totals<\/strong><br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span class=\"content\">To confirm the total drops of a particular port the following command is run:<br \/>\n<\/span><\/p>\n<p class=\"codemulti\">switch#sh int fa0\/1 | in drop|bits<br \/>\nInput queue: 0\/75\/0\/0 (size\/max\/drops\/flushes); <strong>Total output drops: 142478<\/strong><br \/>\n5 minute input rate 1079000 bits\/sec, 5524 packets\/sec<br \/>\n5 minute output rate 8688000 bits\/sec, 9018 packets\/sec<\/p>\n<p><span style=\"font-family: Arial; font-size: x-small;\"><span style=\"font-family: Arial; font-size: x-small;\"><span style=\"font-size: 10pt;\">\u00a0We can also see the interface errors using the following command. The output errors are report here as OutDiscards.<br \/>\n<\/span><\/span><\/span><\/p>\n<p class=\"codemulti\">switch#show interface FastEthernet0\/1 counters errors<br \/>\nPort\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Align-Err\u00a0\u00a0\u00a0\u00a0 FCS-Err\u00a0\u00a0\u00a0 Xmit-Err\u00a0\u00a0\u00a0\u00a0 Rcv-Err\u00a0 UnderSize\u00a0 <strong>OutDiscards<\/strong><br \/>\nFa0\/1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <strong>179107<\/strong><\/p>\n<p>Port\u00a0\u00a0\u00a0\u00a0\u00a0 Single-Col\u00a0 Multi-Col\u00a0\u00a0 Late-Col\u00a0 Excess-Col\u00a0 Carri-Sen\u00a0\u00a0\u00a0\u00a0\u00a0 Runts\u00a0\u00a0\u00a0\u00a0 Giants<br \/>\nFa0\/1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Changing_Load-Intervals\"><\/span><strong>Changing Load-Intervals<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>As you can see from the previous section the load-intervals are configured to 5 minute intervals. To obtain a clearer view of the total throughput of a given interface the load-interval can be reduced to a lower value.<\/p>\n<p>Below we change the load-interval to 30 secs:<\/p>\n<p class=\"codemulti\">switch(config)#interface FastEthernet0\/1<br \/>\nswitch(config-if)#load-interval 30<\/p>\n<p class=\"codemulti\">switch#sh int fa0\/1 | in drop|bits<br \/>\nInput queue: 0\/75\/0\/0 (size\/max\/drops\/flushes); Total output drops: 142478<br \/>\n<strong>30 second input rate 10079000 bits\/sec<\/strong>, 5524 packets\/sec<br \/>\n<strong>30 second output rate 86888000 bits\/sec<\/strong>, 9018 packets\/sec<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Interface_Ultization\"><\/span><strong>Interface Ultization<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>To view the overall utilization (%) of an interface the following command is run:<\/p>\n<p class=\"codemulti\">switch#sh controllers fastEthernet 0\/1 utilization<br \/>\nReceive Bandwidth Percentage Utilization\u00a0\u00a0 : 13<br \/>\nTransmit Bandwidth Percentage Utilization\u00a0 : 100<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Additional_Errors\"><\/span><strong>Additional Errors<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>To display further details of the traffic that has transversed the interface the following command is run :<\/p>\n<p class=\"codemulti\">switch#sh controllers ethernet-controller fastEthernet 0\/1<br \/>\nTransmit FastEthernet0\/1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Receive<br \/>\n1755650038 Bytes\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 550748297 Bytes<br \/>\n565241190 Unicast frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3235647489 Unicast frames<br \/>\n19304109 Multicast frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Multicast frames<br \/>\n3784939 Broadcast frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 671 Broadcast frames<br \/>\n0 Too old frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 550705353 Unicast bytes<br \/>\n0 Deferred frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Multicast bytes<br \/>\n0 MTU exceeded frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 42944 Broadcast bytes<br \/>\n0 1 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Alignment errors<br \/>\n0 2 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 FCS errors<br \/>\n0 3 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Oversize frames<br \/>\n0 4 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Undersize frames<br \/>\n0 5 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Collision fragments<br \/>\n0 6 collision frames<br \/>\n0 7 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1912867443 Minimum size frames<br \/>\n0 8 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3138104280 65 to 127 byte frames<br \/>\n0 9 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 80595969 128 to 255 byte frames<br \/>\n0 10 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 29329601 256 to 511 byte frames<br \/>\n0 11 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 551146604 512 to 1023 byte frames<br \/>\n0 12 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1818571559 1024 to 1518 byte frames<br \/>\n0 13 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Overrun frames<br \/>\n0 14 collision frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Pause frames<br \/>\n0 15 collision frames<br \/>\n0 Excessive collisions\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Symbol error frames<br \/>\n0 Late collisions\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Invalid frames, too large<br \/>\n0 VLAN discard frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Valid frames, too large<br \/>\n0 Excess defer frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Invalid frames, too small<br \/>\n2417481382 64 byte frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Valid frames, too small<br \/>\n1021375875 127 byte frames<br \/>\n691455767 255 byte frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Too old frames<br \/>\n562825073 511 byte frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 Valid oversize frames<br \/>\n292399558 1023 byte frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 System FCS error frames<br \/>\n4192727175 1518 byte frames\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 RxPortFifoFull drop frame<br \/>\n0 Too large frames<br \/>\n0 Good (1 coll) frames<br \/>\n0 Good (&gt;1 coll) frames<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Options\"><\/span><strong>Options<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Unfortunately there are only 2 solutions to output drops. These are :<\/p>\n<ol>\n<li>Increase the interface speed.<\/li>\n<li>Reduce the traffic throughput.<\/li>\n<\/ol>\n<h4><span class=\"ez-toc-section\" id=\"Reference\"><\/span><strong>Reference<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><a href=\"http:\/\/www.cisco.com\/en\/US\/products\/hw\/routers\/ps133\/products_tech_note09186a0080094791.shtml\">http:\/\/www.cisco.com\/en\/US\/products\/hw\/routers\/ps133\/products_tech_note09186a0080094791.shtml<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Output drops are a result of the traffic rate exceeding the maximum bandwidth specification of a given interface. Given that this is normally an outcome to interface congestion the following steps explain the commands used to clarify the total interface usage in both terms of Mbits and overall utilization. Output Drop Totals To confirm &#8230; <a title=\"Troubleshooting Interface Drops\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Cisco-Catalyst\/troubleshooting-interface-drops-on-a-cisco-switch.html\" aria-label=\"Read more about Troubleshooting Interface Drops\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Troubleshooting Interface Drops - Fir3net<\/title>\n<meta name=\"description\" content=\"Introduction Output drops are a result of the traffic rate exceeding the maximum bandwidth specification of a given interface. 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