{"id":977,"date":"2016-03-14T06:19:01","date_gmt":"2016-03-14T06:19:01","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2016\/03\/14\/what-is-an-etherchannel\/"},"modified":"2021-07-31T11:14:30","modified_gmt":"2021-07-31T11:14:30","slug":"what-is-an-etherchannel","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html","title":{"rendered":"What is an EtherChannel ?"},"content":{"rendered":"<p>EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers<sup>[1]<\/sup>. All member ports within the bundle must have the same physical settings such as port type, speed and duplex. Traffic is load-shared across the ports. It is important to note that traffic is not loadbalanced, as load distribution is not always equals across all member ports.<\/p>\n<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-6629e3100ae5e\" 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-6629e3100ae5e\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Types\" title=\"Types\">Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Loadbalancing\" title=\"Loadbalancing\">Loadbalancing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Etherchannel_Guard\" title=\"Etherchannel Guard\">Etherchannel Guard<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Configuration_Options\" title=\"Configuration Options\">Configuration Options<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#PAgP\" title=\"PAgP\">PAgP<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Modes\" title=\"Modes\">Modes<\/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\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Create_PAgP_Bundle\" title=\"Create PAgP Bundle\">Create PAgP Bundle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Learning_Method\" title=\"Learning Method\">Learning Method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Show_Commands\" title=\"Show Commands\">Show Commands<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#LACP\" title=\"LACP\">LACP<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Modes-2\" title=\"Modes\">Modes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Create_LACP_Bundle\" title=\"Create LACP Bundle\">Create LACP Bundle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Show_Commands-2\" title=\"Show Commands\">Show Commands<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#HotStandby_Ports\" title=\"HotStandby Ports\">HotStandby Ports<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Port_Priority\" title=\"Port Priority\">Port Priority<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Manual\" title=\"Manual\">Manual<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\/#Reference\" title=\"Reference\">Reference<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Types\"><\/span>Types<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are 2 main types of etherchannel, Layer2 and Layer3,<\/p>\n<ul>\n<li><strong>Layer2<\/strong>&#8211; The bundle is configured as an access or trunk port.<\/li>\n<li><strong>Layer3<\/strong> -The bundle is configured with an IP address and the port is no longer defined as a switchport, using the command <span class=\"codeinline\">no switchport<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Loadbalancing\"><\/span>Loadbalancing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Various options on how the traffic is loadshared across the port members are available. This is configured on a global level.<\/p>\n<pre class=\"prettyprint\">Switch(config)#port-channel load-balance ?\r\n  dst-ip       Dst IP Addr\r\n  dst-mac      Dst Mac Addr\r\n  src-dst-ip   Src XOR Dst IP Addr\r\n  src-dst-mac  Src XOR Dst Mac Addr\r\n  src-ip       Src IP Addr\r\n  src-mac      Src Mac Addr<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Etherchannel_Guard\"><\/span>Etherchannel Guard<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>As standard a portchannel will present a single MAC address, the switch will use the MAC address of the first physical port that is initiated within the bundle.<\/p>\n<p>EtherChannel Guard is a feature that detects etherchannel misconfigurations between the switch and its neighbor. If more then one MAC address is seen from its neighbor the switch will place the interfaces into error-disabled. This prevents situations where one end is cabled to the wrong port which could lead to bridging loops.<\/p>\n<pre class=\"prettyprint\">(config)# spanning-tree etherchannel guard misconfig<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Configuration_Options\"><\/span>Configuration Options<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are 3 main etherchannel configuration options. They are,<\/p>\n<ul>\n<li><strong>PAgP<\/strong> &#8211; Port Aggregation Protocol (PAgP), a Cisco\u00a0proprietary standard for building etherchannels.<\/li>\n<li><strong>LACP<\/strong> &#8211; LACP (Link Aggregation Control Protocol) is an open standards protocol (IEEE802.3ad) for building etherchannels.<\/li>\n<li><strong>Manual<\/strong> &#8211; No negotiation protocol is used and the etherchannel is statically created.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"PAgP\"><\/span>PAgP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Port Aggregation Protocol\u00a0(PAgP) is a Cisco\u00a0proprietary standard that allows multiple physical interfaces to be aggregated into one logical link.<br \/>\nEach logical link can contain up-to 8 physical members.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Modes\"><\/span>Modes<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Within PAgP there are 2 modes available, <strong>Desirable <\/strong>and<strong> Auto.<\/strong><\/p>\n<ul>\n<li><strong>Desirable<\/strong> &#8211; Enables PAgP unconditionally ; Actively sends packets to its neighbor in order to negotiate PAgP.<\/li>\n<li><strong>Auto<\/strong> &#8211; Awaits PAgP packets from its neighbor before initiating PAgP<\/li>\n<\/ul>\n<p>In addition to these modes there are 2 forms of operation, <strong>Non-Silent<\/strong> and <strong>Silent<\/strong>.<\/p>\n<ul>\n<li><strong>Non-Silent<\/strong> &#8211; The bundle is not initiated until bidirectional traffic is detected. Non-Silent provides the ability to protect against unidirectional failures on fibre based connections.<\/li>\n<li><strong> Silent<\/strong> &#8211; This is the default setting on the majority of copper based switches. With this form of operation the bundle is initiated even if no traffic is seen.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Create_PAgP_Bundle\"><\/span>Create PAgP Bundle<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Creating an LACP bundle is simple, you define the port-channel number on each of the interfaces.<\/p>\n<pre class=\"prettyprint\">Switch(config-if)#interface range gi0\/1-3\r\n<span class=\"prettyprint\">Switch(config-if-range)#channel-group 33 mode desirable<\/span>\r\nCreating a port-channel interface Port-channel 33<\/pre>\n<h4><span class=\"ez-toc-section\" id=\"Learning_Method\"><\/span>Learning Method<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>There are 2 methods for learning, <strong>physical<\/strong> and <strong>aggregated.<\/strong><\/p>\n<ul>\n<li><strong>aggregation-port<\/strong> &#8211; (Default) The switch learns the addresses on the aggregated port. Traffic is sent back to the source using any of the ports within the bundle.<\/li>\n<li><strong>physical-port<\/strong> &#8211; The switch learns the source MAC address on the physical port the packet has come in on. Traffic is then sent back out the same physical port.<\/li>\n<\/ul>\n<p>Note : This is configured within the interface configuration.<\/p>\n<pre class=\"prettyprint\">Switch(config-if)# pagp learn-method physical-port<\/pre>\n<h4><span class=\"ez-toc-section\" id=\"Show_Commands\"><\/span>Show Commands<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>In addition to the <span class=\"codeinline\">show pagp &#8230;.<\/span> commands you can also review the status of the portchannel via the command below,<\/p>\n<pre class=\"prettyprint\">Switch#show etherchannel 33 summary \r\nFlags:  D - down        P - bundled in port-channel\r\n        I - stand-alone s - suspended\r\n        H - Hot-standby (LACP only)\r\n        R - Layer3      S - Layer2\r\n        U - in use      N - not in use, no aggregation\r\n        f - failed to allocate aggregator\r\n\r\n        M - not in use, minimum links not met\r\n        m - not in use, port not aggregated due to minimum links not met\r\n        u - unsuitable for bundling\r\n        w - waiting to be aggregated\r\n        d - default port\r\n\r\n        A - formed by Auto LAG\r\n\r\n\r\nNumber of channel-groups in use: 1\r\nNumber of aggregators:           1\r\n\r\nGroup  Port-channel  Protocol    Ports\r\n------+-------------+-----------+-----------------------------------------------\r\n33     Po33(SU)        PAgP      Gi0\/1(P)    Gi0\/2(P)    Gi0\/3(P)<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"LACP\"><\/span>LACP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>LACP (Link Aggregation Control Protocol) is an open standards protocol (IEEE802.3ad) that allows multiple physical interfaces to be aggregated into one logical link.<br \/>\nEach logical link can contain up-to 8 physical members.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Modes-2\"><\/span>Modes<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Within LACP there are 2 modes available, <strong>Active<\/strong> and <strong>Passive<\/strong>.<\/p>\n<ul>\n<li><strong>Active<\/strong> &#8211; Within Active mode the switch tries to negotiate and form LACP with its neighbor.<\/li>\n<li><strong>Passive<\/strong> &#8211; Within Passive mode LACP is enabled but the switch waits for the neighbor to initiate the negotiation LACP.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Create_LACP_Bundle\"><\/span>Create LACP Bundle<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Creating an LACP bundle is simple, you define the port-channel number onto each of the interfaces.<\/p>\n<pre class=\"prettyprint\">Switch(config-if)#interface range gi0\/1-3\r\n<span class=\"prettyprint\">Switch(config-if-range)#channel-group 33 mode active<\/span>\r\nCreating a port-channel interface Port-channel 33<\/pre>\n<h4><span class=\"ez-toc-section\" id=\"Show_Commands-2\"><\/span>Show Commands<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Below is an example of some of the common show commands.<\/p>\n<pre class=\"prettyprint\">Switch#sh lacp 33 neighbor \r\nFlags:  S - Device is requesting Slow LACPDUs \r\n        F - Device is requesting Fast LACPDUs\r\n        A - Device is in Active mode       P - Device is in Passive mode     \r\n\r\nChannel group 33 neighbors\r\n\r\nPartner's information:\r\n\r\n                  LACP port                        Admin  Oper   Port    Port\r\nPort      Flags   Priority  Dev ID          Age    key    Key    Number  State\r\nGi0\/1     SA      32768     fa16.3efa.dce3  24s    0x0    0x18   0x2     0x3D  \r\nGi0\/2     SA      32768     fa16.3efa.dce3   6s    0x0    0x18   0x3     0x3D  \r\nGi0\/3     SA      32768     fa16.3efa.dce3  16s    0x0    0x18   0x4     0x3<\/pre>\n<pre class=\"prettyprint\">Switch#sh lacp 33 counters \r\n             LACPDUs         Marker      Marker Response    LACPDUs\r\nPort       Sent   Recv     Sent   Recv     Sent   Recv      Pkts Err\r\n---------------------------------------------------------------------\r\nChannel group: 33\r\nGi0\/1       62     56       0      0        0      0         0     \r\nGi0\/2       64     56       0      0        0      0         0     \r\nGi0\/3       64     55       0      0        0      0         0<\/pre>\n<h4><span class=\"ez-toc-section\" id=\"HotStandby_Ports\"><\/span>HotStandby Ports<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>LACP allows you to define the number of active members within the bundle, in essence allowing you to create hot-standby bundle members.<\/p>\n<pre class=\"prettyprint\">Switch(config)#int po33\r\nSwitch(config-if)#lacp max-bundle ?\r\n&lt;1-8&gt; Max number of ports to bundle in this Port Channel<\/pre>\n<h4><span class=\"ez-toc-section\" id=\"Port_Priority\"><\/span>Port Priority<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>By setting priorities on each of the ports provides you with greater control and allows you to determine what ports are first added to the bundle and what ports are added into the bundle in the event of interface failure.<\/p>\n<pre class=\"prettyprint\">Switch(config)#int gi0\/3\r\nSwitch(config-if)#lacp port-priority 300<!--0-65535--><\/pre>\n<pre class=\"prettyprint\">Switch#sh lacp internal \r\nFlags:  S - Device is requesting Slow LACPDUs \r\n        F - Device is requesting Fast LACPDUs\r\n        A - Device is in Active mode       P - Device is in Passive mode     \r\n\r\nChannel group 33\r\n                            LACP port     Admin     Oper    Port        Port\r\nPort      Flags   State     Priority      Key       Key     Number      State\r\nGi0\/1     SA      bndl      32768         0x18      0x18    0x2         0x3D  \r\nGi0\/2     SA      bndl      32768         0x18      0x18    0x3         0x3D  \r\nGi0\/3     SA      bndl      300           0x18      0x18    0x4         0x3D<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Manual\"><\/span>Manual<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To configure a manual etherchannel bundle you define the port-channel number onto each of the interfaces.<\/p>\n<pre class=\"prettyprint\">Switch(config-if)#interface range gi0\/1-3\r\nSwitch(config-if-range)#channel-group 33 mode no\r\nCreating a port-channel interface Port-channel 33<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Reference\"><\/span>Reference<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/EtherChannel\">[1] https:\/\/en.wikipedia.org\/wiki\/EtherChannel<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers[1]. All member ports within the bundle must have the same physical settings &#8230; <a title=\"What is an EtherChannel ?\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/what-is-an-etherchannel.html\" aria-label=\"Read more about What is an EtherChannel ?\">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>What is an EtherChannel ? - Fir3net<\/title>\n<meta name=\"description\" content=\"EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. 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