{"id":975,"date":"2016-03-13T15:05:05","date_gmt":"1999-01-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/?p=975"},"modified":"2021-07-31T19:11:43","modified_gmt":"2021-07-31T19:11:43","slug":"link-aggregation-control-protcol-lacp","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/switches\/cisco-switches\/link-aggregation-control-protcol-lacp.html","title":{"rendered":"Link Aggregation Control Protcol (LACP)"},"content":{"rendered":"<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. All member ports within the bundle must have the same physical settings such as port type, speed and duplex.<\/p>\n<h2>Modes<\/h2>\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<h2>Create LACP Bundle<\/h2>\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<h2>Show Commands<\/h2>\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     0x3D<\/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<p>LACP provides the ability to define the number of active members within the bundle, in essence allowing you to have 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<h2>Port Priority<\/h2>\n<p>Once you have configured the maximum ports allowed within a bundle the port priority can be configured. Setting priority&#8217;s 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 Switch(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","protected":false},"excerpt":{"rendered":"<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. Each logical link can contain up-to 8 physical members. All member ports within the bundle must have the same physical settings such as port type, speed and duplex. Modes Within LACP there &#8230; <a title=\"Link Aggregation Control Protcol (LACP)\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/switches\/cisco-switches\/link-aggregation-control-protcol-lacp.html\" aria-label=\"Read more about Link Aggregation Control Protcol (LACP)\">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>Link Aggregation Control Protcol (LACP) - Fir3net<\/title>\n<meta name=\"description\" content=\"LACP (Link Aggregation Control Protocol) is an open standards protocol (IEEE802.3ad) that allows multiple physical interfaces to be aggregated into one\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fir3net.com\/switches\/cisco-switches\/link-aggregation-control-protcol-lacp.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Link Aggregation Control Protcol (LACP) - 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