{"id":976,"date":"2016-03-13T21:22:52","date_gmt":"2016-03-13T21:22:52","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/?p=976"},"modified":"2021-07-27T17:03:47","modified_gmt":"2021-07-27T17:03:47","slug":"port-aggregation-protocol-pagp","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Switches\/Cisco\/port-aggregation-protocol-pagp.html","title":{"rendered":"Port Aggregation Protocol (PAgP)"},"content":{"rendered":"<p>Port Aggregation Protocol\u00a0(PAgP) is a Cisco priority standard 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 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 the are 2 forms of operation,\u00a0<strong>Non-Slient<\/strong> and <strong>Slient<\/strong>.<\/p>\n<ul>\n<li><strong>Non-Silent<\/strong> &#8211; The bundle is not initiated until bidirectional traffic is detected. Non-Slient provides the ability to protect against unidirectional failures on fibre based connections.<\/li>\n<li><strong> Silent<\/strong> &#8211; Default 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<h2>Create PAgP 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\nSwitch(config-if-range)#channel-group 33 mode desirable\r\nCreating a port-channel interface Port-channel 33<\/pre>\n<h2>Learning Method<\/h2>\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<h2>Show Commands<\/h2>\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<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Port Aggregation Protocol\u00a0(PAgP) is a Cisco priority standard 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 PAgP there are 2 modes &#8230; <a title=\"Port Aggregation Protocol (PAgP)\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Switches\/Cisco\/port-aggregation-protocol-pagp.html\" aria-label=\"Read more about Port Aggregation Protocol (PAgP)\">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>Port Aggregation Protocol (PAgP) - Fir3net<\/title>\n<meta name=\"description\" content=\"Port Aggregation Protocol\u00a0(PAgP) is a Cisco priority standard that allows multiple physical interfaces to be aggregated into one logical link. 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