Comments on: Weekly Open Ended Question #11 http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-11/ Just another Cisco blog Mon, 23 Jan 2012 23:37:03 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Hoan http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-11/comment-page-1/#comment-744 Hoan Thu, 29 Apr 2010 04:45:54 +0000 http://blog.alwaysthenetwork.com/?p=912#comment-744 PIM means Protocol Independent Multicast. It had two modes: dense-mode and sparse-mode. Dense-mode use source-based tree while sparse-mode use shared-tree. PIM means Protocol Independent Multicast. It had two modes: dense-mode and sparse-mode. Dense-mode use source-based tree while sparse-mode use shared-tree.

]]> By: Blake http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-11/comment-page-1/#comment-731 Blake Tue, 27 Apr 2010 02:09:22 +0000 http://blog.alwaysthenetwork.com/?p=912#comment-731 PIM is used for routing multicast traffic. PIM-DM forwards multicast traffic to all PIM neighbors by default until a neighbor indicates the group traffic is unwanted. PIM-SM utilizes an RP to track groups that are available, and routers only forward multicast traffic to portions of the network in which clients reside. PIM Sparse/Dense utilizes SM methodology unless an RP is unknown, in which case it follows DM rules. This is the short answer of course =) -Blake PIM is used for routing multicast traffic. PIM-DM forwards multicast traffic to all PIM neighbors by default until a neighbor indicates the group traffic is unwanted. PIM-SM utilizes an RP to track groups that are available, and routers only forward multicast traffic to portions of the network in which clients reside. PIM Sparse/Dense utilizes SM methodology unless an RP is unknown, in which case it follows DM rules.

This is the short answer of course =)

-Blake

]]> By: Stuart Howlette http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-11/comment-page-1/#comment-729 Stuart Howlette Mon, 26 Apr 2010 20:14:03 +0000 http://blog.alwaysthenetwork.com/?p=912#comment-729 Protocol Independent Multicast Three modes if you take Cisco's word for it. Sparse, Dense and Sparse Dense Dense using Source Trees, in that they branch out to every router to find which ones are in a certain multicast group, and then prune those that aren't. Sparse uses RPs and Shared Trees, so that routers only become part of the multicast process when they request to be part of the group. They do this by using a Rendezvous point. It's not as quick, and can lead to some inefficient multicast routing, but it severely cuts down on the network bandwidth used. Sparse Dense is where Sparse is used whenever possible (when RPs are configured), but Dense mode when none is configured. Protocol Independent Multicast

Three modes if you take Cisco’s word for it.

Sparse, Dense and Sparse Dense

Dense using Source Trees, in that they branch out to every router to find which ones are in a certain multicast group, and then prune those that aren’t.

Sparse uses RPs and Shared Trees, so that routers only become part of the multicast process when they request to be part of the group. They do this by using a Rendezvous point. It’s not as quick, and can lead to some inefficient multicast routing, but it severely cuts down on the network bandwidth used.

Sparse Dense is where Sparse is used whenever possible (when RPs are configured), but Dense mode when none is configured.

]]> By: Daniel http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-11/comment-page-1/#comment-728 Daniel Mon, 26 Apr 2010 13:58:54 +0000 http://blog.alwaysthenetwork.com/?p=912#comment-728 sparse has a centrilised rally point thingy that all mulitcast meets at and it is distributed from there This is good cause it scales well Dense reverces the path from the client to the host, easy to setup but doesn't scale well sparse-dense operates in sparse mode unless there is no RP, if there isn't it operates in dense mode sparse has a centrilised rally point thingy that all mulitcast meets at and it is distributed from there
This is good cause it scales well

Dense reverces the path from the client to the host, easy to setup but doesn’t scale well

sparse-dense operates in sparse mode unless there is no RP, if there isn’t it operates in dense mode

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