The multicast shortest path tree, can someone explain this for me. Does dense mode use this or only sparse mode?
This is used by both sparse and dense mode. In a nutshell, SPT is the shortest path from the sender of the mcast feed to the receivers. Dense mode will only use SPT. Sparse mode on the other hand will start with an RPT which is a tree rooted at the RP and then after a configurable threshold is reached, it will revert to SPT. You can disable SPT switchover if you want.
There is a lot more information on this, but this should give you a good sense to begin with..
Dense mode uses only SPTs. Sparse mode uses both Shared Trees and Shortest Path Trees. We have a video series on Multicast that would help: http://www.ine.com/self-paced/ccie-routing-switching/bootcamps/ccie-routing-switching-deep-dive-multicast-courses.htm Also the Cisco Press Developing IP Multicast Networks is a really good book.
Brian McGahan, CCIE #8593 (R&S/SP/Security)
Internetwork Expert, Inc.
From: [email protected] [mailto:[email protected]] On Behalf Of justin0104Sent: Wednesday, August 29, 2012 8:30 PMTo: Brian McGahanSubject: [CCIE R&S] Multicast SPT?
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