December 2005
Intermediate to advanced
1066 pages
33h 38m
English
Content preview from Understanding Linux Network InternalsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Overview of Newer Spanning Tree Protocols
The convergence time of the 802.1D-1998 STP was acceptable when it was first defined several years ago by the IEEE committee. However, it has proven too slow over the years, given the higher availability requirements of newer network applications, such as interactive multimedia (IP telephony, video conferencing, etc.), not to mention the user expectations that continuously grow.
To address this issue, various commercial bridge producers came out with proprietary enhancements to the STP. Unfortunately, proprietary enhancements often cannot be used in heterogeneous networks that employ devices from different vendors.
Recently the IEEE came out with two newer protocols, Rapid Spanning Tree (RSTP ) and Multiple Spanning Tree (MSTP), that address all the significant shortcomings currently known in their older brother, 802.1D. We cannot describe the two protocols here because they would require quite some space (especially MSTP), and anyway, none of them is implemented in Linux (yet). In the following two subsections, we will just explore some of the main improvements offered by the new protocols. For more detail, I suggest the following documents:
Understanding Rapid Spanning Tree Protocol (802.1w) at http://www.cisco.com/warp/public/473/146.html
Understanding Multiple Spanning Tree Protocol (802.1s) at http://www.cisco.com/warp/public/473/147.html
Rapid Spanning Tree Protocol (RSTP)
The RSTP is backward compatible with 802.1D, so bridges running ...
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