A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Abridges as Rbridges: Transparent Routing with
Simplified Multiple Spanning Trees
Author(s) : G. Ibanez, et al.
Filename : draft-gibanez-trill-abridge-00.txt
Pages : 17
Date : 2005-12-9
Rbridges are link layer devices that use routing protocols as a control
plane but do not target to scale up to large campus networks. This
document contains an alternative proposal to link-state Rbridges, named
Abridges. Abridges overcome Rbridges L2 network size restrictions
allowing applicability to very large Ethernet campus networks while
maintaining zero configuration and high performance, by assuming a
topological restriction that is automatically performed. The proposal
includes a two-layered network architecture with two hierarchical
independent spanning tree layers. Expected convergence is fast, probably
below two seconds.
Abridges use multiple simplified spanning trees rooted at core edge
bridges to achieve results comparable to Rbridges with lower
computational complexity. Two implementation variants of simplified
multiple spanning trees are proposed: The first one is a fundamental
simplification of the standard Multiple Spanning Tree protocol and the
second one (still in a very preliminary stage) consists of an N-multiple
simultaneous execution of the Rapid Spanning Tree protocol at each
Rbridge.
An optional mechanism of ARP/Abridge servers/registrars (with load
splitting) is proposed to limit ARP traffic in large scale Ethernet
networks and to enhance scalability and security. This mechanism can also be used for host-Designated Rbridge resolution as an alternative to the interchange of Hosts Lists between Rbridges.
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