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Eastlake_RBridge_N48
RBridges
and the IETF TRILL Protocol
Donald E. Eastlake 3rd
d3e3e3@, +1-508-333-2270
D
ecem
ber 2009
1
TRILL Protocol
CONTENTS
? Introduction
? TRILL Features
? Are RBridges Bridges or Routers?
? Example Network
? How RBridges Work
? TRILL Encapsulation
? Additional Details
? References
D
ecem
ber 2009
2
TRILL Protocol
DEFINITIONS
? TRILL –
TRansparent Interconnection of Lots of Links
? A standard specified by the IETF (Internet
Engineering Task Force) TRILL Working Group co-
chaired by
? Donald E. Eastlake 3rd, Stellar Switches
? Erik Nordmark, Sun Microsystems
? RBridge – Routing Bridge
? A device which implements the TRILL protocol
? RBridge Campus –
? A network of RBridges, links, and possibly
intervening bridges bounded by end stations.
D
ecem
ber 2009
3
TRILL Protocol
WHAT/WHY/WHO TRILL?
? What is TRILL?
? TRILL is a new protocol to perform Layer 2 customer
bridging with IS-IS link state routing.
? Why do TRILL?
? Provides optimum point-to-point forwarding with
zero configuration.
? Supports multi-pathing of both unicast and multi-
destination traffic.
? Supports rapid failover.
? Who started TRILL?
? Radia Perlman, the inventor of the Spanning Tree
Protocol.
D
ecem
ber 2009
4
TRILL Protocol
NOTE:
? This presentation is just a brief technical
overview. It is not possible to include all the
details in the 90+ page base protocol specification
document.
? The specification is quite stable and has received
substantial review. The current -15 version of the
specification has been passed up from the
Working Group for IETF approval on the
standards track.
D
ecem
ber 2009
5
TRILL Protocol
CONTENTS
? Introduction
? TRILL Features
? Optimum Point-to-Point Forwarding
? Multi-Pathing
? Other Features
? Are RBridges Bridges or Routers?
? Example Network
? How RBridges Work
? TRILL Encapsulation
? Additional Details
? References
D
ecem
ber 2009
6
TRILL Protocol
OPTIMUM POINT-TO-POINT
FORWARDING Decem
ber 2009
7
= end station
B2B3
B1
A three bridge network
TRIL
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