The IETF TRILL Protocol - apricot

105 Pages·2013·4.3 MB·English

by  Sarah Hu

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The IETF TRILL Protocol r
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Transparent Interconnection of Lots of Links 1
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Donald E. Eastlake, 3rd 0
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Co-Chair, TRILL Working Group
Principal Engineer, Huawei
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[email protected]
Donald E. Eastlake, 3rd
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Principal Engineer at Huawei Technologies b
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—  Formerly with Cisco and before that Motorola. 2
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Co-Chair of the IETF TRILL Working Group
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Chair of the IETF PPPEXT Working Group
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—  Chair of the IEEE 802.11ak Task Group - A
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Author of 59 IETF RFCs. I
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Note:
This tutorial represents my personal
views, not those of the TRILL WG or
Huawei. It is a high level technical
overview. It is not practical to include all
the details in the specification documents
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in a presentation of this length.
CONTENTS
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What is TRILL? y
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TRILL Features 3
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3.  TRILL History 8.  TRILL OAM IL
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Two TRILL Peering and Layers A
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Examples C
TRILL Comparison
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5.  How TRILL Works 11.  TRILL 01
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Example Packet Implementations
6. 
Processing
Standardization
12. 
Fine Grained Status
7. 
Labeling
References
13. 
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W TRILL?
HAT IS
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A Compatible Protocol
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Attached end nodes just think it is Ethernet.
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The more bridges you convert to TRILL switches,
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the better your network’s stability and bandwidth C
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utilization. 2
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Terminates Spanning Tree Protocols
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NSPIRED BY A
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EAL IFE NCIDENT
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In November 2002, Beth Israel Deaconess y
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Hospital in Boston, Massachusetts, had a total
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network meltdown: T
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—  Their network took four days of heroic efforts to be -

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restored to an operational state! In the mean time the P
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staff was reduced to using paper and pencil.
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—  Beth Israel Deaconess had grown by acquiring various 0
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clinics and just plugged all those bridged networks
together.
The article in Boston’s primary newspaper specifically
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mentioned “Spanning Tree Protocol” as the problem!
Radia Perlman, who invented spanning tree over 25
— 
years ago, decided it was time to come up with a better
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way.
W TRILL?
HAT IS
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Basically a simple idea:
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Encapsulate native Ethernet frames in a transport
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header providing a hop count R
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Route the encapsulated frames using IS-IS -
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—  Decapsulate native frames before delivery I
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Provides
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Least cost paths with zero/minimal configuration
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Equal Cost Multi-Pathing of unicast traffic
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Multi-pathing of multi-destination traffic
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A TRILL C
AMPUS
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L3
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 end
 sta)on
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L3
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Router
  Bridge

  2
Router
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=
 Ethernet

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RB4

RB1
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 Any

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Bridge

 technology
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RB5
  C
RB2
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RB3

2
Bridge

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  3
RB6

End stations and Layer 3 routers are connected to TRILL
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switches by Ethernet.
TRILL switches can be connected to each other with
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arbitrary technology.
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In both cases, the connection can be a bridged LAN.
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W TRILL?
HAT IS
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TRansparent Interconnection of Lots of Links y
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TRILL WG Charter 3
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http://www.ietf.org/dyn/wg/charter/trill-charter.html R
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Standardized by IETF TRILL Working Group:
— 
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Donald E. Eastlake 3rd (Huawei), Co-Chair
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Erik Nordmark (Cisco), Co-Chair O
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Jon Hudson (Brocade), Secretary 0
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TRILL Switch/ RBridge (Routing Bridge)
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Device that implements TRILL
— 
TRILL/RBridge Campus
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A network of RBridges, links, and any intervening
— 
bridges, bounded by end stations / layer 3 routers.
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CONTENTS
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What is TRILL? y
1. 
2
0
1
TRILL Features 3
2. 
T
R
3.  TRILL History 8.  TRILL OAM IL
L

-
Two TRILL Peering and Layers A
4.  9.  P
R
I
Examples C
TRILL Comparison
10.  O
T

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5.  How TRILL Works 11.  TRILL 01
3

Example Packet Implementations
6. 
Processing
Standardization
12. 
Fine Grained Status
7. 
Labeling
References
13. 
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U L C P
NICAST EAST OST ATHS
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=
 end
 sta)on

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B3

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A three bridge network
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