Transparent Interconnection of Lots of Links
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Transparent Interconnection of Lots of Links WG
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TRILL Charter Draft July 2013
The TRILL WG has specified a solution for transparent unicast
shortest-path and multi-destination frame routing in multi-hop
networks with arbitrary topology. End stations, including Layer 3
routers, are connected to TRILL switches through IEEE 802.1-compliant
Ethernet. TRILL switches may be interconnected with multi-access or
point-to-point links of arbitrary technology.
The current work of the working group is around operational support
and additional extensions and optimizations of TRILL for the
properties of the networks on which it is deployed. The TRILL WG may
also produce corrections, clarifications, and updates of existing
The WG will work on the following items:
(1) Specify the handling of Operations, Administration, and
Maintenance (OAM) in networks using TRILL taking into consideration
existing OAM mechanisms that might apply to TRILL.
(2) Active-Active connection at the edge of a TRILL campus to provide
multiply connected end stations with flow level load spreading and
rapid adaptation to link failure similar to that provide for TRILL
(3) Development, within the TRILL protocol context, of requirements
and specifications for broadcast/multicast (multi-destination) frame
reduction, for example ARP/ND (Neighbor Discovery) reduction through
use of the TRILL ESADI protocol.
(4) Support of TRILL over pseudowires and IP tunnels between TRILL
switches, for example to connect branch office TRILL switches to a
central campus over the Internet.
(5) Support in TRILL for IS-IS multi-level routing to improve scaling
and for IS-IS multi-topology routing to provide different topologies
for different classes or types of traffic.
(6) Specification of a reduced TRILL control plane for error isolation
and interconnection between affiliated campuses under common
(7) Analyze the use of IS-IS security in TRILL and determine if any
work is needed to accommodate any specific TRILL control or data plane
security leveraging IS-IS security.
(8) Produce an interoperability / implementation report for TRILL.
The TRILL WG will continue to work with other IETF working groups such
as the ISIS WG, and SDO groups such as IEEE 802.1 through established
inter-WG relationships and SDO liaison processes, including early and
WG last call review by the ISIS WG of documents extending IS-IS