A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Split Multi-link Trunking (SMLT)
Author(s) : R. Lapuh, et al.
Filename : draft-lapuh-network-smlt-05.txt
Pages : 14
Date : 2005-7-18
This document describes Split Multi-link Trunking (SMLT) for bridged
and routed networks. SMLT enables topologies with upstream node
redundancy for increased reliability of Layer 2 link aggregation
subnetworks based on [IEEE 802.3ad] and router redundancy based on
VRRP [RFC 2338].
SMLT is an improvement over Multi-Link Trunking (MLT), a method of
link aggregation that allows multiple Ethernet links to be aggregated
together, and handled as a single logical trunk. MLT can be realized
via many different link aggregation mechanisms. Several methods of
MLT are in use today; one example is [IEEE 802.3ad].
SMLT is MLT with links of a link-aggregation group connected to ports
on two different devices (e.g. SMLT client and aggregation device).
Unlike MLT, at least one end of a link-aggregated group is dual-homed
to two different SMLT aggregation devices. In many cases those
devices act as bridges (switches) as well as L3 routers (Routing
Switches). These two redundant SMLT aggregation devices can share one
or more VRRP routing instances; for that SMLT-VRRP extends the VRRP
functionality to an active-active router concept, where both SMLT
aggregation device route traffic for a common VRRP-ID, thus load
balancing traffic not only for L2 but also for L3.
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