Abstract
The ever-increasing popularity and traffic volume of multicast applications
motivates the need for development of methodologies for traffic management
and network design that especially cater for multicast traffic. Addressing
the disparity between the bandwidth offered by a wavelength and the bandwidth
required by a single connection is a key challenge in the efficient usage
of any wavelength-division multiplexing (WDM) network. This problem is also
relevant to WDM networks that support multicast traffic and can be mitigated
by multicast traffic grooming. This paper considers multicast traffic grooming
with a leaking strategy where a light-tree may deliver the traffic of a multicast
connection to nodes that are not in the destination set of the connection.
This leaking strategy improves the sharing of light-trees and add/drop ports,
leading to lower blocking ratios. Two multicast traffic grooming algorithms
with leaking strategy, namely, multicast traffic leaky grooming (MTLG), and
multicast traffic hybrid grooming (MTHG) are proposed. MTLG grooms traffic
to light-trees if the traffic leaked is less than a given threshold value.
MTHG first grooms traffic to light-trees without leaking; if some destinations
remain, it then grooms traffic to light-trees with leaking. MTHG is an improvement
over MTLG as it can attain higher light-tree sharing with less traffic leaked.
Simulations show that the two proposed algorithms perform better than other
algorithms at low add/drop port ratios with MTHG showing better performance.
© 2012 IEEE
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