Search

Maintaining accurate network state information in the Traffic Engineering Databases of each node along a network is extremely difficult. The BYPASS Based Routing (BBR) mechanism has appeared to reduce the effects produced in the network performance when selecting paths under inaccurate network state information. The BBR mechanism is based on applying the dynamic bypass concept. In this paper the BBR mechanism is modified to extend its applicability, and therefore to increase the benefits of its implementation. Keywords.QoS routing, inaccurate routing decisions, routing scalability. [ABSTRACT FROM AUTHOR]

In highly dynamic large IP/MPLS networks, when routing information includes not only topology information but also information to provide QoS, such as available link bandwidth, network state databases must be frequently updated. This updating process generates an important signaling overhead. Reducing this overhead implies having inaccurate routing information, which may cause both non-optimal path selection and a call-blocking increase. In order to avoid both effects in this paper we suggest a new QoS explicit routing mechanism called BYPASS Based Routing (BBR), which is based on bypassing those links along the selected path that potentially cannot cope with the traffic requirements. Routing algorithms derived from the proposed BBR mechanism reduce the call-blocking ratio without increasing the amount of routing control information. [ABSTRACT FROM AUTHOR]