US 2004/0165537 A1 · Prohibit or avoid route mechanisim for path setup

Abstract

The present invention discloses a solution which delivers routing systems with less path setup latency and causes them to be less susceptible to network loading, by providing them the ability to setup diverse paths as a result of specifying network resources to exclude as part of a path setup. The invention proposes an extension to RSVP-TE in the form of a new RSVP-TE object, known as an Exclude Route Object, which will allow, in a path setup request, the specification of a set of abstract nodes and resources to be explicitly excluded from the path. Additionally, the invention introduces a second type of exclusion which is achieved through a modification to the existing Explicit Route Object (ERO) by allowing a node to specify, in a path setup request, the exclusion of certain abstract nodes and resources between a specific pair of abstract nodes within an Explicit Route Object.

Claims18

Dependent claims

A method for establishing a path between a first node and a second node in a network in which said first node and said second node are in separate portions of said network, comprising the steps of:

(a) determining, by said first node, a loose route for said path to said second node;
(b) sending, by said first node to a third node, which is in a separate portion of said network than said first node and said second node, and is a part of said loose route, a path setup message that specifies said loose route and also specifies any network resources to exclude from said path;
(c) determining, by said third node, a route from said third node to said second node wherein the determined route excludes said network resources to be excluded from said path;
(d) modifying, by said third node, said path setup message by inserting said determined route therein;
and
(e) sending, by said third node, the modified path setup message to said second node, for completing establishment of said path.

3 more elements

Dependencies are inferred from the claim text.

Prohibit or avoid route mechanisim for path setup

Life of this patent

Prohibit or avoid route mechanisim for path setup

Life of this patent

Abstract

Claims18