Patent ID: 6728220
Filing Date: 2004-04-27
Classification: H04L

Abstract:
A method for preventing transmission loops between a plurality of network nodes that are connected by transmission links to form a ring, wherein each network node on said ring includes a right side ringport that is connected to a right side neighbor and a left side ringport that is connected to a left side neighbor and wherein each of said network nodes in said ring utilizes a label switching protocol that includes a label, said label including a label field for carrying a label value and a time-to-live (TTL) field for carrying a TTL value, said method comprising:generating, at a first one of said plurality of network nodes, a right side packet and a left side packet from an ingress packet; and setting a right side TTL value for said right side packet and a left side TTL value for said left side packet to values that prevent said right side packet and said left side packet from traveling on the same transmission link on said ring.