Handling of received implicit null packets

Details Handling of received implicit null packets Handling of received implicit null packets

2011-05-17

2011-05-17

Harper, Kevin C (Department: 2466)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S400000, C709S238000

Reexamination Certificate

active

07944924

ABSTRACT:
A router includes a network ingress processor and a network egress processor. The network ingress processor is configured for modifying a received MPLS packet such that an internal header thereof includes a pre-configured IP flow identifier therein in place of an as-received MPLS flow identifier. Such modifying is performed in response to the network ingress processor parsing a MPLS label stack of the received MPLS packet to determine if an existing MPLS label of the label stack needs to be replaced with an Implicit Null label and in response to determining that there is no other label in the MPLS label stack. The network egress processor includes a flow selector configured for directing packets dependent upon a type of flow identifier included in an internal header thereof, for receiving the modified MPLS packet, and for replacing the internal header with a port-specific header.

REFERENCES:
patent: 6526056 (2003-02-01), Rekhter et al.
patent: 6603756 (2003-08-01), Tappan
patent: 2007/0076732 (2007-04-01), Kim
patent: 2009/0141721 (2009-06-01), Filsfils
patent: 2009/0168780 (2009-07-01), Unbehagen et al.
patent: 2010/0080169 (2010-04-01), Berzin

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