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Ensuring 1:1 MPLS tunnels are line card diverse through signaling and path computation

IP.com Disclosure Number: IPCOM000255728D
Publication Date: 2018-Oct-11
Document File: 7 page(s) / 349K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to ensuring 1:1 Multiprotocol Label Switching (MPLS) tunnels are line card diverse through signaling and path computation. Specifically, a new sub-Type-Length-Value (sub-TLV) is proposed in Intermediate System-Intermediate System (IS-IS) to detect line card information of all interfaces (e.g., Internet Protocol (IP) interfaces). The line card information denotes a specific hardware location of an interface. With this information, backup tunnels can be created as line card diverse providing better protection, i.e., the line card is not a single point of failure.

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Ensuring 1:1 MPLS tunnels are line card diverse through signaling and path computation

ABSTRACT

The present disclosure relates to ensuring 1:1 Multiprotocol Label Switching (MPLS) tunnels are line card diverse through signaling and path computation.  Specifically, a new sub-Type-Length-Value (sub-TLV) is proposed in Intermediate System-Intermediate System (IS-IS) to detect line card information of all interfaces (e.g., Internet Protocol (IP) interfaces).  The line card information denotes a specific hardware location of an interface.  With this information, backup tunnels can be created as line card diverse providing better protection, i.e., the line card is not a single point of failure.

DETAILED DESCRIPTION

The present disclosure relates to ensuring 1:1 Multiprotocol Label Switching (MPLS) tunnels are line card diverse through signaling and path computation.  Specifically, a new sub-Type-Length-Value (sub-TLV) is proposed in Intermediate System-Intermediate System (IS-IS) to detect line card information of all interfaces (e.g., Internet Protocol (IP) interfaces).  The line card information denotes a specific hardware location of an interface.  With this information, backup tunnels can be created as line card diverse providing better protection, i.e., the line card is not a single point of failure.

Abbreviations

CSPF

Constrained Shortest Path First

FB

Facility Bypass

FRR

Fast Re-Route

IGP

Interior gateway protocol (a type of protocol used for exchanging routing information between gateways (commonly routers) within an autonomous system)

IP

Internet Protocol

IS-IS

Intermediate System to Intermediate System (is a routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices)

MPLS

Multiprotocol Label Switching

RSVP

Resource Reservation Protocol (Protocol to create a dynamic tunnel with resource reservation and label allocation)

SRLG

Shared Risk Link Group

TLV

Type-Length-Value

Problem Statement:

In a chassis-based system, for a 1:1 protected MPLS dynamic tunnel scenario, a user preferably wants to create primary and backup tunnels from different line cards so that in case of line card failure traffic will remain unaffected. 

Currently, there exists a mechanism to create a backup tunnel as SRLG disjoint or node disjoint.  But there is no mechanism to create a backup tunnel which is line card disjoint from the primary tunnel.

Problem Description

As shown in the above diagram, consider a primary tunnel is created between LER1 and LER2 via the path shown in “Blue” color.

For a backup tunnel, there are two paths as shown in “Green” and “Red” color. One path is using the same line cards which are used by a primary tunnel (shown in “Red” color).  The other path is line card diverse from the primary tunnel (shown in “Green” color).

Currently, there is no mechanism to select a path for the backup tunnel which is line card diverse from the pri...