Browse Prior Art Database

Reserve VMAN ID to Identify Applications

IP.com Disclosure Number: IPCOM000124529D
Published in the IP.com Journal: Volume 5 Issue 5 (2005-05-20)
Included in the Prior Art Database: 2005-May-20
Document File: 1 page(s) / 21K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In order to provide differentiated services or applications in an Ethernet, some network nodes such as IP-DSLAM (Internet Protocol - Digital Subscriber Line Access Multiplexer) need to know which application is carried in a certain frame. So far it was not possible to identify the character of a carried application in an easy way. The Differentiated Services Field (DS Field) was defined in the Internet Protocol Version IPv4 and IPv6 (according to RFC2474). This field belongs to Layer3 so it can only be marked by the first-hop router or host. A Layer2 switch cannot mark this field. In the access area Layer2 (the so called 'first mile') switches are popularly used to optimize capital expenditures and system performance. Therefore the DS Field cannot be used to mark applications in this area. A new solution uses the VMAN (Virtual Metro Area Net) technology to provide a virtual private network within a so called metro area network. The range of VMAN IDs (VMAN Identifiers) is number 0 to number 4095. The new idea is to reserve some VMAN IDs to identify applications globally in any metro network area. For example, 4000 - 4095 can be defined to identify the application carried in the following frames.

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Reserve VMAN ID to Identify Applications

Idea: Ligang Tian, CN-Beijing; Dr. Walter Kopetzky, DE-Munich

In order to provide differentiated services or applications in an Ethernet, some network nodes such as IP-DSLAM (Internet Protocol - Digital Subscriber Line Access Multiplexer) need to know which application is carried in a certain frame. So far it was not possible to identify the character of a carried application in an easy way.

The Differentiated Services Field (DS Field) was defined in the Internet Protocol Version IPv4 and IPv6 (according to RFC2474). This field belongs to Layer3 so it can only be marked by the first-hop router or host. A Layer2 switch cannot mark this field. In the access area Layer2 (the so called 'first mile') switches are popularly used to optimize capital expenditures and system performance. Therefore the DS Field cannot be used to mark applications in this area.

A new solution uses the VMAN (Virtual Metro Area Net) technology to provide a virtual private network within a so called metro area network. The range of VMAN IDs (VMAN Identifiers) is number 0 to number 4095.

The new idea is to reserve some VMAN IDs to identify applications globally in any metro network area. For example, 4000 - 4095 can be defined to identify the application carried in the following frames. The advantages gained by the solution described above are:

1. Differentiated services can be realized easily in a metro area.
2. The type of applications can be easily...