Patent ID: 7944942
Filing Date: 2011-05-17
Classification: H04L

Abstract:
1. A method for converting a Point-to-Point Protocol (PPP) identifier (PPP ID) value to an Ethernet Virtual Local Area Network (VLAN) tag identifier (ID) value, the method comprising: receiving a PPP frame, the PPP frame including at least a PPP identifier (PPP ID) value; converting the PPP ID value to an Ethernet VLAN tag ID value corresponding to the PPP ID value, wherein converting the PPP ID value to an Ethernet VLAN tag ID value corresponding to the PPP ID is based on a PPP ID look up table (LUT) that maps the PPP ID value to the corresponding Ethernet VLAN tag ID value, the PPP ID LUT having a plurality of PPP ID registers, each PPP ID register having stored therein a different PPP ID register value against which the PPP ID value may be compared, wherein the converting is further: comparing the PPP ID value against the different PPP ID register values to determine whether there is a matching PPP ID register value, the matching PPP ID register value matching the PPP ID value, determining a corresponding VLAN tag ID register, the corresponding VLAN tag ID register corresponding to the PPP ID register having stored therein the matching PPP ID register value, and obtaining the VLAN tag ID value from the corresponding VLAN tag ID register; and outputting an Ethernet frame including the Ethernet VLAN tag ID value corresponding to the PPP ID value.