Method and apparatus for implementing L2 VPNs on an IP network
US8098656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2009 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Jul 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/76
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
MP-BGP VPN infrastructure based on IETF RFC 4364/2547 is used to configure a layer 2 VPN on an IP network. VRFs for the VPN are configured on Ethernet switches and service IP addresses are associated with each configured VRF. The service IP addresses are exchanged to enable VPN traffic to be encapsulated for transport over the IP network. To enable a L2 VPN to be established on the network, a VPN-VLAN ID will be configured for the L2 VPN and import/export route targets for the VPN-VLAN will be set in each VRF and UNI-VLAN that is part of the VPN. The VPN-VLAN will be announced to all PEs using MP-iBGP with export route targets set for this VPN-VLAN. The PE's control plane learns the VPN-VLAN on a logical port if the import RT matches the export RT received by the MP-iBGP control plane. Once the VPN-VLAN is learned on a logical port, the PE will perform MAC learning on that logical port and treat the logical port as if it were part of the L2 VLAN.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.