802.1AQ SUPPORT OVER IETF EVPN

• US 20130301472A1
• Filed: 08/24/2012
• Published: 11/14/2013
• Est. Priority Date: 05/10/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Allan, David Ian
• Granted Patent: US 8,867,367 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 12/4658 wherein a VLAN tag represents a service provider backbone VLAN, e.g. B-Tag, S-Tag
• CPC Class Codes: H04L 12/4662 wherein a VLAN tag represents a service instance, e.g. I-SID in PBB
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04L 45/66 Layer 2 routing, e.g. in Ethernet based MAN's
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols

Abstract

A method is implemented in a multiprotocol label swapping (MPLS) edge switch (PE) for interworking the 802.1aq control plane with an Ethernet Virtual Private Network (EVPN) Border Gateway Protocol (BGP) control plane. The method and system elect designated forwarders (DFs) for a given Backbone-Virtual Local Area Network Identifier (B-VID) in a local Provider Backbone Bridged Network (PBBN) and thereby determine which PE uniquely transfers specific I-Component Source Identifier (I-SID) and Media Access Control (MAC) information for the B-VID from an Intermediate System-Intermediate System (IS-IS) database into a BGP database and transfers I-SID and MAC information in the BGP database into the IS-IS database of the PE.

Claims

1. A method implemented in a multiprotocol label swapping (MPLS) edge switch (PE) for interworking the 802.1aq control plane with an Ethernet Virtual Private Network (EVPN) Border Gateway Protocol (BGP) control plane such that electing designated forwarders (DFs) for a given Backbone-Virtual Local Area Network Identifier (B-VID) in a local Provider Backbone Bridged Network (PBBN) determines which PE uniquely transfers specific I-Component Source Identifier (I-SID) and Media Access Control (MAC) information for the B-VID from an Intermediate System-Intermediate System (IS-IS) database into a BGP database and transfers I-SID and MAC information in the BGP database into the IS-IS database of the PE, the method comprising the steps of:

receiving an IS-IS protocol data unit (PDU) including an IS-IS Type Length Value (TLV) by the PE;

determining whether the received IS-IS PDU data requires a change in a configuration of DFs;

determining whether the PE is still a DF for one or more B-VIDs;

removing the DF associated network layer reachability information (NLRI) from the BGP database and remote NLRI sourced information for the DF from the IS-IS database, in response to the PE no longer being the DF; and

adding the DF associated NLRI to the BGP database from the IS-IS database and local DF associated remote shortest path bridging MAC mode (SPBM) sub tenants to the IS-IS database from the BGP database, in response to the PE becoming the DF for at least one B-VID.

2. The method of claim 1, further comprising the steps of:

determining whether the PE is the DF for any B-VID;

determining whether the IS-IS PDU contains new SPBM service identifier or unicast address sub-TLV change information; and

adding the change information as NLRI to the BGP database from the IS-IS database.

3. The method of claim 1, further comprising the steps of:

receiving BGP NLRI from a peer node;

determining whether the BGP NLRI contains new information;

determining whether the PE is the DF for an I-SID associated with the BGP NLRI; and

adding remote information from the BGP NLRI to the IS-IS database.

4. The method of claim 1, wherein determining whether the received IS-IS PDU data requires a change in a configuration of DFs further comprises:

determining whether a route distinguisher in the Ethernet Segment Identifier (ESI) has changed for a route target (RT).

5. The method of claim 1, further comprising the step of:

synchronizing the IS-IS database with peers of the PE after update of DF information.

6. The method of claim 1, further comprising the step of:

synchronizing the BGP database with peers of the PE after update of DF information.

7. The method of claim 1, further comprising the step of:

processing the IS-IS database to generate NLRI, in response to the PE becoming the DF for the B-VID.

8. The method of claim 1, further comprising the step of:

generating an updated set of SPBM service identifier and unicast address sub-TLVs to be advertised by the PE, in response to a first instance of registration of interest in the I-SID.

9. The method of claim 1, further comprising the step of:

receiving a frame from the EVPN;

removing MPLS information from the frame; and

updating a B-VID of the frame with a B-VID inferred from an MPLS label at the bottom of a label stack or by an I-SID lookup.

10. The method of claim 9, further comprising the steps of:

overwriting an organizationally unique identifier (OUI) field of the frame with an SP Source ID of the PE, where the frame has a multicast destination address B-MAC.

11. A multiprotocol label swapping (MPLS) edge switch (PE) for interworking the 802.1aq control plane with an Ethernet Virtual Private Network (EVPN) Border Gateway Protocol (BGP) control plane such that electing designated forwarders (DFs) for a given Backbone-Virtual Local Area Network Identifier (B-VID) in a local Provider Backbone Bridged Network (PBBN) determines which PE uniquely transfers specific I-Component Source Identifier (I-SID) and Media Access Control (MAC) information for the B-VID from an Intermediate System-Intermediate System (IS-IS) database into a BGP database and transfers I-SID and MAC information in the BGP database into the IS-IS database of the PE, the PE comprising:

a processor configured to execute a control plane interworking function, a IS-IS module and a BGP module,

the BGP module configured to manage the BGP database,

the IS-IS module configured to receive an IS-IS protocol data unit (PDU) including an IS-IS Type Length Value (TLV) and manage the IS-IS database,

the control plane interworking function configured to determine whether the received IS-IS PDU data requires a change in a configuration of DFs,to determine whether the PE is still a DF for one or more B-VIDs, to remove the DF associated network layer reachability information (NLRI) from the BGP database and remote NLRI sourced information for the DF from the IS-IS database, in response to the PE no longer being the DF, and to add the DF associated NLRI to the BGP database from the IS-IS database and local DF associated remote shortest path bridging MAC mode (SPBM) sub tenants to the IS-IS database from the BGP database, in response to the PE becoming the DF for at least one B-VID.

12. The PE of claim 11, wherein the control plane interworking function is further configured to determine whether the PE is the DF for any B-VID, to determine whether the IS-IS PDU contains new SPBM service identifier or unicast address sub-TLV change information, and to add the change information as NLRI to the BGP database from the IS-IS database.

13. The PE of claim 11, wherein the BGP module is further configured to receive BGP NLRI from a peer node, and

wherein the control plane interworking function is further configured to determine whether the BGP NLRI contains new information, to determine whether the PE is the DF for an I-SID associated with the BGP NLRI, and to add remote information from the BGP NLRI to the IS-IS database.

14. The PE of claim 11, wherein the control plane interworking function is further configured to determine whether the received IS-IS PDU data requires a change in a configuration of DFs by determining whether a route distinguisher in the Ethernet Segment Identifier (ESI) has changed for a route target (RT).

15. The PE of claim 11, wherein the control plane interworking function is further configured to synchronize the IS-IS database with peers of the PE after update of DF information.

16. The PE of claim 11, wherein the control plane interworking function is further configured to synchronize the BGP database with peers of the PE after update of DF information.

17. The PE of claim 11, wherein the control plane interworking function is further configured to process the IS-IS database to generate NLRI, in response to the PE becoming the DF for the B-VID.

18. The PE of claim 11, wherein the control plane interworking function is further configured to generate an updated set of SPBM service identifier and unicast address sub-TLVs to be advertised by the PE, in response to a first instance of registration of interest in the I-SID.

19. The PE of claim 11, wherein the control plane interworking function is further configured to receive a frame from the EVPN, remove MPLS information from the frame, and update a B-VID of the frame with a B-VID inferred from an MPLS label at the bottom of a label stack or by an I-SID lookup.

20. The PE of claim 19, wherein the control plane interworking function is further configured to overwrite an organizationally unique identifier (OUI) field of the frame with an SP Source ID of the PE, where the frame has a multicast destination address B-MAC.