PE device and method for advertising information about PE device

• US 10,461,998 B2
• Filed: 12/29/2015
• Issued: 10/29/2019
• Est. Priority Date: 06/29/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Li, Zhenbin
• Primary Examiner(s): Asres, Hermon
• Application Number:
  US14/983,153
• Publication Number:
  US 20160112255A1
• Time in Patent Office: 1,400 Days
• Field of Search: 709220
• CPC Class Codes: H04L 12/1886 with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
• 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 12/4675 Dynamic sharing of VLAN information amongst network nodes configuration of the network or of network elements H04L41/08
• CPC Class Codes: H04L 41/0803 Configuration setting
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 45/033 by updating distance vector protocols
• CPC Class Codes: H04L 45/48 Routing tree calculation
• CPC Class Codes: H04L 45/488 using root node determination
• CPC Class Codes: H04L 45/66 Layer 2 routing, e.g. in Ethernet based MAN's

Abstract

Embodiments of the present application disclose a method for advertising information about a PE device and a related apparatus, which are applied to a BGP-based MVPN. The method includes: a PE device in the MVPN determines a role of the PE device in the MVPN and a working status corresponding to the role, where the role is a root node and/or a leaf node, and the working status is active or standby; the PE device generates a BGP update message, carrying an IP address of the PE device, an identifier of the MVPN, the role of the PE device, and the working status of the PE device; and the PE device sends the BGP update message to a BGP neighbor of the PE device in the MVPN. The method and apparatus may alleviate a configuration workload and reduce an error occurrence during an application of a BGP-based MVPN.

Claims

1. A method for advertising information about a first provider edge (PE) device in a Border Gateway Protocol-based multicast virtual private network (BGP-based MVPN), the method comprising:

receiving, by the first PE device, configuration information describing a role and a working status of the first PE device as a node in the BGP-based MVPN that supports point-to-multipoint tunneling among nodes forming the BGP-based MVPN;

generating, by the first PE device, a BGP update message, including network layer reachability information (NLRI) comprising an IP address of the first PE device, an identifier of the BGP-based MVPN, and the role of the first PE device and working status of the first PE device,

wherein the role of the first PE device in the BGP-based MVPN is at least one of a root node and a leaf node, and the working status is either active or standby;

determining, by the first PE device, an IP address of an active leaf node in the BGP-based MVPN that is protected by the first PE device when the role of the first PE device is the leaf node and the working status of the first PE device is standby; and

sending, by the first PE device, the BGP update message in the BGP-based MVPN in a first or second manner, depending on whether the role of the first PE device is a root or leaf node in the BGP-based MVPN,

wherein the first manner includes sending the BGP update message without prompting by another node in the BGP-based MVPN and the second manner includes sending the BGP message after receiving a message from an active root node in the BGP-based MVPN,

wherein the BGP update message is sent in the first manner and comprises the IP address of the active leaf node when the first PE device determines that the role of the first PE device is the leaf node and the working status of the first PE device is standby, and

wherein sending the BGP update message in the first manner comprises (a) first information indicating that the BGP update message carries the role of the first PE device and the working status of the first PE device, (b) a route distinguisher (RD) of an instance of the BGP-based MVPN on the first PE device, and (c) the RD is used as the identifier of the BGP-based MVPN.

2. The method according to claim 1 further comprises:

determining, by the first PE device, an IP address of a second PE device when (a) the second node is an active root node in the BGP-based MVPN protected by the first PE device the (b) first PE device determines it is a root node whose working status is standby; and

sending the BGP update message in the second manner, wherein the BGP update message comprises an IP address of the second PE device.

3. The method according to claim 1 further comprises:

determining, by the first PE device, the role of the first PE device is a leaf node in the BGP-based MVPN and its working status is standby,

determining, by the first PE device, the IP address of an active leaf node in the BGP-based MVPN protected by the first PE device, wherein the BGP update message includes second information including the IP address of the active leaf node protected by the first PE device and the BGP update message is sent in the first manner.

4. The method according to claim 1, wherein receiving the message from the active root node in the BGP-based MVPN before sending the BGP update message in the second manner comprises:

receiving, by the first PE device, the message that carries an S-P-multicast service interface tunnel auto-discovery (S-PMSI A-D) route,

wherein the BGP update message is sent in the second manner and in response to the message carrying the S-PMSI A-D route, and the BGP update message comprises information indicating that (a) the role of the first PE device is the leaf node, and (b) the working status of the first PE device.

10. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of claim 1.

11. The non-transitory computer-readable storage medium according to claim 10 further comprises:

(a) determining the role of the first PE device is a root node in the BGP-based MVPN whose working status is standby, (b) determining an IP address of an active root node in the BGP-based MVPN protected by the first PE device, and (c) sending the BGP update message in the second manner, wherein the BGP update message comprises an IP address of the active root node;

or

(a) determining the role of the first PE device is a leaf node in the BGP-based MVPN whose working status is standby, (b) determining the IP address of an active leaf node in the BGP-based MVPN protected by the first PE device, and (c) sending the BGP update message in the second manner, wherein the BGP update message comprises an IP address of the active leaf node.

12. The non-transitory computer-readable storage medium according to claim 10, wherein receiving the message from the active node in the BGP-based MVPN before sending the BGP update message in the second manner comprises:

receiving, by the first PE device, the message that carries an S-P-multicast service interface tunnel auto-discovery (S-PMSI A-D) route,

wherein the BGP update message is sent in the second manner and in response to the message carrying the S-PMSI A-D route, and the BGP update message comprises information indicating that (a) the role of the first PE device is the leaf node, and (b) the working status of the first PE device.

5. A first provider edge (PE) device applied to a Border Gateway Protocol-based multicast virtual private network (BGP-based MVPN), the PE device comprising:

a processor configured to provide at least the following operations for advertising information about the first PE device;

receive configuration information describing a role and a working status of the first PE device as a node in the BGP-based MVPN that provides point-to-multipoint tunneling among nodes forming the BGP-based MVPN; and

generate a BGP update message includes network layer reachability information (NLRI) comprising an IP address of the first PE device, an identifier of the BGP-based MVPN, and the role and working status of the first PE device, wherein the role of the first PE device in the BGP-based MVPN is at least one of a root node and a leaf node, and the working status is either active or standby;

determining an IP address of an active leaf node in the BGP-based MVPN that is protected by the first PE device when the role of the first PE device is the leaf node and the working status of the first PE device is standby; and

a network interface configured to cooperate with the processor to send the BGP update message in the BGP-based MVPN in a first or second manner, depending on whether the role of the first PE device is a root or leaf node in the BGP-based MVPN,

wherein the first manner includes sending the BGP update message without prompting by another node in the BGP-based MVPN and the second manner includes sending the BGP message after receiving a message from an active root node in the BGP-based MVPN,

wherein the BGP update message is sent in the first manner and comprises the IP address of the active leaf node when the role of the first PE device is the leaf node and the working status of the first PE device is standby, and

wherein sending the BGP update message in the first manner comprises (a) first information indicating that the BGP update message carries the role of the first PE device and the working status of the first PE device, (b) a route distinguisher (RD) of an instance of the BGP-based MVPN on the first PE device, and (c) the RD is used as the identifier of the BGP-based MVPN.

6. The first PE device according to claim 5, wherein the processor is further configured to provide the following operations:

determine an IP address of a second PE device when (a) the second node is an active root node in the BGP-based MVPN protected by the first PE device the (b) first PE device determines it is a root node whose working status is standby; and

send the BGP update message in the second manner, wherein the BGP update message comprises an IP address of the second PE device.

7. The first PE device according to claim 5, further comprising:

a receiver configured to cooperate with the processor to receive a message from the active root node of the BGP-based MVPN that carries an S-P-multicast service interface tunnel auto-discovery (S-PMSI A-D) route,

wherein the BGP update message is sent in the second manner and in response to the message carrying the S-PMSIA-D route, and comprises information indicating that the role of the first PE device is the leaf node, and the working status of the first PE device.

8. The first PE device according to claim 7, where the processor is further configured to:

when the processor determines that the role of the first PE device is the leaf node and the working status of the first PE device is standby, determine an IP address of an active leaf node in the BGP-based MVPN that is protected by the first PE device and the BGP update message is sent in the first manner and further comprises the IP address of the active leaf node.

9. A first provider edge (PE) device in a Border Gateway Protocol-based multicast virtual private network (BGP-based MVPN), the PE device comprising:

a non-transitory memory comprising executable instructions; and

a processor in communication with the memory, wherein when the processor executes the instructions, the processor is configured to provide at least the following operations for advertising information about the first PE device;

receive configuration information describing a role and a working status of the first PE device as a node in the BGP-based MVPN that provides point-to-multipoint tunneling among nodes forming the BGP-based MVPN;

generate a BGP update message that includes network layer reachability information (NLRI) comprising an IP address of the first PE device, an identifier of the BGP-based MVPN, and the role and working status of the first PE device, wherein the role of the first PE device in the BGP-based MVPN is at least one of a root node and a leaf node, and the working status is either active or standby;

determining an IP address of an active leaf node in the BGP-based MVPN that is protected by the first PE device when the role of the first PE device is the leaf node and the working status of the first PE device is standby; and

send the BGP update message in the BGP-based MVPN in a first or second manner, depending on whether the role of the first PE device is a root or leaf node in the BGP-based MVPN,

wherein the first manner includes sending the BGP update message without prompting by another node in the BGP-based MVPN and the second manner includes sending the BGP message after receiving a message from an active root node in the BGP-based MVPN,

wherein the BGP update message is sent in the first manner and comprises the IP address of the active leaf node when the role of the first PE device is the leaf node and the working status of the first PE device is standby, and

wherein sending the BGP update message in the first manner comprises (a) first information indicating that the BGP update message carries the role of the first PE device and the working status of the first PE device, (b) a route distinguisher (RD) of an instance of the BGP-based MVPN on the first PE device, and (c) the RD is used as the identifier of the BGP-based MVPN.

13. The first provider edge (PE) device according to claim 9, wherein the processor is further configured to:

determine an IP address of a second PE device when (a) the second node is an active root node in the BGP-based MVPN protected by the first PE device and the (b) first PE device determines it is a root node whose working status is standby; and

send the BGP update message in the second manner, wherein the BGP update message comprises an IP address of the second PE device;

or

determine the role of the first PE device is a leaf node in the BGP-based MVPN and its working status is standby; and

determine an IP address of an active leaf node in the BGP-based MVPN protected by the first PE device, wherein the BGP update message (a) includes second information that includes the IP address of the active leaf node protected by the first PE device and (b) is sent in the second manner.

14. The first provider edge (PE) device according to claim 9, wherein the processor is further configured to:

receive the message from the active node in the BGP-based MVPN before sending the BGP update message in the second manner comprises;

receive the message that carries an S-P-multicast service interface tunnel auto-discovery (S-PMSI A-D) route, wherein the BGP update message is sent in the second manner and in response to the message carrying the S-PMSI A-D route, and the BGP update message comprises information indicating that (a) the role of the first PE device is the leaf node, and (b) the working status of the first PE device.