System and method for a virtual chassis system

• US 9,148,389 B2
• Filed: 11/12/2012
• Issued: 09/29/2015
• Est. Priority Date: 08/04/2010
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Santoso, Ignatius D., Jacob Da Silva, Roberto H., Chang, Chung-Hua, Wu, Shaofu, Bates, Stephen R., Bhattacharya, Surajit, Vinayagam, Anand, Kunnath, Nalinakshan, Page, Gregory G., Tolliver, Eric W., Ravenscroft, Christopher Francis, Larsen, Steve, Hanka, Stephen C.
• Primary Examiner(s): Park, Jung
• Application Number:
  US13/674,259
• Publication Number:
  US 20130077621A1
• Time in Patent Office: 1,051 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/245 Link aggregation, e.g. trunking
• CPC Class Codes: H04L 45/28 using route fault recovery
• CPC Class Codes: H04L 45/58 Association of routers
• CPC Class Codes: H04L 49/40 Constructional details, e.g. power supply, mechanical construction or backplane
• CPC Class Codes: H04L 49/552 by ensuring the integrity of packets received through redundant connections
• CPC Class Codes: H04L 49/70 Virtual switches

Abstract

A virtual chassis system includes a plurality of network nodes configured with a master virtual chassis address. The network nodes are connected by virtual fabric link (VFLs) that provide a connection for exchange of packets between the network nodes. The packets include source MAC addresses and associated hardware device information, such as source chassis ID, source network interface identifier and source port identifier information. The network nodes use this information to maintain synchronized MAC address tables for forwarding of packets in the virtual chassis system.

Claims

1. A network node in a virtual chassis system, comprising:

a plurality of virtual fabric links (VFLs) operably coupled between the network node and a plurality of other network nodes in the virtual chassis system;

a control management module operable to generate a topology database that includes a chassis identification and local address of a master network node in the virtual chassis system and chassis identifications and local addresses of the plurality of other network nodes in the virtual chassis system, the control management module operable to;

adopt the local address of the master network node in the virtual chassis system as a virtual chassis address of the network node for addressing of the virtual chassis system by external nodes; and

at least a first network interface module operable to;

store one or more address tables that include destination addresses associated with hardware device information of the plurality of other network nodes in the virtual chassis system;

receive an incoming packet on an external port interface, wherein the incoming packet includes a first destination address;

determine from the one or more address tables destination hardware device information of one of the plurality of other network nodes in the virtual chassis system associated with the first destination address, that includes access a first forwarding table having a list of destination address entries and associated hardware device information of the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address, wherein the associated hardware device information of the one of the plurality of other network nodes includes a chassis identification of the one of the plurality of other network nodes;

access a second address table that includes a list of chassis identifications and associated VFL identifiers, wherein the associated VFL identifiers identify at least one VFL for forwarding a packet to one of the plurality of other network nodes identified by the chassis identification;

generate a packet with pre-pended header from the incoming packet, wherein the pre-pended header includes the destination hardware device information of the one of the plurality of other network nodes in the virtual chassis system; and

transmit the packet with pre-pended header over one of the plurality of virtual fabric links to the one of the plurality of other network nodes in the virtual chassis system.

2. The network node of claim 1, wherein the at least a first network interface module is operable to:

determine from the second access table a VFL identifier associated with the chassis identification of the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address; and

transmit the packet with pre-pended header over the one of the plurality of virtual fabric links associated with the VFL identifier to the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address.

3. The network node of claim 2, wherein the first network interface module comprises:

a switching circuit that includes a plurality of external port interfaces, wherein the first network interface module receives the incoming packet on one of the plurality of external port interfaces; and

a queuing circuit that includes a queue management module.

4. The network node of claim 3, wherein the switching circuit further includes:

a pre-pended packet header interface (PPHI) operable to generate the packet with pre-pended header, wherein the pre-pended header includes the destination hardware device information.

5. A network node in virtual chassis system, comprising:

a plurality of virtual fabric links (VFLs) operably coupled between the network node and a plurality of other network nodes in the virtual chassis system;

a control management module operable to generate a topology database, wherein the topology database includes a chassis identification and local address of a master network node in the virtual chassis system and chassis identifications and local addresses of the plurality of other network nodes in the virtual chassis system, the control management module operable to;

adopt the local address of the master network node in the virtual chassis system as a virtual chassis address of the network node for addressing of the virtual chassis system by external nodes when the network node is operating in a virtual chassis mode; and

at least a first network interface module operable to;

receive a packet with a destination address from an external node;

access one or more forwarding tables to determine hardware device information of one of the plurality of other network nodes associated with the destination address, wherein the hardware device information includes a VFL identifier of at least one VFL coupled to the network node and the one of the plurality of other network nodes associated with the destination address; and

transmitting the packet over the at least one VFL coupled to the network node and the one of the plurality of other network nodes associated with the first destination address.

6. The network node of claim 5, wherein the control management module is further operable to:

initiate a first configuration module when the network node is operating in a virtual chassis mode; and

initiate a second configuration module when the network node is operating in a standalone mode.

7. The network node of claim 6, wherein the control management module is further operable to:

transition from a standalone mode to a virtual chassis mode by reconfiguring parameters of the hardware device information and initiating the first configuration module.

8. The network node of claim 5, wherein the control management module is further operable to:

receive a remote debug management command to redirect an output of a process in response to a debug function in the network node;

store a standard output descriptor of the process;

redirect the output of the process in response to the debug function to a selected destination; and

restore the standard output descriptor of the process.

9. A method for a network node in a virtual chassis system, wherein a plurality of virtual fabric links (VFLs) are operably coupled between the network node and a plurality of other network nodes in the virtual chassis system comprising:

generating a topology database that includes a chassis identification and local address of a master network node in the virtual chassis system and chassis identifications and local addresses of the plurality of the other network nodes in the virtual chassis system;

adopting the local address of the master network node as a virtual chassis address of the network node for addressing of the virtual chassis system be external nodes when the network node is operating in a virtual chassis mode;

storing one or more address tables that include destination addresses associated with hardware device information of a plurality of other network nodes in the virtual chassis system;

receiving an incoming packet on an external port interface, wherein the packet includes a first destination address;

determining from the one or more address tables destination hardware device information of one of the plurality of other network nodes in the virtual chassis system associated with the first destination address;

generating a packet with pre-pended header from the incoming packet, wherein the pre-pended header includes the destination hardware device information of the one of the plurality of other network nodes in the virtual chassis system; and

transmit the packet with pre-pended header over one of the plurality of virtual fabric links to the one of the plurality of other network nodes in the virtual chassis system.

10. The method of claim 9, wherein determining from the one or more address tables destination hardware device information includes:

accessing a first forwarding table, wherein the first forwarding table includes a list of destination address entries and associated hardware device information of one of the plurality of other network nodes in the virtual chassis system associated with the first destination address.

11. The method of claim 10, wherein the destination hardware device information of the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address includes a chassis identification of the one of the plurality of other network nodes.

12. The method of claim 11, further comprising:

accessing a second address table, wherein the second address table includes a list of chassis identifications and associated VFL identifiers, wherein the associated VFL identifiers identify at least one VFL for forwarding a packet to one of the plurality of other network nodes identified by the chassis identification.

13. The method of claim 12, further comprising:

determining from the second access table a VFL identifier associated with the chassis identification of the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address; and

transmitting the packet with pre-pended header over the one of the plurality of virtual fabric links associated with the VFL identifier to the one of the plurality of other network nodes in the virtual chassis system associated with the first destination address.