Routed split multilink trunking
First Claim
Patent Images
1. A method comprising:
- interconnecting at least two aggregation devices by an Inter Switch Trunk (IST) link to logically operate as a single device, the at least two aggregation devices operating concurrently;
the at least two aggregation devices is routed split multilink trunking (RSMLT) enabled; and
synchronizing forwarding records of local routing instances for Internet Protocol (IP) networking between the at least two aggregation devices, the forwarding records are media access control (MAC) records, each of the MAC records includes an indication that, when set to a first logic level, allows routing of that MAC record over a port different than ports through which the forwarding records are exchanged between the at least two aggregation devices over the IST link and, when the indication bit is set to a second logic level, does not allow routing of that MAC record over the IST trunk.
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Abstract
In one embodiment, the invention relates to a method in which at least two aggregation devices, which logically operate as a single device, are interconnected by an Inter Switch Trunk (IST) link. Thereafter, forwarding records of local routing instances between the at least two aggregation devices are synchronized to enable one aggregation device to support data traffic for the other aggregation device if it has failed or a link to the aggregation device has failed.
253 Citations
17 Claims
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1. A method comprising:
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interconnecting at least two aggregation devices by an Inter Switch Trunk (IST) link to logically operate as a single device, the at least two aggregation devices operating concurrently;
the at least two aggregation devices is routed split multilink trunking (RSMLT) enabled; andsynchronizing forwarding records of local routing instances for Internet Protocol (IP) networking between the at least two aggregation devices, the forwarding records are media access control (MAC) records, each of the MAC records includes an indication that, when set to a first logic level, allows routing of that MAC record over a port different than ports through which the forwarding records are exchanged between the at least two aggregation devices over the IST link and, when the indication bit is set to a second logic level, does not allow routing of that MAC record over the IST trunk. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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an Inter Switch Trunk (IST) link; a first aggregation device coupled to the IST link, the first aggregation device comprises a first set of ports, first processing logic coupled to the first set of ports, and a first memory element coupled to the first processing logic, the first memory element including a routing table that comprises a first set of media access control (MAC) records, each MAC record of the first set of MAC records includes a routing bit that, when set to a first logical value, allows routing of that MAC record from the first set of ports over the IST link and when set to a second logical value, does not allow routing of that MAC record over the IST link; and a second aggregation device coupled to the IST link, the second aggregation device to obtain the first set of MAC records for use by one or more local routing instances for a Layer 3 (L3) networking protocol within the second aggregation device, wherein the first aggregation device and the second aggregation device are routed split multilink trunking (RSMLT) enabled. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An aggregation device in communication with an Inter Switch Trunk (IST) peer device, comprising:
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a control plane; at least one port; and a data plane in communication with the control plane, the data plane to provide sub-second failover recovery and provide control plane protocols enough time to converge without adversely affecting data forwarding operations through synchronization of media access control (MAC) records of local routing instances for Internet Protocol (IP) networking with the IST peer device, each MAC record of the MAC records includes a routing bit that, when set to a first logical value, allows routing of that MAC record from the at least one port and when set to a second logical value, does not allow routing of that MAC record from the at least one port, wherein both the aggregation device and the IST peer device are routed split multilink trunking (RSMLT) enabled.
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Specification