Default gateway redundancy support across SPB networks

A system comprising one or more processors configured to perform operations including:

• enabling peer network information exchange via routed split multi-link trunking (RSMLT) over shortest path bridging (SPB) including non-inter switch trunk (IST) links on a per-network basis between a plurality of switches in a shortest path bridging mac-in-mac network;
• advertising a first address and a second address from each switch in the plurality of switches to the other switches via RSMLT over SPB;
• storing, at each switch, the first address and the second address received from the other switches in the plurality of switches;
• and
• routing, at a first switch, traffic for a second switch when the first switch detects that the traffic can be routed more efficiently through the shortest path bridging mac-in-mac network without being sent to the second switch.

A nontransitory computer readable medium having stored thereon software instructions that, when executed by a processor of a wireless controller, cause the processor to perform operations including:

• enabling peer network information exchange via routed split multi-link trunking (RSMLT) over shortest path bridging (SPB) including non-inter switch trunk (IST) links on a per-network basis between a plurality of switches in a shortest path bridging mac-in-mac network;
• advertising a first address and a second address from each switch in the plurality of switches to the other switches via RSMLT over SPB;
• storing, at each switch, the first address and the second address received from the other switches in the plurality of switches;
• and
• routing, at a first switch, traffic for a second switch when the first switch detects that the traffic can be routed more efficiently through the shortest path bridging mac-in-mac network without being sent to the second switch.