Method and system for emulating a single router in a switch stack
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United States of America Patent
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Aug 23, 2005
Grant Date -
N/A
app pub date -
Nov 9, 1999
filing date -
Nov 9, 1999
priority date (Note) -
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Abstract
A system and method for emulating a single router in a switch stack is described. The switch stack is connected to virtual local area networks (VLANs) and comprises a number of stack devices that can include routing devices (RDs) having interfaces to the VLANs and non-routing devices (NRDs). All of the interfaces of the RDs share the same router and VLAN configuration addresses, including router Media Access Control addresses. One RD is appointed as a master in the switch stack and all other RDs use the configuration addresses of the master. Each NRD is owned by a corresponding routing device according to an ownership algorithm. The shared configuration addresses allow the switch stack to appear as a 'virtual router' to nodes belonging to VLANs connected to the switch stack.
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