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OmniSwitch Troubleshooting Guide September 2005 page -1
A OS6600/OS7700/OS8800
Architecture Overview
The switch benefits from an intelligent, multi-layer switching, fully distributed and passive backplane
architectural design that provides redundancy of critical hardware and software elements for a continuous
(non-stop) traffic processing in any network conditions without a single point of failure. Switch process-
ing scheme includes a non-blocking store-and-forward crossbar design switching fabric with a distributed
processing. The architecture supports a true redundancy of management and the switch fabric. The
OmniSwitch 7000 new and highly intelligent design encompasses advanced distributed architecture
including state-of-the-art ASICs.
The architecture is designed around three major ASICs named the Catalina, the Coronado and the
Nantucket.
In This Chapter
“The MAC ASIC” on page -2
“Queue Driver Interaction” on page -8
“Link Aggregation” on page -11
“Coronado Tables” on page -11
“Source Learning” on page -12
“Hardware Routing Engine (HRE)” on page -13
“QoS/Policy Manager” on page -15
“Coronado Egress Logic” on page -15
“The Fabric Architecture” on page -16
“Nantucket ASIC” on page -17
“Roma” on page -22
“Chassis Management Module (CMM)” on page -26
“Packet Walk” on page -34
“Specific Packet Flows” on page -35
“Unknown Destination” on page -36
“OS6624/6648 Architecture” on page -43
“CMM Functionality for OS6600” on page -54
“OS6600 IPC Communication” on page -58
“OS6600 BOOT Sequence” on page -59