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Link Aggregation
OmniSwitch Troubleshooting Guide September 2005 page -11
Link Aggregation
Link Aggregation feature allows software to aggregate a set of ports (not necessarily contiguous or on the
same Coronado) into a group. Each port is referred to as a channel that can carry some bandwidth. This
feature requires that all the queues associated with all the ports in the group to be contiguous. Events
resulting in Link Aggregation and Q driver interaction may be for the creation and deletion of link aggre-
gation group.
Coronado Tables
Coronado maintains two different kinds of tables:
• Layer 2 Tables
• Layer 3 Tables
Layer 2 Tables
• 64,000 pseudo CAM entries are split in 2 tables:
• L2-Source Address (L2-SA) Table containing
• VLAN membership (GID)
• Value (MAC address)
• 2-L2-Destination Address (L2-DA) Table containing
• VLAN Membership (GID)
• Value (MAC address)
• Destination Queues to use (QID/ReQID)
• Priority Description Index (PDI) containing Internal Priority
• Request for additional L3/L4 lookup and use of resultant QID
Layer 3 Tables
• 64,000 pseudo CAM entries. A single table is maintained for all the Source and Destination L3
addresses. Entries are based on selected lookup mode.
• Now, the primary functions and the architecture of Source Learning, Hardware Routing Engine (HRE)
and QOS functional blocks will be discussed.