Dell PowerConnect 8100 CLI Reference Guide - Page 614
Enhanced LAG Hashing, Manual Aggregation of LAGs
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• Source/Destination IP and source/destination TCP/UDP Port fields of the packet. Enhanced LAG Hashing PowerConnect devices based on Broadcom XGS-IV silicon support configuration of hashing algorithms for each LAG interface. The hashing algorithm is used to distribute traffic load among the physical ports of the LAG while preserving the per-flow packet order. One limitation with earlier LAG hashing techniques is that the packet attributes were fixed for all type of packets. Also, there was no MODULO-N operation involved, which can result in poor load balancing performance. As part of Release 4.0, the LAG hashing support is extended to support an Enhanced hashing mode, which has the following advantages: • MODULO-N operation based on the number of ports in the LAG. • Packet attributes selection based on the packet type. For L2 packets, Source and Destination MAC address are used for hash computation. For IP packets, Source IP, Destination IP address, TCP/UDP ports are used. • Non-Unicast traffic and Unicast traffic is hashed using a common hash algorithm. • Excellent load balancing performance. Manual Aggregation of LAGs PowerConnect switching supports the manual addition and deletion of links to aggregates. In the manual configuration of aggregates, the ports send their Actor Information (LACPDUs) to the partner system in order to find a suitable Partner to form an aggregation. When the Partner System neglects to respond using LACPDUs, the PowerConnect switching aggregates manually. The PowerConnect switching uses the currently configured default Partner Values for Partner Information. 614 Port Channel Commands
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