D-Link DGS-6600-48TS Configuration Guide - Page 248
ECMP, Overview, An Introduction to ECMP, ECMP Overview
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Volume 4-ECMP / Chapter 24-ECMP Chapter Overview Chapter 24 ECMP Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to ECMP • ECMP Overview • Configuring ECMP An Introduction to ECMP Equal-cost multipath (ECMP) is a technique for routing packets along multiple paths of equal cost. If multiple equal-cost routes to the same destination exist, ECMP can be used to provide load balancing among the redundant paths. Since the forwarding logic has several next hops for any given destination, it must use some method to choose which next hop should be used for a given data packet.The ECMP support that allows the packet to be forwarded along one of 32 paths based on a CRC32 hashing of the following combinations: SIP SIP, DIP SIP, Port SIP, DIP, Port Use this tool to calculate the ECMP route load-balancing path. The algorithm may take some bits from source IP address directly. Or take some bits from a CRC32 calculation result which bases on source IP address and, optionally, the destination IP address or TCP/UDP port. User can use the tool to get which one is the selected path. If the return values are the same, it means the pattern switched over the same path. ECMP Overview The ECMP algorithm tool is built into the runtime firmware in the DGS-6600 switch. Use the command to calculation the result of ecmp algorithm path. This command is a hidden command, but, it can be executed in EXEC mode with privilege admin user (15) rights. DGS-6600 Configuration Guide 248
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