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So it’s not really the right way to go if you are forwarding VoIP or using any kind of stream on your network. If you have destinations that are available with single path at the end it will work fine for other situations Per-packet load balancing can reorder packets and affect performance of TCP stack. Router will use round-robin to send successive data packets over different links. It is fairly logical that Per-destination load balancing is default one because is ensuring that packets for a given host pair have the best chance to arrive in order which can not always be true with Per-Packet Load Balancing Traffic destined for different source-destination pairs tend to go across different paths.ĬEF is enabled by default on Cisco router so Per-destination load balancing is enabled by default to. Packets from one source destined towards same destination will always take the same path. Router will take packet source and destination IP to calculate the hash and use multiple paths to load share traffic. There are two methods of path selection, per-destination being default one: More about thatĬEF – Cisco Express Forwarding load balancing is by default using source and destination IP to calculate the hash and distribute traffic over multiple paths. That is, route-cache mechanisms, CEF in case of Cisco device will do load-share per session using source-destination IP. Routing table will then leave to the switching process the job of load-sharing. If both routes have the same destination prefix and no different Administrative Distance is configured, both routes will get installed in the routing table. The question was: Which link or which route will be used? And if the traffic will be load balanced, which mechanism will be used to share the traffic across both of links. The idea is to make two same static routes on the same router but with different next-hops. If you have two routers / two Layer3 switches connected with two 元 links (two paths) you can route with two equal static routes towards the same prefix and the router will load balance traffic across both links.
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