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Packet Switching

Per packet vs Per destination load balancing

Per packet load balancing: This method allows traffic distribution on a round robin fashion as stated in the previous post, this means that With per-packet load balancing enabled, the router sends one packet for destinationA over the first path, the second packet for the same destination over the second path, and so on. Per packet load balancing is used to avoid path congestion and for insuring equal utilization for all paths to the same destination. However it may result in out-of-order packets in the data stream which may introduce some problems to sensitive applications like voice or video. This method …

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Load balancing in a nutshell

Load balancing is the action of distributing traffic over multiple paths. The router automatically load balances traffic if it has multiple routes to the same destination in the routing table. RIP, OSPF and ISIS supports only equal cost load balancing, this means that in order to install multiple routes in the routing table they must have the same metric. EIGRP and EBGP support unequal cost load balancing. The command maximum-paths defines how many paths can concurrently exist for the same prefix in the routing table. To disable load balancing issue the command maximum-paths 1. Load balancing can be on per …

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The ip route-cache command – Bury the hatchet series

From what I’ve seen in the practical life, this command puzzles many people, i hope to cover it throughly. Controlling the packet switching method depends upon which method we are talking about, in the case of CEF Switching its all about the ingress interface and has nothing to do with the egress interface, accordingly despite the configuration under the egress interface, if the ingress interface was CEF enabled then the traffic will be CEF Switched (the packet will be handled via an interrupt routine rather than the IP Input process). While in the case of Fast Switching the IOS builds …

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