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Knowledge Base

NE16E/08E/05: Load Balancing Resulting in Lower Speed in Internet Access

Publication Date:  2012-07-27  |   Views:  116  |   Downloads:  0  |   Author:  Zhang Zhifeng  |   Document ID:  EKB0000008699


Issue Description

After load balancing is applied on the NE16E/08E/05, the subscribers connected to the device might find the speed at which they access the Internet is lower.

Handling Process

According to the above analysis, the slower speed Due to packet-based load sharing is not related to devices. You can configure only one uplink route and all traffic flows default to pass this interface. For the datagrams that require load sharing, you can configure another uplink interface through policy routing and simulate the stream-based load sharing.

Root Cause

The load balancing on the NE16E/08E/05 is based on packets, that is, data streams flowing between one pair of source/destination IP addresses are distributed evenly. For example, two uplink interfaces share the load to send ten datagrams to the same destination alternatively. So each interface sends five datagrams. However, the two links may select different routes to get to the destination, and thus the datagrams might reach the destination out of order. Almost all applications are sensitive packet sequence, so subscribers will feel the speed at which they access the Internet or download files through FTP is slower.