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Knowledge Base

FAQ-What Is the Number of Users Supported by the L2TP Applications on AR Series Routers

Publication Date:  2012-07-27  |   Views:  2  |   Downloads:  0  |   Author:  SU1001733474  |   Document ID:  EKB0000375055


Issue Description

What is the number of users supported by the L2TP applications on AR series routers? 

Alarm Information


Handling Process

1. An AR router is a central forwarding architecture, with only one CPU and one memory module. All the applications share memory. When another application, such as NAT and a routing protocol, occupies much memory, memory available for L2TP is reduced, and and so on. Therefore, there is no specification on the number of L2TP users supported by an AR router.
2. An L2TP user occupies one piece of memory. Therefore, the number of L2TP users is closely related to memory size (Determining a memory size from a device model is difficult. It is recommended to let the customer use the disp version command to display memory size). Note that the following data is experience value. It is recommended that no specific value be revealed to a customer. Ambiguous replies can be given after the consent of the leader of the representative office is obtained. Alternatively, ask the customer how many users need to be online at the same time before considering a reply.
32 MB memory module About 20
64 MB memory module About 100
128 MB memory module About 200
256 MB memory module (AR46 RPU) About 500
512 MB memory module (AR46 ERPU) About 1024
3. When the number of L2TP users supported on the customer’s running network is smaller than the experience value, confirm whether any other application, such as NAT and a dynamic routing protocol, occupies much memory. This can be determined by observing memory utilization. The safety value of memory utilization is generally below 70%. If memory utilization is higher than 70%, route flaps cannot be handled. 

Root Cause