Providing Utmost Visibility to the Probes by Dynamically Filtering Subscribers Traffic (6.1)

Introduction

Tool over subscription is a common challenge in the network of service providers. To reduce this, the sampling rate of the subscribers traffic can be fixed. However, this may impact the traffic monitoring in the network. Gigamon's subscriber-aware filtering solution supports rotating the sampling window for a given sampling rate to provide the utmost visibility and at the same time, reduces the blind spots. This GVD illustrates deploying such a solution. You can refer to Improving tools performance by sampling subscribers traffic (5.9) for deploying the vanilla sampling.

Design Topology

Design Overview

This design illustrates deploying Gigamon's Subscriber-Aware filtering solution in a service provider's mobile core network that has a Gigamon device deployed as a standalone node at a site. Control plane traffic tapped from interfaces S11 and S5/S8 and User plane traffic tapped from interfaces S1U and S5/S8 is fed to the Gigamon device for GTP correlation. The device samples subscribers' traffic at 30% rate and also load-balances between the probes. The device is also enabled with rotational sampling to help sample subscriber traffic by IMSI. Subscribers (IMSI) are rotated dynamically based on interval and offset. Over a period of time, most of the subscribers will be sampled and forwarded to the probes for inspection.

In this scenario, rotational sampling has been configured with an interval of 15 mins and an offset of 10% so that every 15 mins, subscribers will be rotated based on offset. This helps in managing subscriber traffic and allows more new subscribers in the sampling bucket.

 

To learn more about this solution, read complete details on the Gigamon Community: Providing-Utmost-Visibility-to-the-Probes-by-Dynamically-Filtering-Subscribers-Traffic-6-1