Fragmented packets of the same flow received on different NPM's interfaces are not supported X-Series

book

Article ID: 168230

calendar_today

Updated On:

Products

XOS NPM

Issue/Introduction

The X-series platform does not support fragments for the same flow being received on multiple NPMs. Receiving fragmented traffic on multiple interfaces will cause performance issues and/or packet loss.

Cause

Two issues might occur when the fragmented packets are received on multiple NPMs:
  • If fragmented packets for a same flow are received on multiple NPMs and the receiving circuits are configured with a same domain ID, the NPMs will reclassify the flow constantly, which will cause performance issues.
  • If the circuits are configured with different domain IDs, the packets¬†will be considered to belong to separate flows and thus the¬†packets reassembly will fail.

Resolution

To address this issue, reconfigure the upstream switches to transmit all packets for a given flow to a single NPM.