Deployment Guide

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17 Scaling VCF Domains Beyond a Single MX7000 Chassis | Document ID
Adding Member Chassis to MCM Group
6.3 Reconfiguring the Network Fabric
Reconfiguration of the network fabric from one to two chassis is carried out by redistributing the MX9116n
FSEs across the two chassis.
The only invasive reconfiguration of the network fabric occurs when the fabric is expanded from a single
chassis to more than one chassis. Adding additional chassis beyond the second chassis has no impact on
workloads already running.
The physical reconfiguration starts with moving one of the MX9116n FSEs to the second chassis and then
adding the appropriate FEMs. In this example The A2 FSE from the first chassis is moved to the A2 slot in the
second chassis. An MX7116n FEM is installed in the now empty A2 slot of the first chassis. Another MX7116n
is added to the second chassis and placed in the empty A1 slot. Cabling the FSEs to their respective FEMs is
made using 200GbE QSFP28-DD cables. A 200GbE connection provides a full 25GbE for each of the eight
possible compute facing ports of the FEMs. These should be cabled as follows:
• The A1 FEM in the second chassis is cabled to the A1 FSE in the first chassis
• The A2 FEM added to the first chassis is cabled to the A2 FSE moved to the second chassis
Figure 5 shows the network fabric configuration before and after the redistribution of the FSEs and the
addition of the FEMs. The A1 side of the fabric has its FSE in the first chassis and that the A2 side of the
fabric has its FSE in the second chassis.