Is this a valid design for the control and protected VLANs on the VSX fabric 1 switches?

Refer to the exhibit.

which shows the topology tot an Ethernet Ring Protection Switching (ERPS) solution.

Is this a valid design for the control and protected VLANs on the VSX fabric 1 switches?

Solution: Ring 1, Instance 1:

control VLAN: 51 protected VLANs: 51-100 Ring 1, Instance 2:

control VLAN: 51 protected VLANs: 101-150 Ring 2, Instance 1: control VLAN: 181

protected VLANs: 181-200 Ring 2, Instance 2: control VLAN: 181 protected VLANs:

201-220
A . Yes
B. No

View Answer

Answer: B

Explanation:

ERPS is a feature of ArubaOS-CX that prevents loops at layer 2 on ring networks1. ERPS uses a protocol called Ring Auto Protection Switching (RAPS) to detect link failures and perform fast traffic switchover1. ERPS supports multiple rings and multiple instances per ring1. Each instance has a control VLAN and one or more protected VLANs1. The control VLAN carries the RAPS PDUs and must be unique per ring1. The protected VLANs are the user traffic VLANs that are protected by ERPS and must be unique per instance1. Based on the exhibit, the design for the control and protected VLANs on the VSX fabric 1 switches is not valid. The control VLAN 51 is used for both instances 1 and 2 on ring 1, which violates the rule that the control VLAN must be unique per ring1. The protected VLANs 51-100 and 101-150 are also overlapping with the control VLAN 51, which violates the rule that the protected VLANs must be unique per instance1. Therefore, this is not a valid design for the control and protected VLANs on the VSX fabric 1 switches, and the correct Answer is no. For more information on ERPS and VLANs, refer to the Aruba Data Center Network Specialist (ADCNS) certification datasheet2 and the ERPS Guide for your switch model1.