When both the me0 and vme interfaces are enabled simultaneously in a Virtual Chassis (VC) setup, unexpected behavior may occur, leading to management difficulties and connectivity issues.

Basic topology:

Switch1 (ge-x/x/x) <---> (vme)DUT

• When both me0 interface and vme are enabled, we are not able to directly ping from Switch to DUT.
• ARP entries for the DUT are visible on Switch1, but not on the DUT.
• Using the command monitor interface traffic, it is observed that packets are not reaching the vme interface; instead, they are flowing through the me0 interface.

Recommendation: It is recommended by Juniper not to enable both vme and me0 interfaces simultaneously in a VC setup to avoid these issues.

Additional Resources: For detailed vme configurations and troubleshooting steps, please refer to the following link:

• Troubleshooting the Virtual Chassis Management Ethernet Interface (VME)

•  Attempting to configure both interfaces (me0 and vme) simultaneously can lead to unexpected behavior and management difficulties.
• Unable to ping vme IP from directly connected device.

To maintain stable management and network operations, ensure that only one management interface (either me0 or vme) is enabled at any time in a Virtual Chassis environment.

Below commands for reference:

root@DUT> show configuration | display set | match "me0|vme"

set groups default interfaces me0 unit 0 family inet address 10.219.20.XXX/26

deactivate groups default interfaces me0

set interfaces vme unit 0 family inet address 10.219.20.XXX/26