HP Aruba JL253A Management And Configuration Manual page 707

For arubaos-switch 16.08

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fragment up. The other stack fragment is brought down (all switch ports are disabled). This prevents issues

caused by duplicate IP addresses and/or duplicate MAC address.

Figure 111: MAD interconnect device

NOTE: Once a MAD decision has been accepted and the active member is determined, the member

remains in the current state until the VSF fabric has been repaired.

LLDP-MAD is used to detect multiple-active VSF fragments. This protocol is not supported for more than 2–

member stacking switches. When a VSF fabric existing between an active and a standby member fails, LLDP-

MAD determines whether multiple active topology is in place. If LLDP-MAD is configured and a VSF split occurs,

one of the VSF members will become inactive, which disables the non-VSF frontplane ports. This ensures that

only one of the members will be actively forwarding traffic.

Figure 112: LLDP-MAD

MAD readiness check

The MAD assist device must be connected over a LACP trunk interface to the VSF device. Once you configure

the IP address of a MAD assist device, the VSF switch will perform a MAD readiness check to determine:

If the MAD assist device is reachable.

If a trunk interface is used to reach the device.

If the trunk state is up.

If the above three conditions are not met, MAD will fail to detect dual active fragments during a VSF split. This

error will create a log message.

Chapter 20 Virtual Switching Framework (VSF)

MAD interconnect device

Troubleshooting