LACP-MAD Passthrough
Overview
Link Aggregation Control Protocol-Multi-Active Detection (LACP-MAD) is a detection mechanism deployed by
HPE Comware switches to recover from a breakup of the Intelligent Resilient Framework (IRF) stack due to link or
other failure.
LACP-MAD is implemented by sending extended LACP data units (LACPDUs) with a type length value (TLV) that
conveys the active ID of an IRF device. The active ID is identical to the member ID of the master and is thus
unique to the device. When LACP MAD detection is enabled, the members exchange their active IDs by sending
extended LACPDUs.
• When the IRF device operates normally, the active IDs in the extended LACPDUs sent by all members are the
same, indicating that there is no multiactive collision.
• When there is a breakup in the IRF chassis, the active IDs in the extended LACPDUs sent by the members in
different IRF devices are different, indicating that there are multiactive collisions.
LACP-MAD passthrough helps IRF-capable devices detect multiaccess and take corrective action. These devices
do not initiate transmission of LACP-MAD frames or participate in any MAD decision-making process. These
devices forward LACP-MAD TLVs received on one interface to the other interfaces on the trunk. LACP-MAD
passthrough can be enabled for 24 LACP trunks. By default, LACP-MAD passthrough is disabled.
NOTE:
This Appendix is applicable only if the customer is using a hybrid deployment of Comware
and ArubaOS-Switches.
LACP-MAD Passthrough commands
interface lacp
Syntax
[no] interface
<PORT-LIST>
lacp [mad-passthrough [enable|disable]|active|passive|key
<KEY>
]
Description
Defines whether LACP is enabled on a port, and whether it is in active or passive mode when enabled. When
LACP is enabled and active, the port sends LACP packets and listens to them. When LACP is enabled and
passive, the port sends LACP packets only if it is spoken to.
When LACP is disabled, the port ignores LACP packets. If the command is issued without a mode parameter,
'active' is assumed. During dynamic link aggregation using LACP, ports with the same key are aggregated as a
single trunk. MAD passthrough applies only to trunks and not to physical ports.
Parameters
mad-passthrough
Applies only to trunks and not to physical ports.
Appendix A
LACP-MAD Passthrough
750
Aruba 2930F / 2930M Management and Configuration Guide
for ArubaOS-Switch 16.08
