1-21
Use this function to avoid unnecessary IRF virtual device partition and merge caused by frequent link
state changes of a port in a short time.
Follow these steps to set the delay time for the link layer to report a link-down event of an IRF virtual
device:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Set the delay time for the link
layer to report a link-down event
of an IRF virtual device
irf link-delay interval
Optional
The function is disabled by
default.
Do not set the time interval to a very long time; otherwise, the IRF virtual device cannot be aware of the
topology changes in time and thus the service will be recovered slowly.
Configuring MAD Detection
The S5820X and S5800 series switches support two MAD approaches: BFD MAD detection and LACP
MAD detection.
z
BFD MAD detection requires either direct connection or intermediate devices.
z
LACP MAD detection requires intermediate devices, which must be capable of identifying and
processing LACPDU protocol packets that carry Active ID values.
The two approaches operate independently and do not interfere with one another; therefore, you can
configure two MAD detection approaches for one IRF virtual device.
Configuring LACP MAD
LACP MAD detection mechanism
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 virtual device. The active ID is identical to the member ID of
the master and is thus unique to the IRF virtual device.
When LACP MAD detection is enabled, the members exchange their active IDs by sending extended
LACPDUs.
z
When the IRF virtual device operates normally, the active IDs in the extended LACPDUs sent by
all members are the same, indicating that there is no multi-active collision.
z
When the IRF virtual device partitions, the active IDs in the extended LACPDUs sent by the
members in different IRF virtual devices are different, indicating that there are multi-active
collisions.
Networking requirements
LACP MAD requires intermediate devices that are capable of identifying and processing extended
LACPDUs to carry the Active ID field. For more information, refer to the LACP protocol section in
Ethernet Link Aggregation
Configuration
of the
Layer 2 - LAN Switching Configuration Guide
. The
