Configuring Mad Detection - H3C S5120-EI Series Configuration Manual

When the IRF link changes from up to down, the port does not immediately report the change to the
•
IRF fabric. If the IRF link state is still down when the delay time is reached, the port reports the
change to the IRF fabric.
• When the IRF link changes from down to up, the link layer immediately reports the event to the IRF
fabric.
Follow these steps to set the IRF link down report delay:
To do...
Enter system view
Set the IRF link down report delay

Configuring MAD detection

You have the following MAD mechanisms for detecting multi-active collisions in different network
scenarios:
• LACP MAD
ARP MAD.
•
These MAD detection mechanisms operate independently, and you can configure all of tem for an IRF
fabric.
Configuring LACP MAD
LACP MAD detection mechanism
1.
With LACP MAD, an IRF member switch sends extended LACP data units (LACPDUs) with a type length
value (TLV) that conveys the domain ID and active ID of the IRF fabric for detecting an IRF split. The
domain ID uniquely identifies an IRF device in the network, and the active ID is identical to the member
ID of the master switch in the IRF fabric.
An IRF member switch compares the domain ID and the active ID in each received extended LACPDU
with its domain ID and active ID:
If the domain IDs are different, the extended LACPDU is from a different IRF fabric, and the switch
•
does not continue to process the extended LACPDU with the MAD mechanism.
If the domain IDs are the same, the switch compares the active IDs:
•
If the active IDs are different, the IRF fabric has split.
If the active IDs are the same, the IRF fabric is operating normally.
Network requirements
2.
Every IRF member switch has a link with an intermediate switch, and all these links form a dynamic link
aggregation group, as shown in
The intermediate switch must be an H3C switch capable of handling extended LACPDUs that carry the
Active ID field. For more information about LACP and the support of the switch for extended LACPDUs,
see Layer 2 — LAN Switching Configuration Guide.
Use the command...
system-view
irf link-delay interval
Figure 10.
18
Remarks
—
Optional
The function is disabled by default.
The recommended value range (in
milliseconds) is 200 to 500. The greater
the interval, the slower the service
recovery.