Mad Mechanisms; Lacp Mad - HP FlexFabric 5700 series Configuration Manual

MAD mechanisms

IRF provides MAD mechanisms by extending LACP, ARP, and IPv6 ND.
IMPORTANT:
You can configure ARP MAD and ND MAD together in an IRF fabric for prompt IRF split detection.
However, do not configure any of these mechanisms together with LACP MAD, because they handle
collisions differently.
Table 1 compares the MAD mechanisms and their application scenarios.
Table 1 Comparison of MAD mechanisms
MAD
mechanism

LACP MAD

ARP MAD
ND MAD
LACP MAD
As shown in
Every IRF member must have a link with an intermediate device.
•
• All the links form a dynamic link aggregation group.
The intermediate device must be a device that supports extended LACP for MAD.
•
The IRF member devices send extended LACPDUs that convey a domain ID and an active ID. The
intermediate device transparently forwards the extended LACPDUs received from one member device to
all the other member devices.
Advantages
•
Detection speed is fast.
•
Does not require
MAD-dedicated physical
links or Layer 3 interfaces.
•
No intermediate device is
required.
•
Intermediate device, if used,
can come from any vendor.
•
Does not require MAD
dedicated ports.
•
No intermediate device is
required.
•
Intermediate device, if used,
can come from any vendor.
•
Does not require MAD
dedicated ports.
Figure 5, LACP MAD has the following requirements:
Disadvantages
Requires an intermediate
device that supports
extended LACP for MAD.
•
Detection speed is slower
than LACP MAD.
•
The spanning tree feature
must be enabled.
•
Detection speed is slower
than LACP MAD.
•
The spanning tree feature
must be enabled.
8
Application scenario
Link aggregation is used
between the IRF fabric
and its upstream or
downstream device.
For information about
LACP, see Layer 2—LAN
Switching Configuration
Guide.
Spanning tree-enabled
non-link aggregation IPv4
network scenario.
For information about
ARP, see Layer 3—IP
Services Configuration
Guide.
Spanning tree-enabled
non-link aggregation IPv6
network scenario.