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MAD

mechanism

Advantages Disadvantages Application scenario

ARP MAD

• No intermediate device is

required.

• Intermediate device, if used,

can come from any vendor.

• Does not require MAD

dedicated ports.

• Detection speed is slower

than BFD MAD.

• The spanning tree feature

must be enabled.

Spanning tree-enabled

non-link aggregation IPv4

network scenario.

For information about

ARP, see Layer 3—IP

Services Configuration

Guide.

ND MAD

• No intermediate device is

required.

• Intermediate device, if used,

can come from any vendor.

• Does not require MAD

dedicated ports.

• Detection speed is slower

than BFD MAD.

• The spanning tree feature

must be enabled.

Spanning tree-enabled

non-link aggregation IPv6

network scenario.

BFD MAD (centralized IRF devices)

BFD MAD can work with or without intermediate devices. Figure 7 shows a typical BFD MAD application

scenario.

To use BFD MAD:

• Set up a dedicated BFD MAD link between each pair of IRF members or between each IRF member

and the intermediate device. Do not use the BFD MAD links for any other purposes.

• Create a Layer 3 aggregate interface for BFD MAD, and assign a MAD IP address to each member

on the aggregate interface.

NOTE:

The MAD addresses identify the member devices and must belong to the same subnet.

• Assign the ports connected by BFD MAD links to the aggregation group for the Layer 3 aggregate

interface.

With BFD MAD, the master tries to establish BFD sessions with other member devices by using its MAD

IP address as the source IP address.

• If the IRF fabric is integrated, only the MAD IP address of the master is effective. The master cannot

establish a BFD session with any other members. If you execute the display bfd session command,

the state of the BFD sessions is Down.

• When the IRF fabric splits, the IP addresses of the masters in the split IRF fabrics take effect. The

masters can establish a BFD session. If you execute the display bfd session command, the state of

the BFD session between the two devices is Up.

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