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1-15 

Figure 1-7 Network diagram for BFD MAD detection 

 

 

LACP MAD requires intermediate devices that are capable of identifying and processing LACP data 

units (LACPDUs) extended to carry the Active ID field. 

 

BFD MAD detection is implemented through the BFD protocol. You need to enable BFD detection on a 

Layer 3 interface and configure the MAD IP address on the interface. A MAD IP address is different from 

a common IP address: a MAD IP address is bound to a member device; and all member devices in the 

IRF need their own MAD IP addresses, which are on the same network segment. However, only the 

MAD IP address on the master is effective, and the MAD IP addresses on the slaves are not effective. 

z 

When the IRF operates normally, only the MAD IP address of the master is effective and the BFD 

session is down. 

z 

When the IRF splits into two or multiple IRFs, all the MAD IP addresses of the masters in different 

IRFs are effective, the BFD session is activated, and multiple active IRFs are detected. 

Follow these steps to enable BFD MAD detection: 

Enter system view 

— 

Create a VLAN used for BFD 
MAD detection 

vlan vlan-id 

Required 

By default, only VLAN 1 is 
created. 

Quit system view 

— 

Enter VLAN interface view 

interface interface-type 
interface-number 

— 

Enable BFD MAD detection 

Required 

Disabled by default. 

Configure the MAD IP address 
for the Layer 3 interface on the 
specified member device 

mad ip address ip-address 
{ mask | mask-length } chassis 
chassis-number 

Required 

By default, no MAD IP 
address is configured for the 
interface. 

Quit system view 

—