HP 6125G HP 6125G & 6125G/XG Blade Switches IRF Configuration Guide-R2 - Page 12

BFD MAD, LACP MAD application scenario

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Figure 5 LACP MAD application scenario BFD MAD BFD MAD can work with or without intermediate devices. Figure 6 shows a typical BFD MAD application scenario. To use BFD MAD: • Set up 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 purpose. • Assign the ports connected by BFD MAD links to the same VLAN, create a VLAN interface for the VLAN, and assign a MAD IP address to each member on the VLAN interface. The MAD addresses identify the member switches and must belong to the same subnet. With BFD MAD, the master tries to establish BFD sessions with other member switches 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, and the master cannot establish a BFD session with any other member. 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, and the two 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. 8

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8
Figure 5
LACP MAD application scenario
BFD MAD
BFD MAD can work with or without intermediate devices.
Figure 6
shows a typical BFD MAD application
scenario.
To use BFD MAD:
•
Set up 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 purpose.
•
Assign the ports connected by BFD MAD links to the same VLAN, create a VLAN interface for the
VLAN, and assign a MAD IP address to each member on the VLAN interface.
The MAD addresses identify the member switches and must belong to the same subnet.
With BFD MAD, the master tries to establish BFD sessions with other member switches 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, and the master
cannot establish a BFD session with any other member. 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, and the
two 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
.