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MAD BFD Configuration

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  • 1.  MAD BFD Configuration

    Posted Jan 10, 2023 01:58 AM
    Hi,

    I have two Core switches : 10508 Chassis, I can see the MAD BFD is enabled on them, but when I use the command display bfd session it shows as down, and I need your help to check if the configuration is correct or there is something missing.
    Please check output below, knowing that MAD vlan is vlan 1000.
    [FMC-Core]dis mad ver
    Current MAD status: Detect
    Excluded ports(configurable):
    Excluded ports(can not be configured):
    Ten-GigabitEthernet1/0/0/15
    Ten-GigabitEthernet1/0/0/16
    Ten-GigabitEthernet2/0/0/15
    Ten-GigabitEthernet2/0/0/16
    MAD LACP disabled.
    MAD BFD enabled interface:
    Vlan-interface1000
    mad ip address 10.10.10.1 255.255.255.252 member 1
    mad ip address 10.10.10.2 255.255.255.252 member 2
    ==================================================
    [FMC-Core]dis bfd session

    Total session number: 1 Up session number: 0 Init mode: Active

    IPv4 session working under Ctrl mode:

    LD/RD SourceAddr DestAddr State Holdtime Interface
    513/0 10.10.10.1 10.10.10.2 Down / Vlan1000
    ==================================================
    interface GigabitEthernet1/3/0/44
    port link-mode bridge
    description MAD
    port access vlan 1000
    stp disable
    #
    return
    [FMC-Core-GigabitEthernet1/3/0/44]inter g2/3/0/44
    [FMC-Core-GigabitEthernet2/3/0/44]dis this
    #
    interface GigabitEthernet2/3/0/44
    port link-mode bridge
    description MAD
    port access vlan 1000
    stp disable
    #


  • 2.  RE: MAD BFD Configuration
    Best Answer

    EMPLOYEE
    Posted Jan 10, 2023 03:01 AM
    Hi Samir,

    The MAD BFD is working, the status is 'Detect' which means that the IRF fabric is integrated. The BFD session is 'Down' and it is good. You don't want the MAD BFD session to go 'Up', believe me :)))

    It is explained in the guide:
    --------------------------------

    To use BFD MAD, configure a MAD IP address for each IRF member. Make sure all the MAD IP addresses are on the same subnet.

    Do not configure a MAD IP address by using the ip address command or configure a VRRP virtual address on the BFD MAD-enabled port or interface.

    The master attempts 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 takes effect. 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 partitioned 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.

    --------------------------------

    Hope it explains the situation!

    ------------------------------
    Ivan Bondar
    ------------------------------

    Original Message


  • 3.  RE: MAD BFD Configuration

    Posted Jan 10, 2023 05:30 AM
    Hi Ivan,

    thank you :)), I got your point....
    Original Message