H3C S9500E Series Configuration Manual page 37

To do...
to the VLAN
dedicated
BFD MAD
detection
Return to system view
Enter VLAN interface view
Enable BFD MAD
Configure a MAD IP address for
the VLAN
specified member
NOTE:
The VLAN enabled with BFD MAD detection must be dedicated to the BFD MAD detection and cannot
•
be configured with any other service.
• A VLAN interface enabled with BFD MAD detection and the interfaces of this VLAN do not support any
Layer 2 and Layer 3 protocol applications, including ARP and LACP.
If the VLAN dedicated to BFD MAD detection contains a trunk port that permits the packets of multiple
•
VLANs, make sure that the default VLAN of the trunk port is not the VLAN dedicated to BFD MAD
detection. Otherwise, services configured on the trunk port may be affected.
You cannot enable BFD MAD detection on VLAN-interface 1.
•
The MAD function is mutually exclusive with the VPN. Layer 3 interfaces that have BFD MAD enabled
•
cannot be bound to the VPN.
Do not enable the spanning tree function on any port in a BFD MAD VLAN. The MAD function is
•
mutually exclusive with the spanning tree function.
You can assign the MAD IP address to an interface used for BFD MAD detection only with the mad ip
•
address command. You cannot configure other IP addresses for it. This includes common IP address or
VRRP virtual IP address configured with the ip address command.
Configuring ARP MAD
ARP MAD detection mechanism
1.
With ARP MAD, an IRF member switch sends extended gratuitous ARP packets that convey the domain
ID and active ID of the IRF fabric for detecting an IRF split. The domain ID uniquely identifies an IRF fabric
in the network, and the active ID is identical to the member ID of the master switch in the IRF fabric.
An IRF member switch compares the domain ID and the active ID in each received extended gratuitous
ARP packet with its domain ID and active ID:
If the domain IDs are different, the extended gratuitous ARP packet is from a different IRF fabric, and
•
the switch does not continue to process the packet with the MAD mechanism.
Use the command...
Trunk port port trunk permit vlan vlan-id
to
Hybrid port port hybrid vlan vlan-id
quit
interface
interface-number
mad bfd enable
mad ip address ip-address { mask |
interface on the
mask-length } member member-id
vlan-interface
29
Remarks
You can select one approach
according to the port type.
BFD MAD detection has no
requirement on the link type of
the detection port, and you do
not need to modify the current
link type.
By default, the port is an access
port.
—
—
Required
Disabled by default.
Required
By default, no MAD IP address is
configured for any interface.