21
Restrictions and guidelines
BFD MAD VLAN
• On the intermediate device, create a VLAN for BFD MAD, and assign the
ports used for BFD MAD to the VLAN. On the IRF fabric, you do not need
to assign the management Ethernet ports to the VLAN.
• Make sure the IRF fabrics on the network use different BFD MAD
VLANs.
• Make sure the BFD MAD VLAN on the intermediate device contains only
ports on the BFD MAD links.
MAD IP address
• Use the
command instead of the
command to configure MAD IP addresses on the BFD MAD-enabled
management Ethernet ports.
• Make sure all the MAD IP addresses are on the same subnet.
When you configure BFD MAD on a Layer 3 aggregate interface, follow these restrictions and
guidelines:
Restrictions and guidelines
BFD MAD-enabled Layer 3
aggregate interface
• Make sure the Layer 3 aggregate interface operates in static
aggregation mode.
• Make sure the
member ports in the aggregation group do not exceed the
maximum number of Selected ports allowed for an aggregation group. If
the number of member ports exceeds the maximum number of Selected
ports, some member ports cannot become Selected. BFD MAD will be
unable to work correctly and its state will change to Faulty.
BFD MAD VLAN
• On the intermediate device (if any), assign the ports on the BFD MAD
links to the same VLAN. Do not assign the ports to an aggregate
interface. If the ports are hybrid ports, make sure these ports are
untagged members of their PVIDs.
• If the intermediate device acts as a BFD MAD intermediate device for
multiple IRF fabrics, assign different BFD MAD VLANs to the IRF fabrics.
• Do not use the BFD MAD VLAN on the intermediate device for any
purposes other than BFD MAD.
• Make sure the BFD MAD VLAN on the intermediate device contains only
ports on the BFD MAD links. Exclude a port from the BFD MAD VLAN if
that port is not on a BFD MAD link. If you have assigned that port to all
VLANs by using the
port trunk permit vlan all command,
use the undo port trunk permit command to exclude that port
from the BFD MAD VLAN.
BFD MAD-enabled Layer 3
aggregate interface and
feature compatibility
Use only the
and
commands on
the BFD MAD-enabled interface. If you configure other features, both BFD
MAD and other features on the interface might run incorrectly.
MAD IP address
• To avoid problems, only use the
configure IP addresses on the BFD MAD-
enabled interface. Do not
configure an IP address by using the ip address
configure a VRRP virtual address on the BFD MAD-enabled interface.
• Make sure all the MAD IP addresses are on the same subnet.
Examples
# Enable BFD MAD on VLAN-interface 3.
<Sysname> system-view
[Sysname] interface vlan-interface 3
[Sysname-Vlan-interface3] mad bfd enable
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