20
Usage guidelines
BFD MAD uses the BFD protocol to detect multi-active collisions. This MAD mechanism can work with or
without intermediate devices.
You can use BFD MAD with ARP MAD and ND MAD, but not with LACP MAD.
When you configure BFD MAD on a VLAN interface, follow these guidelines:
Category Restrictions
and
guidelines
BFD MAD VLAN
•
Do not enable BFD MAD on VLAN-interface 1.
•
If you are using an intermediate device, assign the ports of BFD MAD links to
the BFD MAD VLAN on the device.
•
Make sure the IRF fabrics on the network use different BFD MAD VLANs.
•
For correct traffic forwarding, make sure the BFD MAD VLAN contains only
ports on the BFD MAD links. Exclude a port from the BFD MAD VLAN if the
port is not on the BFD MAD link. For example, if you have assigned the port
to all VLANs by using the
port trunk permit vlan all
command, use the
undo
port trunk permit
command to exclude the port from the BFD MAD VLAN.
BFD MAD VLAN and feature
compatibility
Do not use the BFD MAD VLAN for any purposes other than configuring BFD
MAD.
•
Configure only the
mad bfd enable
and
mad ip address
commands on the
VLAN interface used for BFD MAD. If you configure other features, both BFD
MAD and other features on the interface might run incorrectly.
•
Disable the spanning tree feature on all Layer 2 Ethernet ports in the BFD
MAD VLAN. The MAD function is mutually exclusive with the spanning tree
feature.
MAD IP address
•
Use the
mad ip address
command instead of the
ip address
command to
configure MAD IP addresses on the BFD MAD-enabled VLAN interface.
•
Make sure all the MAD IP addresses on the BFD MAD-enabled VLAN
interface 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
mad enable
Use
mad enable
to enable LACP MAD.
Use
undo mad enable
to disable LACP MAD.
Syntax
mad enable
undo mad enable
Default
LACP MAD is disabled.
