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If you do not use an intermediate device, verify that each pair of member chassis has a
dedicated BFD MAD link.
If you use an intermediate device, verify that each member chassis has a dedicated BFD
MAD link with the intermediate device.
2.
Verify that all physical ports used for BFD MAD are up:
a.
Execute the
display interface
command.
b.
Check the
current state
field in the command output:
−
If the field displays
DOWN ( Administratively )
for a port, execute the
undo shutdown
command to bring up the port.
−
If the field displays
DOWN
for a port, check the physical link for a link failure.
3.
Verify that the BFD MAD VLAN interface is configured correctly:
a.
Execute the
display mad verbose
command.
b.
Check the
MAD BFD enabled interface
field to verify that VLAN-interface 1 is not used for
BFD MAD.
c.
If VLAN-interface 1 is used for BFD MAD, disable BFD MAD on VLAN-interface 1, and then
enable BFD MAD on another VLAN interface.
d.
Verify that the BFD MAD-enabled VLAN interface does not have any other features,
including VPN.
e.
Execute the
display interface
command to verify that the interface does not have the
following IP addresses:
−
IP address assigned by using the
ip address
command.
−
VRRP virtual IP address.
4.
Verify that the BFD MAD VLAN and physical ports in the VLAN are configured correctly:
a.
Execute the
display vlan
command to verify the following items:
−
The BFD VLAN contains all physical ports used for BFD MAD.
−
The BFD VLAN does not contain physical ports that are not used for BFD MAD.
If an intermediate device is used, you must also perform this step on the intermediate
device.
b.
Execute the
display interface
command to verify that the physical ports in the BFD
VLAN are not configured with any features.
For BFD MAD to operate correctly, you must disable all features on the physical ports in the
BFD MAD VLAN, including the spanning tree feature, ARP, and LACP.
5.
Verify that the MAD IP addresses are correct:
a.
Execute the
display mad verbose
command.
b.
Check the
mad ip address
field to verify the following items:
−
Each member chassis has a MAD IP address.
−
All MAD IP addresses are on the same subnet.
−
The MAD IP addresses are not addresses being used on the IRF fabric.
6.
If the network has multiple IRF fabrics, execute the
display mad verbose
command to verify
that their BFD MAD VLANs are different.
7.
Verify that the physical ports in the BFD MAD VLAN are always up:
a.
Execute the
display trapbuffer
command or use system logs to check for BFD MAD
port-down events that occurred around the split time.
b.
Identify the cause of the events, and remove the issue.
8.
If the issue persists, contact H3C Support.
