H3C Technologies H3C SecPath F5020 - Manual (Page 34)

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Setting the IRF link down report delay
To prevent frequent IRF splits and merges when IRF links flap, configure the IRF ports to delay reporting
link down events.
An IRF port does not report a link down event to the IRF fabric immediately after its link changes from up
to down. If the IRF link state is still down when the delay is reached, the port reports the change to the IRF
fabric.
IRF ports do not delay link up events. They report the link up event immediately after the IRF link comes
up.
To set the IRF link down report delay:
Step Command Remarks
1. Enter system view. system-view N/A
2. Set the IRF link down
report delay.
irf link-delay interval
By default, an IRF port does not delay any IRF link
down reports.
If the BFD feature is used on the IRF fabric, make sure
the delay interval is shorter than the BFD session
lifetime. For more information about BFD, see High
Availability Configuration Guide.
Configuring BFD MAD
Configuration restrictions and guidelines
When you use BFD MAD, follow these restrictions and guidelines:
Category Restrictions and guidelines
BFD MAD-enabled Layer 3
aggregate interface
• If you are using an intermediate device, assign its ports on the BFD MAD links
to the aggregate interface that is connected to the BFD MAD-enabled
aggregate interface.
• The IRF fabrics in a network must use different BFD MAD-enabled interfaces.
BFD MAD-enabled Layer 3
aggregate interface and
feature compatibility
Do not use the BFD MAD-enabled interface for any purpose other than
configuring BFD MAD.
• Configure only the mad bfd enable and mad ip address commands on the
BFD MAD-enabled interface. If you configure other features, both BFD MAD
and other features on the interface might run incorrectly.
• Do not bind a BFD MAD-enabled interface to any VPN instance. The MAD
feature is mutually exclusive with VPN.
MAD IP address
• To avoid problems, only use the mad ip address command to configure IP
addresses on the BFD MAD-enabled interface. Do not configure an IP
address by using the ip address command or configure a VRRP virtual
address on the BFD MAD-enabled interface.
• All MAD IP addresses on the BFD MAD-enabled interface must be on the
same subnet.