H3C Technologies H3C S12500-X Series Switches - Manual (Page 25)

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• Changes occur to the VLAN attribute of a port.
• The rule specified in the cfd mip-rule command changes.
An MA with no VLAN attribute is mainly used to detect direct link status. It cannot generate MIPs.
For an MA with VLAN attribute, if the same or higher level MEP exists on the interface, no MIP is
generated for the MA on the interface.
To configure the rules for generating MIPs:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure MIP
auto-generation rules. cfd mip-rule { default | explicit }
service-instance instance-id
By default, no rules for generating
MIPs are configured, and the
system does not automatically
create any MIP.
Configuring CFD functions
Configuration prerequisites
Complete basic CFD settings.
Configuring CC on MEPs
Configure CC before configuring other CFD functions. After the CC function is configured, MEPs in an
MA can periodically send CCM frames to maintain connectivity. When the lifetime of a CCM frame
expires, the link to the sending MEP is considered disconnected. When setting the CCM interval, use the
settings described in Table 5 .
Table 5 CCM interval field encoding
CCM interval field Transmission interval Maximum CCM lifetime
1 10/3 milliseconds 35/3 milliseconds
2 10 milliseconds 35 milliseconds
3 100 milliseconds 350 milliseconds
4 1 second 3.5 seconds
5 10 seconds 35 seconds
6 60 seconds 210 seconds
7 600 seconds 2100 seconds
Follow these guidelines when you configure CC on a MEP:
• Configure the same CCM interval field value for all MEPs in the same MA.
• The switch does not support a CCM interval field value in the range of 1 to 3. If you configure a
CCM interval field value of 1, 2, or 3, the value of 4 takes effect.
• Configurations in Ethernet interface view take effect only on the current interface.