Usage guidelines
It is a good practice to set the same polling interval for the two ends of a link.
Setting the link status polling interval to zero disables link status check.
Examples
# Set the link status polling interval to 100 seconds on interface Serial 2/0.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-serial2/0] timer hold 100
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