4000 Router Series Interface Command Reference

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Parameters

seconds: Specifies the interval at which the interface sends keepalive packets. The value range for this

argument is 0 to 32767 seconds.

Usage guidelines

The polling interval refers to the interval at which the interface sends keepalive packets.

When the link layer protocol of an interface is PPP or HDLC, the link layer periodically sends keepalive

packets to the peer end. If the local end does not receive any keepalive message from the peer end within

a specified period, the link layer considers the peer end as failed and reports the link layer down event.

You can use the timer-hold command to set the interval at which keepalive messages are sent.

On a link with a very low speed, the link might be shut down if the seconds argument is too small. On

a low-speed link, it takes a long time to transmit a large packet, which delays the sending and receiving

of keepalive messages. If an interface fails to receive any keepalive message from the peer within

multiple intervals, the link is considered as failed. If the delay of keepalive messages exceeds the limit,

the link is shut down because it is considered as failed.

Examples

# Set the polling interval to 15 seconds for interface POS 5/1.

<Sysname> system-view

[Sysname] interface pos 5/1

[Sysname-Pos5/1] timer-hold 15