R0106-HP MSR Router Series Layer 2 - WAN Configuration Guide(V7)

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Configuring attributes for a dialup interface
Use the following attributes when configuring a dialup interface to improve dial efficiency.
• Link idle-timeout timer—A link idle-timeout timer starts upon establishment of a link. When the
timer expires, DDR disconnects the link.
• Holddown timer—A holddown timer starts upon disconnection of a link. The call attempt to bring
up this link can be made only after the timer expires. This prevents a remote stored program
controlled switch (SPCS) from being overloaded.
• Compete-idle timer—If all the physical interfaces are unavailable when DDR originates a new call,
contention occurs.
Generally, an idle-timeout timer starts upon establishment of a link. If a call to another destination
address is placed at the same time, contention occurs. DDR starts a compete-idle timer to replace
the idle-timeout timer for the link. When the idle time of the link reaches the setting of this
compete-idle timer, the link disconnects.
• Wait-carrier timer—The time DDR waits for a connection to be established might vary call by call.
To handle this situation, use a wait-carrier timer. A wait-carrier timer starts when a call is placed. If
the connection is not established before the timer expires, DDR terminates the call.
• Buffer queue length—If no connection is available when a dialup interface without a buffer queue
receives a packet, it drops the packet. When configured with a buffer queue, the dialup interface
buffers the packet until a connection is available for packet sending.
To configure attributes on a dialup interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter dialup interface view.
interface interface-type
interface-number
N/A
3. Set the link idle-timeout timer.
dialer timer idle idle [ in | in-out ]
By default, the timer is 120
seconds, and only outgoing
interesting packets reset this timer.
4. Set the holddown timer.
dialer timer enable interval The default setting is 5 seconds.
5. Set the compete-idle timer.
dialer timer compete compete-idle
The default setting is 20 seconds.
6. Set the wait-carrier timer.
dialer timer wait-carrier
wait-carrier
The default setting is 60 seconds.
7. Set the buffer queue length.
dialer queue-length packets
By default, packets are not
buffered.
8. Set a description.
description text
The default setting is in the format
of interface-name Interface, for
example, Dialer1 Interface.
9. Set the polling interval.
timer-hold period The default setting is 10 seconds.
10. Set the MTU.
mtu size The default setting is 1500 bytes.
11. Configure the expected
bandwidth.
bandwidth bandwidth-value
By default, the expected
bandwidth (in kbps) is the interface
baud rate divided by 1000.