HP MSR2000/3000/4000 Router Series Layer 2 - WAN Configuration Guide

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• 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, preventing a remote PBX from being
overloaded.
• Compete-idle timer—If all the channels are unavailable when DDR originates a new call,
contention occurs.
Generally, an idle-timeout timer starts upon setup 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 upon expiration of the timer, DDR terminates the call.
• Buffer queue length—If no connection is available when a dialup interface without a buffer queue
receives a packet, it will drop the packet. Configured with a buffer queue, the dialup interface will
buffer the packet until a connection is available for packet sending.
To configure attribute parameters on a dialup interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter dialup interface
(physical or dialer interface)
view.
interface interface-type
interface-number
N/A
3. Set the link idle-timeout timer.
dialer timer idle seconds [ 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 seconds The default setting is 5 seconds.
5. Set the compete-idle timer.
dialer timer compete seconds The default setting is 20 seconds.
6. Set the wait-carrier timer.
dialer timer wait-carrier seconds 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 MTU.
mtu size The default setting is 1500 bytes.
10. Configure the expected
bandwidth.
bandwidth bandwidth-value
By default, the expected
bandwidth (in kbps) is the interface
baud rate divided by 1000.
11. Restore the default settings.
default N/A
12. Bring up the dialup interface.
undo shutdown By default, a dialup interface is up.