Configuring attributes for a dialup interface
Use the following attributes when configuring a dialup interface to improve dial efficiency.
Link idle-timeout timer—Starts upon establishment of a link. When the timer expires, DDR disconnects the link.
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 timer prevents a remote stored program controlled switch (SPCS) from being overloaded.
Compete-idle timer—Starts if all physical interfaces are unavailable when DDR initiates a new call. When the amount of idle time of a link reaches the compete-idle timer setting, the link disconnects.
Wait-carrier timer—Limits the amount of time DDR waits for a connection to be established for a call. 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—Length of a buffer queue. With a buffer queue, the dialup interface buffers the packet until a connection is available for packet sending. If no connection is available when a dialup interface without a buffer queue receives a packet, the dialup interface drops the packet.
To configure attributes for a dialup interface:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter dialup interface view. | interface dialer 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 wait-carrier timer. | dialer timer wait-carrier wait-carrier | The default setting is 60 seconds. |
6. Set the buffer queue length. | dialer queue-length packets | By default, packets are not buffered. |
7. Set a description. | description text | The default setting is in the format of interface-name Interface, for example, Dialer1 Interface. |
8. Set the keepalive interval. | timer-hold seconds | The default setting is 10 seconds. |
9. Set the keepalive retry limit. | timer-hold retry retries | The default setting is five. A link is removed after the keepalive retry limit is reached. |
10. Set the MTU. | mtu size | The default setting is 1500 bytes. |
11. Set the expected bandwidth. | bandwidth bandwidth-value | By default, the expected bandwidth (in kbps) is the interface baud rate divided by 1000. |
12. (Optional.) Specify a primary traffic processing slot for the interface. |
| By default, no primary traffic processing slot is specified for an interface. |
13. (Optional.) Specify a backup traffic processing slot for the interface. |
| By default, no backup traffic processing slot is specified for an interface. |
14. Restore the default settings. | default | N/A |
15. Bring up the dialup interface. | undo shutdown | By default, a dialup interface is up. |