4000 Router Series Layer 2 - WAN Configuration Guide

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To implement MP with DDR, use dialer interfaces. The following shows how MP operates after you

configure the ppp mp and dialer threshold commands on a dialer interface:

• When the ratio of traffic rate to bandwidth on a physical interface assigned to the dialer interface

exceeds the configured load threshold, DDR brings up another physical interface in the dialer

interface, and assigns these links to an MP bundle. If the physical interfaces are ISDN BRI or PRI

interfaces, DDR uses idle B channels on them to form an MP bundle.

• When the number of bundled links reaches the upper threshold specified by the max-bind-num

argument, DDR stops bringing up new links.

Some dial applications require multiple links carry services. To do so, configure the ppp mp min-bind

command to enable DDR to bring up multiple links when triggered to ensure minimum bandwidth. MP

operates in the following workflow:

1. DDR brings up the first link.

2. When the first link comes up, DDR checks whether the number of links in the MP bundle reaches the

lower limit specified by the min-bind-num argument. If it does not, the router brings up the second

link.

This process continues until the number of links in the MP bundle reaches the lower limit.

When MP is used with DDR, the dialer threshold, ppp mp max-bind, and ppp mp min-bind commands

must be configured in dialer interface view. When you configure other PPP commands, follow these

guidelines:

• In the C-DDR approach, configure PPP-related commands such as ppp mp in dialer interface view.

• In the B-DDR approach, configure PPP-related commands such as ppp mp in dialer interface view at

the calling end and in physical interface view at the called end.

Configuration procedure

To configure MP for DDR:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Configure the interval for DDR

to provide traffic statistics.

dialer flow-interval interval

The default is 20 seconds.

This command provides traffic

statistics on dialup links for MP.

3. Enter dialer interface view.

interface dialer number N/A

4. Enable PPP on the dialer

interface.

link-protocol ppp N/A

5. Enable MP.

ppp mp By default, MP is disabled.

6. Set link load thresholds.

dialer threshold traffic-percentage

[ in-out | in | out ]

By default, no load threshold is set.

This command is required only at

the calling end.

If the traffic-percentage argument is

set to 0, DDR will bring up all

available links when triggered and

voids the dialer timer idle

command.