3Com 3C13636 Configuration Manual page 1421

3Com Router 3000 Ethernet Family
Configuration Guide
exceeds the defined traffic threshold, the system brings up the third link, and
assigns it to the MP bundle, so on and so forth. This ensures appropriate traffic
distribution for DCC links.
On the contrary, when the percentage of the traffic of N (which is an integer
greater than 2) links to the bandwidth of N-1 links is smaller than the defined traffic
threshold, the system will automatically shutdown a link, so on and so forth. Thus,
the utility rate of DCC links can be kept within an appropriate range.
To implement MP binding with DCC, you must use dialer interfaces. The following is
how MP operates after you configure the ppp mp and dialer threshold commands on
a dialer interface:
1) When the ratio of traffic to bandwidth on a physical interface (or B channel)
assigned to the dialer interface exceeds the load threshold, DCC brings up
another physical interface assigned to the dialer interface, and assigns these links
to an MP bundle. If the physical interfaces are ISDN BRI or PRI interfaces, DCC
uses idle B channels on them to form an MP bundle.
2) When the number of bundled links reaches the upper threshold specified by the
max-bind-num argument, DCC stops to bring up new links.
Note that when MP is used with DCC, the commands dialer threshold, ppp mp
max-bind, and ppp mp min-bind must be configured in dialer interface view. When
configuring other PPP commands, observe the following:
In the C-DCC approach, configure in dialer interface view.
In the RS-DCC approach, configure in dialer interface view at the calling end and
in physical dial interface view at the called end. At the calling end, however, you
are recommended to configure the same PPP parameters on both dialer and
physical dial interfaces, to ensure reliable PPP link negotiation.
Table 1-14 Configure MP by setting link load thresholds
Enable MP
Configure upper limit of links in an MP
bundle
Set link load thresholds
By default, the upper limit of links in an MP bundle is 16, MP is disabled, and link load
threshold is not configured.
Operation
3Com Corporation
1-20
Chapter 1 DCC Configuration
Command
ppp mp
ppp mp max-bind max-bind-num
dialer threshold
[ in-out | in | out ]
traffic-percentage