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Chapter 6
Configuring VoIP
Configure Multilink Point-to-Point Protocol with Interleaving
Note
OL-2031-02
Multiclass multilink Point-to-Point Protocol (PPP) interleaving allows large
packets to be multilink-encapsulated and fragmented into smaller packets to
satisfy the delay requirements of real-time voice traffic. Small real-time packets,
which are not multilink-encapsulated, are transmitted between fragments of the
large packets.
The interleaving feature also provides a special transmit queue for the smaller,
delay-sensitive packets, enabling them to be transmitted earlier than other flows.
Interleaving provides the delay bounds for delay-sensitive voice packets on a slow
link that is used for other best-effort traffic.
In general, multilink PPP with interleaving is used in conjunction with weighted
fair queuing and RSVP or IP precedence to ensure voice packet delivery. Use
multilink PPP with interleaving and weighted fair queuing to define how data is
managed; use RSVP or IP precedence to give priority to voice packets.
You should configure multilink PPP if the following conditions describe your
network:
Point-to-point connection using PPP encapsulation
•
•
Links slower than two Mbps
Do not use multilink PPP on links faster than two Mbps.
You can configure multilink PPP support for interleaving on virtual templates,
dialer interfaces, and ISDN Basic Rate Interface (BRI) or Primary Rate Interface
(PRI) interfaces. To configure interleaving, perform the following tasks:
Configure the dialer interface or virtual template, as defined in the relevant
•
chapters of the Dial Solutions Configuration Guide for
Cisco IOS Release 12.0T.
Configure multilink PPP and interleaving on the interface or template.
•
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Configure IP Networks for Real-Time Voice Traffic
6-7
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Troubleshooting
