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Chapter 6
Configuring VoIP
Configure RSVP for Voice
Enable RSVP
OL-2031-02
Resource Reservation Protocol (RSVP) enables routers to reserve enough
bandwidth on an interface to provide reliable, high-quality performance. RSVP
allows end systems to request a particular QoS from the network. Real-time voice
traffic requires network consistency. Without consistent QoS, real-time traffic
can experience jitter, insufficient bandwidth, delay variations, or information
loss. RSVP works in conjunction with current queuing mechanisms. The interface
queuing mechanism (such as weighted fair queuing or WRED) must implement
the reservation.
RSVP works well on PPP, HDLC, and similar serial line interfaces. It does not
work well on multiaccess LANs. RSVP can be equated to a dynamic access list
for packet flows.
You should configure RSVP to ensure QoS if the following conditions describe
your network:
Small-scale voice network implementation
•
Links slower than 2 Mbps
•
Links with high utilization
•
Need for the best possible voice quality
•
To minimally configure RSVP for voice traffic, you must enable RSVP on each
interface where priority is required.
By default, RSVP is disabled so that it is backward compatible with systems that
do not implement RSVP. To enable RSVP for IP on an interface, use the following
command:
ip rsvp bandwidth [interface-kbps] [single-flow-kbps]
interface-kbps represents the maximum amount of bandwidth, in kbps, that may
be allocated by RSVP flows and single-flow-kbps represents the maximum
amount of bandwidth, in kbps, that may be allocated to a single flow. The range
for both arguments is from 1 to 10,000,000.
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Configure IP Networks for Real-Time Voice Traffic
6-5
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Troubleshooting
