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Do You Need RSVP?
Configuring RSVP
Do You Need RSVP?
Resource Reservation Protocol (RSVP) enables routers to reserve enough bandwidth for reliable
performance. RSVP works well on PPP, HDLC, and similar serial line interfaces. It does not work
well on multiaccess LANs.
You should configure RSVP if you have a serial interface and any of the following:
• Links slower than 2 Mbps
• Links with high utilization
• Need for the best possible voice quality
Note If you configure multilink PPP interleaving, you can use the ip rtp reserve command instead
of configuring RSVP. See the next section on “Do You Need Multilink PPP Interleaving?”
By default, RSVP is disabled for compatibility with routers that do not implement it. To enable
RSVP on an IP network, enter the ip rsvp bandwidth command from interface configuration mode.
The following example shows how to configure RSVP on serial interface 0/0:
Router> enable
Password:
Router# configure terminal
Router(config)# interface serial 0/0
Router(config-if)# ip rsvp bandwidth
The default maximum bandwidth is 75 percent of the bandwidth available on each interface.
RSVP must be enabled at each LAN or WAN interface that voice packets will travel across. You
must also configure each remote dial peer to request an RSVP session, using the req-qos command.
See the section “Calling Between Routers” later in this guide.
Do You Need Multilink PPP Interleaving?
On a dialer, ISDN PRI or BRI interface, or a virtual template, you can configure multilink PPP
interleaving, which helps to make sure that voice packets are transmitted without delay.
You should configure multilink PPP interleaving if you have one of these interfaces, and either of
the following:
• Point-to-point connections using PPP encapsulation
• Links slower than 2 Mbps
Note Do not use multilink PPP on links faster than 2 Mbps.
Voice over IP Quick Start Guide 13