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Chapter 3
Configuring Ethernet Switching
Note
Configuring a Single Subnet for Voice and Data
OL-2031-02
Configuring Ethernet Ports to Support IP Phones and a Daisy-Chained Workstation
The following example provides a sample configuration:
interface Vlan 160
description voice vlan
ip address 10.6.1.1 255.255.255.0
interface Vlan 60
description data vlan
ip address 10.60.1.1 255.255.255.0
interface Serial1/0
ip address 160.3.1.2 255.255.255.0
Standard IGP routing protocols such as RIP, Interior Gateway Routing
Protocol (IGRP), Enhanced Interior Gateway Routing Protocol (EIGRP), and
open shortest path first (OSPF) are supported on the Catalyst 4224. Multicast
routing is also supported for PIM dense mode, sparse mode, and sparse-dense
mode.
For network designs with incremental IP telephony deployment, network
managers can configure the Catalyst 4224 so that the voice and data traffic coexist
on the same subnet. This might be necessary when it is impractical to allocate an
additional IP subnet for IP phones. You must still prioritize voice above data at
both Layer 2 and Layer 3.
Layer 3 classification is already handled because the phone sets the type of
service (ToS) bits in all media streams to an IP Precedence value of 5. (With
Cisco CallManager Release 3.0(5), this marking changed to a Differentiated
Services Code Point [DSCP] value of EF.) However, to ensure that there is
Layer 2 classification for admission to the multiple queues in the branch office
switches, the phone must also use the User Priority bits in the Layer 2 802.1p
header to provide class of service (CoS) marking. Setting the bits to provide
marking can be done by having the switch look for 802.1p headers on the native
VLAN.
Catalyst 4224 Access Gateway Switch Software Configuration Guide
3-7
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Troubleshooting
