CCIE Voice Basics

Hi future CCIE’s (or maybe current CCIE’s),

Today my blog article will contain information on the basics that you need to understand in order to create and configure the basic campus topology.

Before we even touch any of the servers or configure a phone we need to know how to:

• configure VLANS (voice & data VLANS)
• configure IOS DHCP server to provide DHCP service for multiple sites
• configure a TFTP server so the phones can get their image/configuration files (This will be the Unified Communications Manager 7 (Callmanager))
• configure a NTP server to have the time synced on all locations

I will leave things like assigning IP addresses to IP phones out of the scope of this blog article.

All the routers in the topology shown below have the NM-16ESW plugged in to make switching capabilities possible.

Things that we have to configure:

• VOICE & DATA VLAN on all sites
• DHCP on the HQ site
• NTP on all the sites where we configure the HQ as the NTP master

We are going to configure the VLANS according to the following table:

VLAN	HQ	RS1	RS2
Data	100	101	102
Voice	200	201	202

We are going to configure the LAN networks according to the follwing table:

NETWORK	HQ	RS1	RS2
Data	10.10.10.0/24	10.10.11.0/24	10.10.22.0/24
Voice	20.20.20.0/24	20.20.11.0/24	20.20.22.0/24

The networks that are used to do a simple interconnection are:

• Between HQ and RS1 100.100.100.0/24
• Between HQ and RS2 200.200.200.0/24

We don’t need interconnection between RS1 and RS2.

The base configuration will be:

HQ:

hostname HQ

!

interface fastethernet 0/0

ip address 100.100.100.1 255.255.255.0

no shut

!

interface fastethernet 0/1

ip address 200.200.200.1 255.255.255.0

no shut

!

end

RS1:

hostname RS1

!

interface fastethernet 0/0

ip address 100.100.100.2 255.255.255.0

no shut

!

end

RS2:

hostname RS2

!

interface fastethernet 0/0

ip address 200.200.200.2 255.255.255.0

no shut

!

end

The following configuration portions will show you how to configure the VLANS and assign IP addresses to the VLAN interfaces on all sites.

HQ:

vlan database

vlan 100 name HQ-DATA-VLAN state active

vlan 200 name HQ-VOICE-DATA-VLAN state active

exit

RS1:

vlan database

vlan 101 name RS1-DATA-VLAN state active

vlan 201 name RS1-VOICE-DATA-VLAN state active

exit

RS2:

vlan database

vlan 102 name RS2-DATA-VLAN state active

vlan 202 name RS2-VOICE-DATA-VLAN state active

exit

For the DHCP configuration we are going to do something fun…

We are going to configure DHCP:

• for the HQ LAN on the HQ-router
• for the RS1 LAN on the HQ-router
• for the RS2 LAN on the RS2-router

HQ:

interface vlan 200

ip address 20.20.20.1 255.255.255.0

!

ip dhcp pool HQPhones

ip dhcp excluded-address 20.20.20.1

network 20.20.20.0 255.255.255.0

!Specify the Callmanager as the TFTP server

option 150 ip 10.10.10.10

default-router 20.20.20.1

!

ip dhcp pool RS1Phones

ip dhcp excluded-address 20.20.11.1

network 20.20.11.0 255.255.255.0

!Specify the Callmanager as the TFTP server

option 150 ip 10.10.10.10

default-router 20.20.11.1

!

end

RS1:

interface vlan 201

ip helper-address 20.20.20.1

!

end

RS2:

interface vlan 202

ip address 20.20.22.1 255.255.255.0

!

ip dhcp pool HQPhones

ip dhcp excluded-address 20.20.22.1

network 20.20.22.0 255.255.255.0

!Specify the Callmanager as the TFTP server

option 150 ip 10.10.10.10

default-router 20.20.22.1

!

end

For configuring NTP we are going to use the HQ as the NTP server.

To make it easy the HQ, RS1 and RS2 are located in the same time zone (New York)

HQ:

clock timezone PST -8

clock summer-time PDT recurring

ntp master 2

RS1:

clock timezone PST -8

clock summer-time PDT recurring

ntp server 20.20.20.1

RS2:

clock timezone PST -8

clock summer-time PDT recurring

ntp server 20.20.20.1

In my next blog article I will be explaining you what we need to do and check on the Cisco Unified Communications Manager 7 in order to start the actual lab configuration!

–

Regards,

ing. Iwan Hoogendoorn

CCIE #13084 (R&S / Security / SP)

Sr. Support Engineer – IPexpert, Inc.

URL: http://www.IPexpert.com