Building a VoIP Network Part 3 Eric Kwok CCIE 43698 RampS Technical Manager APAC Region Session 3 Why do we need Voice VLAN Access port or trunk port Tagged or not tagged Why ID: 564292
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Slide1
Packet Tracer 6Building a VoIP Network (Part 3)
Eric KwokCCIE #43698 (R&S)
Technical Manager, APAC RegionSlide2
Session 3
Why do we need Voice VLAN?Access port or trunk port?Tagged or not tagged?Slide3
Why?
Performance (Broadcast domain)Manageability (apply policy, QoS, logical group, addressing)Independent of Physical Topology (connect phone to any vlan access port)Security (boundary between data and voice packet)Access vlan 10Voice vlan 20
Access
vlan
20
(voice)
Access
vlan
10
(data)Slide4
Phone boot up
CDPNative
VLAN
10
Voice
VLAN
20
PoE
PowerSlide5
Voice VLAN
SW(config-if)# switchport mod accessSW(config-if)# switchport access vlan 10SW(config-if)# switchport voice vlan 20
Data
vlan
10
Voice
vlan
20
Fa0
/1
SW
PC
Special
802.1Q
trunk through
CDP
V
20
D
D
PCP (Priority or
CoS
)Slide6
SW#sh
int switchport Name: Fa0/1Switchport: EnabledAdministrative Mode: static accessOperational Mode: static accessAdministrative Trunking Encapsulation: dot1qOperational Trunking Encapsulation: nativeNegotiation of Trunking: OffAccess Mode VLAN: 10 (data)Trunking Native Mode VLAN: 1 (default)Voice VLAN: 20Administrative private-vlan host-association: noneAdministrative private-
vlan
mapping: none
Administrative private-
vlan
trunk native
VLAN
: none
Administrative private-
vlan
trunk encapsulation:
dot1q
Administrative private-
vlan
trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: noneOperational private-
vlan: noneTrunking VLANs Enabled: All
Pruning
VLANs
Enabled: 2-1001
Capture Mode Disabled
Capture
VLANs
Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
SW#sh
int
switchport
Name
:
Fa0
/6
Switchport
: Enabled
Administrative Mode: dynamic auto
Operational Mode: down
Administrative
Trunking Encapsulation:
dot1qOperational Trunking Encapsulation: nativeNegotiation of Trunking: On
Access Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)
Voice VLAN: noneAdministrative private-
vlan host-association: noneAdministrative private-vlan mapping: noneAdministrative private-vlan trunk native VLAN: none
Administrative private-
vlan
trunk encapsulation:
dot1q
Administrative private-
vlan
trunk normal
VLANs
: none
Administrative private-
vlan
trunk private
VLANs
: none
Operational private-
vlan
: none
Trunking
VLANs
Enabled: All
Pruning
VLANs
Enabled: 2-1001
Capture Mode Disabled
Capture
VLANs
Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabledSlide7
CoS
Ethernet Frame to include QoSNo field to specific the priority of the frame802.1p task group to work on the traffic classesUsed in 802.1Q tag (3 bits PCP)Slide8
CoS
in Voice FrameTPCI
PCP
DEI
CFI
VLAN
ID
S.MAC
D.MAC
Type/
Length
Payload
FCS
S.MAC
D.MAC
802.1Q
Tag
Payload
FCS
Type/
Length
Priority
0-7
VLAN
0-4095
0x8100Slide9
Lab Setup
SPAN PortPoE PortsCisco 891W 4 Ports PoE
Packet captureSlide10
Phone CDP
Phone sending out
CDP
Cisco 7970
Request
10.25W
PoE
power
Max Power Consumption
Packet captureSlide11
Router (integrated Switch) CDP
Cisco 891 Router
CDP
from Router
Native
VLAN
for Data (untagged)
Voice
VLAN
(tagged)
Available
PoE
PowerSlide12
Voice
VLAN 20Slide13
Priority in VLAN
Tag (Voice and Data Frame)Voice Frame VLAN 20RTP , Pri 5SKINNY, Pri 0, 3
7961 Data Frame untagged
Native
VLAN
Packet captureSlide14
Data Frame
VLAN 10, Pri 07970 Data Frame taggedVLAN 10, Pri 0
7961 Data Frame untagged
Native
VLANSlide15
Let‘s go to
Packet TracerV20D
D
V
20
D
10
V
20
D
Special
802.1Q
trunk through
CDP
PCP (Priority or
CoS
)Slide16
Session 3 Summary
Why do we need Voice VLAN?Both data vlan and voice vlan in single portSecurity (diff vlan, policy) and performance (broadcast domain)Access port or trunk port?Special trunk or access port which can handle 802.1Q tagTagged or not tagged?Voice is tagged with CoS setData could be tagged or not tagged depends on the phone modelNotes:Port security, max 2 addresses