Packet Tracer 6 Building a Vo IP Network

Packet Tracer 6 Building a Vo. IP Network (Part 3) Eric Kwok CCIE #43698 (R&S) Technical Manager, APAC Region Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

• Why do we need Voice VLAN? • Access port or trunk port? • Tagged or not tagged? Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

• Performance (Broadcast domain) • Manageability (apply policy, Qo. S, logical group, addressing) • Independent of Physical Topology (connect phone to any vlan access port) • Security (boundary between data and voice packet) Access vlan 10 Voice vlan 20 Cisco Networking Academy Access vlan 20 (voice) Access vlan 10 (data) © 2014 Cisco Systems, Inc. All rights reserved.

CDP Native VLAN 10 Voice VLAN 20 Po. E Power Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

• SW(config-if)# switchport mod access • SW(config-if)# switchport access vlan 10 • SW(config-if)# switchport voice vlan 20 PCP (Priority or Co. S) D Special 802. 1 Q trunk through CDP 20 PC SW V D Fa 0/1 Data vlan 10 Voice vlan 20 Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

SW#sh int switchport Name: Fa 0/1 Switchport: Enabled Administrative Mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot 1 q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 10 (data) Trunking Native Mode VLAN: 1 (default) Voice VLAN: 20 Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot 1 q 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: disabled Appliance trust: none Name: Fa 0/6 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: down Administrative Trunking Encapsulation: dot 1 q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot 1 q 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: disabled Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

• Ethernet Frame to include Qo. S • No field to specific the priority of the frame • 802. 1 p task group to work on the traffic classes • Used in 802. 1 Q tag (3 bits PCP) Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

S. MAC D. MAC Type/ Length S. MAC D. MAC 802. 1 Q Tag Cisco Networking Academy Payload Type/ Length FCS Payload TPCI PCP 0 x 8100 Priority 0 -7 FCS DEI CFI VLAN ID VLAN 0 -4095 © 2014 Cisco Systems, Inc. All rights reserved.

Packet capture SPAN Port Cisco 891 W 4 Ports Po. E Ports Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

Packet capture Phone sending out CDP Cisco 7970 Request 10. 25 W Po. E power Max Power Consumption Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

CDP from Router Cisco 891 Router Native VLAN for Data (untagged) Voice VLAN (tagged) Available Po. E Power Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

Voice VLAN 20 Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

Packet capture Voice Frame VLAN 20 • RTP , Pri 5 • SKINNY, Pri 0, 3 7961 Data Frame untagged Native VLAN Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

7961 Data Frame untagged Native VLAN Data Frame VLAN 10, Pri 0 7970 Data Frame tagged VLAN 10, Pri 0 Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

PCP (Priority or Co. S) 20 D V 20 V D 20 V 10 D D Special 802. 1 Q trunk through CDP Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.

• Why do we need Voice VLAN? • Both data vlan and voice vlan in single port • Security (diff vlan, policy) and performance (broadcast domain) • Access port or trunk port? • Special trunk or access port which can handle 802. 1 Q tag • Tagged or not tagged? • Voice is tagged with Co. S set • Data could be tagged or not tagged depends on the phone model • Notes: • Port security, max 2 addresses Cisco Networking Academy © 2014 Cisco Systems, Inc. All rights reserved.