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Cisco Systems OL-8978-02 manual 55-9, Switch-to-Phone Connections

Models: OL-8978-02

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Chapter 55 Configuring a VoIP Network

Understanding How VLANs Work

Note For more information about the VLANs, see Chapter 11, “Configuring VLANs.”

Figure 55-3shows how to connect a Cisco IP Phone 7960 to a Catalyst 6500 series switch.

Figure 55-3 Switch-to-Phone Connections

Catalyst switch

10/100 module

 

Cisco IP Phone 7960

 

 

 

 

 

 

Phone

 

 

 

 

 

 

 

ASIC

 

 

 

 

 

 

 

 

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Workstation/PC

 

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3-port

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switch

 

 

 

 

 

 

 

Access

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

port

 

 

 

 

 

 

 

 

 

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When the IP phone connects to a 10/100 port on the Catalyst 6500 series switch, the access port (PC-to-phone jack) of the IP phone can be used to connect a PC.

The packets to and from the PC and to and from the phone share the same physical link to the switch and the same port of the switch. The various configurations are shown in the “Cisco IP Phone 7960” section on page 55-2).

Introducing the IP-based phones into the existing switch-based networks raises the following issues:

•The current VLANs might be configured on an IP subnet basis, and additional IP addresses might not be available to assign the phone to a port so that it belongs to the same subnet as other devices (PC) that are connected to the same port.

•The data traffic present on the VLAN supporting phones might reduce the quality of the VoIP traffic.

You can resolve these issues by isolating the voice traffic onto a separate VLAN on each of the ports that are connected to a phone. The switch port that is configured for connecting a phone would have separate VLANs that are configured for carrying the following:

•Voice traffic to and from the IP phone (auxiliary VLAN)

•Data traffic to and from the PC that is connected to the switch through the access port of the IP phone (native VLAN)

Isolating the phones on a separate, auxiliary VLAN increases the quality of the voice traffic and allows a large number of phones to be added to an existing network where there are not enough IP addresses. A new VLAN means a new subnet and a new set of IP addresses.

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

 

OL-8978-02

55-9

 

 

 

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Cisco Systems OL-8978-02 manual 55-9, Switch-to-Phone Connections
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OL-8978-02 specifications

Cisco Systems OL-8978-02 is a comprehensive training curriculum designed to enhance the skills and knowledge of network professionals seeking to advance their careers in network management and security. This curriculum offers a significant focus on Cisco networking technologies and concepts, ensuring that learners are well-equipped to handle the intricacies of modern network environments.

One of the primary features of OL-8978-02 is its in-depth coverage of foundational networking concepts, which are crucial for effective network administration. The curriculum includes detailed modules on networking fundamentals, such as OSI and TCP/IP models, LAN and WAN architectures, and network protocols. This solid foundation enables learners to understand how different networking components interact and function together, forming the backbone of corporate and enterprise environments.

In addition to foundational knowledge, OL-8978-02 integrates a strong focus on security technologies and practices. Considering the increasing prevalence of cyber threats, the course emphasizes the importance of implementing robust security measures. Participants will learn about firewalls, intrusion prevention systems, VPNs, and other critical security technologies. This focus ensures that learners are prepared to safeguard networks against evolving security threats, a necessity in today’s digital landscape.

Another distinguishing characteristic of the OL-8978-02 curriculum is its emphasis on hands-on experience. The program often includes practical labs and simulations, allowing participants to apply theoretical knowledge in real-world scenarios. This experiential learning approach is pivotal for solidifying skills and boosting confidence in network management tasks.

Furthermore, OL-8978-02 addresses the latest advancements in networking technology, including software-defined networking (SDN) and cloud computing. By introducing emerging technologies, this curriculum ensures that professionals remain ahead of the curve, ready to adapt to the future demands of networking.

Finally, Cisco Systems OL-8978-02 positions itself not only as an educational tool but also as a career catalyst, providing learners with skills that are highly sought after in the IT job market. Upon completion, participants often find themselves well-prepared for various Cisco certifications, which can enhance their employability and professional growth opportunities in a competitive landscape. Through its thorough approach, OL-8978-02 plays a vital role in shaping the next generation of network professionals.