4802.1Q tag assignment | Nortel Networks 42C4911 specs

Nortel Networks 42C4911 manual 4802.1Q tag assignment

Figure 3-4802.1Q tag assignment

Figure 3-5802.1Q tagging (after 802.1Q tag assignment)

42C4911 specifications

Models: 42C4911

Alteon OS Application Guide

After

In Figure 3-4, tagged incoming packets are assigned directly to VLAN 2 because of the tag assignment in the packet. Port 5 is configured as a tagged member of VLAN 2, and port 7 is configured as an untagged member of VLAN 2.

			PVID = 2
			PVID = 2
Tagged packet
Tagged packet					4
					4
CRC	Data	Tag	SA	DA	Port
CRC	Data	Tag	SA	DA

Before

Port 1		Port 2	Port 3
	802.1Q Switch

Port 6		Port 7	Port 8

Port 5

Tagged member of VLAN 2

Untagged member of VLAN 2

BS45013A

As shown in Figure 3-5, the tagged packet remains unchanged as it leaves the switch through port 5, which is configured as a tagged member of VLAN 2. However, the tagged packet is stripped (untagged) as it leaves the switch through port 7, which is configured as an untagged member of VLAN 2.

PVID = 2

Port 4

Port 5

Tagged member of VLAN 2

CRC Data Tag SA DA

Untagged member	CRC*	(*Recalculated)
of VLAN 2
	Data
	SA	Outgoing
	SA	untagged packet
	DA	changed
	DA	(tag removed)

8100

Priority

CFI

VID = 2

16 bits

3 bits

1 bit

12 bits

Key

Priority

- User_priority

CFI

- Canonical format indicator

VID

- VLAN identifier

BS45014A

NOTE – Set the configuration to factory default (/boot/conf factory) to reset all non- management ports to VLAN 1.

42C4911, January 2007

Chapter 3: VLANs 83

Nortel Networks 42C4911 is a key hardware component designed to meet the needs of modern telecommunications infrastructure. As part of Nortel's extensive portfolio, the 42C4911 has made a significant impact on network design and operation, particularly in enterprises requiring reliable and efficient communication solutions.

One of the standout features of the 42C4911 is its modularity. This allows for flexible configurations and upgrades, enabling organizations to adapt to changing technology requirements and business demands. The design philosophy behind the 42C4911 emphasizes scalability, allowing users to start with a basic setup and expand it as their networking needs grow. This feature is particularly appealing to medium and large enterprises that anticipate increased data and communication requirements over time.

In terms of technology, the 42C4911 supports various telecommunications standards, making it versatile for multiple applications. It typically integrates with other Nortel equipment and can work with third-party devices, ensuring seamless interoperability across different platforms. This is critical as organizations look to create unified communications systems that can handle voice, data, and video traffic efficiently.

The 42C4911 is known for its robust performance and reliability. It is designed to operate continuously under demanding conditions, which is essential for organizations that rely on constant connectivity for their operations. Its built-in redundancy features help safeguard against potential failures, thus enhancing the overall stability of the network. This reliability is further complemented by Nortel's commitment to high-quality manufacturing standards, ensuring that users receive a durable and efficient product.

Security is another major consideration for any networking device, and the 42C4911 provides advanced security features to protect sensitive data. With increasing cybersecurity threats, organizations prioritize devices that offer strong encryption and access control mechanisms. The 42C4911 addresses these needs while facilitating secure communication channels for users, which is essential in today's increasingly interconnected world.

Overall, the Nortel Networks 42C4911 stands out as a versatile and powerful component in the telecommunications landscape. Its modular design, compatibility with diverse technologies, reliability, and emphasis on security make it an appealing choice for organizations looking to enhance their networks. As companies continue to navigate the complexities of communication, devices like the 42C4911 play a crucial role in ensuring that they remain connected and efficient.

802.1Q Switch