Authorized self-study guide: designing Cisco network service by Hutton, Keith

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VLAN Trunking Protocol (VTP) is a protocol that enables network managers to centrally manage the VLAN database. VTP transparent mode is now a recommended practice because it decreases the potential for operational error. By default, Cisco switches are configured as a VTP server with no VTP domain name specified. Therefore, it is also recommended when configuring switches along with setting the mode to Transparent, to set the VTP domain name. This is important if you are connecting your switch to other domains, such as a service provider switch.

The primary deployment scenario for Cisco NSF with SSO is in the enterprise network edge. Here, the data link layer generally consists of point-to-point links either to service providers or redundant Gigabit Ethernet point-to-point links to the campus infrastructure. In nonredundant topologies, using Cisco NSF with SSO and redundant supervisors can provide significant resiliency improvements. Provide Alternate Paths The recommended distribution layer design is redundant distribution layer switches and redundant connections to the core with a Layer 3 link between the distribution switches, as illustrated in Figure 2-6.

An alternative solution is a Layer 2 core with discrete VLANs on each core switch. This scenario requires only two ports per distribution layer switch—regardless of the number of buildings (switch blocks)—and so you can avoid the expense of multilayer core switches. In Figure 2-4, a distribution module in the second building of two interconnected switches requires four additional links for full-mesh connectivity to the first module. A third distribution module to support the third building would require 8 additional links to support connections to all the distribution switches, or a total of 12 links.

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