Download Campus Network Design Fundamentals by Diane Teare PDF

By Diane Teare

The all-in-one consultant to fashionable routed and switched campus community layout * comprehend the community layout procedure and community layout types * learn the way switches are utilized in community layout * layout an IP addressing plan and choose applicable IP routing protocols * follow community protection layout rules to spice up community defense * let WLANs to enhance group mobility * study QoS layout specifications and instruments * unharness the ability of voice delivery over facts networks, together with VoIP and IP telephony * Use content material networking to supply content material to clients fast and successfully * the best way to combine community administration protocols and instruments into community designs * know the way to successfully combine IP multicast, excessive availability, garage networking, and IPv6 into your community designsOver the prior decade, campus community layout has developed again and again as new applied sciences have emerged and company wishes have replaced. For corporations to exploit cost-saving, productivity-enhancing ideas, corresponding to IP telephony and content material networking, their middle infrastructures needs to comprise the major allowing applied sciences required via those suggestions and supply a resilient, safe origin that may scale to company wishes. as with all structure, designing a high-quality origin is step one.

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Figure 2-7. PVST Allows Redundant Physical Links to Be Used for Different VLANs [View full size image] Part II: Technologies: What you Need to know and why you Need to know it 45 46 Part II: Technologies: What you Need to know and why you Need to know it The top diagram in Figure 2-7 shows the physical topology of the network, with switches X and Y redundantly connected. In the lower-left diagram, switch Y has been selected as the root bridge for VLAN A, leaving port 2 on switch X in the blocking state.

Switches running STP use BPDUs to exchange information with neighboring switches. One of the fields in the BPDU is the bridge identifier (ID); it is comprised of a 2-octet bridge priority and a 6-octet MAC address. STP uses the bridge ID to elect the root bridgethe switch with the lowest bridge ID is the root bridge. If all bridge priorities are left at their default values, the switch with the lowest MAC address therefore becomes the root bridge. In Figure 2-4, switch Y is elected as the root bridge.

The broadcast continues to loop around the network, consuming bandwidth and processing power. This situation is called a broadcast storm. The second problem that can occur in redundant topologies is that devices can receive multiple copies of the same frame. For example, assume that neither of the switches in Figure 2-3 has learned where device B is located. When device A sends data destined for device B, switch X and switch Y both flood the data to the lower LAN, and device B receives two copies of the same frame.

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