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This section covers designs for high availability network services in the access layer. Redundancy Models When designing a network topology...
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Virtual Router Redundancy Protocol (VRRP) is a router redundancy protocol defined in RFC 3768. VRRPv2 supports only IPv4. RFC 5798...
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Virtual Switching System (VSS) solves the Spanning Tree Protocol unused blocked links problem by converting the distribution switching pair into...
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Designing redundant routes has two purposes: balancing loads and increasing availability. Load Balancing Most IP routing protocols can balance loads...
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In mission-critical applications, it is often necessary to provide redundant media. In switched networks, switches can have redundant links to...
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A campus LAN connects two or more buildings within a local geographic area using a high-bandwidth LAN media backbone. Usually,...
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For the access layer of a campus LAN, you can classify and mark frames or packets to apply quality-of-service (QoS)...
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WANs provide network connectivity for the enterprise core and remote branch locations. The enterprise edge, on the other hand, securely...
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Enterprises can have multiple WAN interconnections. WAN connectivity between an organization’s headquarters and remote sites is generally across a service...
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Several factors should be considered when selecting a WAN transport technology. Some WAN options are public Internet based, and some...
