Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 40)

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First Hop Redundancy Protocols

First Hop Redundancy Protocols (Hot Standby Router Protocol [HSRP], Gateway Load Balancing Protocol [GLBP],

and Virtual Router Redundancy Protocol [VRRP]) provide default gateway redundancy for devices when there are

two or more redundant routing nodes but the attached devices are not learning the network topology through Layer 3

routing protocols.

Typically, in a standalone environment, these First Hop Redundancy Protocols (FHRPs) are required to provide a

single default gateway that is both redundant and highly available. These protocols typically designate an active

forwarder for a given pair of Layer 3 interfaces by using respective hello protocols. Additionally, a separate instance

of these hello protocols is run for each pair of interfaces for which the FHRP is configured.

In a Cisco Virtual Switching System environment, the use of FHRPs to provide default gateway redundancy has been

obviated in most environments because a single interface and router MAC address are shared across both virtual

switches (Figure 25).

Figure 25. First Hop Redundancy Protocols

You can enable FHRP to another network device or Cisco Virtual Switching System with the FHRP frames redirected

to the route processor of the active virtual switch for processing.

Failure Scenarios

This section assumes the topology shown in Figure 26.

Figure 26. Failure Scenarios

In the topology of Figure 26, the Cisco Virtual Switching System is deployed in the distribution layer of the network,

where we will examine the effects that different failures will have on this setup.

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 40