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Access Layer Link Failure

Jul 08,2008 by admin

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Access Layer Link Failure

Because traffic from Host 1 is being sent to the active HSRP address on SW-D1 to be routed, when the link between SW-A2 and SW-D1 fails, SW-D1 recognizes a path in its routing table to VLAN 102 via SW-C2. This is due to SW-D2 advertising VLAN 102 via a dynamic routing protocol to each of its neighbors SW-C1 and SW-C2. The path from SW-A1 to VLAN 102 through SW-C2 is the shortest, assuming the bandwidth of each of the links connecting the core and distribution switches is identical, and no customization of routing metrics has been configured. In most networks, link failures between switches are not a frequent occurrence, and temporary routing of using an indirect path through the core is not an issue. If links between the switches in an environment fail often, bigger issues likely exist. One alternative to this design is to add another Layer 3 link between the distribution switches. This option and the resulting traffic flow are illustrated in Figure 11-9.

Related news

» Addition of a Link Between SW-D1 and SW-D2
by admin posted on Jul 08,2008
» The core block
by alperen posted on Dec 02,2008
» Traffic Flows
by admin posted on Jul 08,2008
» Distribution Layer
by alperen posted on Dec 02,2008
» Scaling Layer 2 Backbones
by alperen posted on Dec 02,2008

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