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Nexus Switching 2nd Edition

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Figure 3-13. HSRP/VRRP Interaction with vPC<br />

It is also recommended to configure a method to protect against complete uplink <strong>and</strong> local<br />

Layer 3 failures in a vPC environment. Because vPC employs loop prevention in hardware,<br />

it is recommended to implement IGP routing acr<strong>os</strong>s either a dedicated router link between<br />

the vPC peers or via an SVI acr<strong>os</strong>s the peer-link. Figure 3-14 illustrates a dedicated routed<br />

link between the two vPC peers to be used for IGP routing. Using traditional methods such<br />

as object-tracking for HSRP/VRRP might lead to a black-hole scenario for traffic being<br />

forwarded acr<strong>os</strong>s two different vPC interfaces. This occurs because a complete local Layer<br />

3 failure on one of the switches would lead to all traffic being forced acr<strong>os</strong>s the peer-link,<br />

triggering vPC to drop any traffic received from the peer-link destined for another vPC<br />

interface. IGP routing between vPC peers enables traffic to be properly forwarded if an<br />

uplink or local Layer 3 failure occurs.

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