Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 42)

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Figure 27. Quad-Sup Uplink Forw arding

Hot-Standby Supervisor Engine Failure

You can detect the failure of the hot-standby supervisor engine in the following ways:

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Redundancy framework heartbeats sent across the VSL by the active supervisor

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Full VSL link-down situation

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Cisco Generic Online Diagnostics GOLD failure event

Upon detecting the failure of the hot-standby supervisor engine, the active supervisor engine simulates an OIR

removed event for all modules in the standby virtual switch. This simulation is performed because the modules on the

remote chassis have no connectivity because VSL communication to the modules is proxied by the local supervisor-

engine CPU (Figure 28).

Figure 28.

The effect on the data path is that all line cards on the standby virtual switch are brought down. Assuming that

adjacent devices are dual-homed to both the active virtual switch and standby virtual switch, only those flows being

forwarded through the standby virtual switch are affected, and the time to recovery depends on the mechanism used

to detect the link failure (Cisco EtherChannel technology, Layer 3 load balancing, or Spanning Tree Protocol). Upon

detecting that the interface connected to the standby virtual switch has failed, traffic resorts to using the link to the

active supervisor engine. Those data flows passing through the active virtual switch are not affected. The control

plane is not affected because the control-plane functions remain on the active supervisor engine on the active virtual

switch. The control plane experiences a removal of all of the standby virtual switch interfaces.

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 42