Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 41)

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Active Supervisor Engine Failure

The standby supervisor engine can detect the failure of the active supervisor engine using one of the following

methods:

●

Redundancy framework heartbeats sent across the VSL

●

VSL Protocol (VSLP)

●

Cisco Generic Online Diagnostics (GOLD) failure event

●

CDL-based hardware assistance

●

Full VSL link down

Upon detecting the failure of the active supervisor, the hot-standby supervisor engine performs an SSO switchover

and assumes the role of the active supervisor. The newly active supervisor engine simulates an an online insertion

and removal (OIR) removed event for all modules in the previous active chassis to remove those cards from the

running chassis inventory. Subsequently, if the VSS is running Quad-Sup Uplink Forwarding or if the failed supervisor

is capable of performing a reload the failed chassis will be reloaded. This chassis will then become the VSS Hot

Standby (Figure 27).

The effect on the data path is that all the modules on the previous active virtual switch chassis are brought down,

resulting in a slight traffic disruption for those traffic flows that were destined to the associated VSS chassis. The

duration of disruption depends on the network configuration.

The best practice recommendation

dictates that devices connect to the VSS using two or more interfaces in a

redundant fashion (across both chassis), such is the case when using multichassis etherchannel or redundant layer 3

equal cost paths across both switches. If there are redundant connections made across the VSS then theoutage

duration is typically a sub-second event...

For the multichassis Cisco EtherChannel links, the remote endpoint of the link detects the failure of the active virtual

switch ports through LACP or PAgP or a physical link-down situation and uses the links connecting to the standby

virtual switch instead.

For network designs where redundant connections cannot be made across the two switches the outage duration

depends on how quickly the physical supervisor module can be replaced. The Quad-Sup Uplink Forwarding feature

introduced in the 12.2(33)SXI4 feature greatly reduces this outage time as well as automates the configuration and

recovery. If the VSS is using Quad-Sup Uplink Forwarding then the chassis experiencing the supervisor failure simply

performs a reload and the former in-chassis standby supervisor will then boot as the in-chassis active supervisor

module. See the High Availability section of this document for more details on Quad-Sup Uplink Forwarding.

Cisco Campus 3.0 Virtual Sw itching System Design Guide

http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/VSS30dg/campusVSS_DG.html

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 41