Cisco 4510R - Catalyst Switch Manual de usuario descargar pdf (Pagina 3)

Supervisor Engine IV

(WS−X4515)

•

Supervisor Engine V

(WS−X4516)

•

Supervisor Engine V−10GE

(WS−X4516−10GE)

•

Catalyst 4510R

(WS−C4510R)

Supervisor Engine V

(WS−X4516)

•

Supervisor Engine V−10GE

(WS−X4516−10GE)

•

Catalyst 4500 Series Switches allow a redundant supervisor engine to take over if the active supervisor engine

fails. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in

RPR or SSO operating mode.

Note: The RPR and SSO redundancy modes require both supervisor engines in the chassis to be of the same

supervisor engine model and to use the same Cisco IOS software image.

With supervisor engine redundancy enabled, if the active supervisor engine fails or if a manual switchover is

performed, the redundant supervisor engine becomes the active supervisor engine. The redundant supervisor

engine is automatically initialized with the startup configuration of the active supervisor engine. This shortens

the switchover time from 30 seconds or longer in RPR mode, depending on the configuration, and a

subsecond in SSO mode.

In addition to the reduced switchover time, supervisor engine redundancy supports these features:

Online insertion and removal (OIR) of the redundant supervisor engine.

Supervisor engine redundancy allows OIR of the redundant supervisor engine for maintenance. When

the redundant supervisor engine is inserted, the active supervisor engine detects it. The redundant

supervisor engine boots into a partially−initialized state in RPR mode and a fully−initialized state in

SSO mode.

•

Software upgrade.

Load the new image on the redundant supervisor engine and conduct a switchover. This minimizes

downtime during software changes on the supervisor engine.

•

When power is first applied to a switch, the supervisor engine that boots first becomes the active supervisor

engine and remains active until a switchover occurs.

What Can Cause the Switchover to Standby?

These are possible causes that can trigger the failover between the active and standby supervisors:

Reload of the active supervisor by administrative request (issue the reload command)•

Software or hardware forced crash of the active supervisor•

Removal of the active supervisor (OIR)•

Active supervisor does not respond to the keepalive maintained between the active and standby

supervisor

•

If hardware diagnostic failure on active is detected during the synchronization process (from Cisco

IOS Software Release 12.1(13)EW and later)

•

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