Cisco 4510R - Catalyst Switch Manual de usuario descargar pdf (Pagina 4)

Note: The reload command only reloads the active supervisor. This causes a switchover to the standby

supervisor, if present. This behavior is different than the current Catalyst 6500 Integrated Cisco IOS behavior,

where the reload command causes the whole system to reset.

Route Processor Redundancy

RPR is supported in Cisco IOS Software Release 12.2(12c)EW and later. In this mode, one supervisor is

active and operational. The other supervisor is in standby mode and waits for the active supervisor to fail so

that it can take over and maintain the operation of the switch. The second supervisor is halted during the

bootup sequence and kept in the standby mode. Therefore, the console is not accessible while in that mode. It

starts up in a partially−initialized state and is synchronized with the persistent configuration of the active

supervisor engine.

What is synchronized?

These are synchronized between the active and standby supervisors:

startup configuration (issue the write memory command)•

boot−variable•

configuration−register•

calendar•

VLAN database•

Note: As a part of the standby bootup, the active and standby supervisors exchange Power On Self Test

(POST) status. If the standby detects that the active POST fails, it takes over. If the active supervisor detects

that the standby POST fails, it displays in the show module status command output field for the standby

(since 12.1(13)EW).

What is not synchronized?

These are not synchronized between the active and standby supervisors:

running configurations•

routing table and forwarding shortcuts•

MAC−address table•

other dynamic protocols, such as DHCP database•

What happens during the switchover?

When standby takes over due to any of the preceding reasons, the standby performs these functions:

completes the booting sequence•

resets the modules so they can perform self diagnostics•

parses the configuration•

waits for the modules to come online and establish links•

builds routing tables, MAC−address tables, and other dynamic protocols•

Packets are forwarded while the tables are built. The typical switchover time is less than one minute.

Configuration

With the RPR mode of redundancy, the configuration is automatically enabled upon discovery of a standby

supervisor. No additional configuration is required. Cisco recommends to have this default configuration:

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Cisco 4510R - Catalyst Switch Manual de usuario Pagina 4