Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Manual de usuario descargar pdf (Pagina 36)

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Hybrid systems with redundant supervisor/MSFC combinations can optionally have two active MSFCs in the same

chassis (referred to as Dual Router Mode). In this conﬁguration, HSRP is conﬁgured internally between both active

MSFCs. With Cisco IOS Software, the standby MSFC is not fully operational. Thus, it is not possible to run internal

HSRP between the two MSFCs. External HSRP from the Cisco Catalyst 6500 to other routers in the network is

supported in either RPR or RPR+ mode with the Cisco IOS Software.

There is no stateful protocol redundancy between supervisor engines with RPR or RPR+. The conﬁgurations are

automatically synced up between active and standby supervisors in Cisco IOS Software.

The following section provides an overview of supervisor redundancy characteristics that are different between RPR

and RPR+.

Route Processor Redundancy (RPR)

With RPR enabled, the active supervisor and MSFC are operational and responsible for all packet forwarding and

features. The standby supervisor and MSFC are out of reset but not all subsystems are booted. The standby

supervisor is booted to the point where the gigabit uplink ports are operational, but no protocols are running on the

supervisor or MSFC.

Upon an active Supervisor failure, RPR detects the loss of the active supervisor and causes a switchover. The line

cardsare power-cycled,thesupervisor and MSFCﬁnishbooting,and all Layer2andLayer 3 protocolsareinitialized.

The fail-over time for the systemto start forwarding trafﬁc in EHSA is approximately 90 seconds. Theactual failover

time is dependent on the size and complexity of the conﬁguration.

With RPR, the startup conﬁguration and boot variables are synchronized between the active and standby supervisor.

Route Processor Redundancy Plus (RPR+)

With RPR+ enabled, the active supervisor and MSFC are operational and responsible for all packet forwarding and

features. The standby supervisor and MSFC are fully booted and running on standby. Since the standby supervisor

is further along in the boot process, RPR+ provides a faster supervisor failover than RPR. In addition, the line card

state is maintained during a supervisor failover. This helps to reduce the failover time. However, the port states are

not maintained, so connections to other devices will ﬂap.

The failover time for the system to start forwarding trafﬁc in RPR+ is approximately 30 seconds. The actual failover

time is dependent on the size and complexity of the conﬁguration.

Appendix A: Cisco IOS Software and CatOS Configuration Sample Comparison

This section walks you through a complete Cisco IOS mode conﬁguration versus a CatOS conﬁguration for a sample

topology (Figure 5):

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Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Manual de usuario Pagina 36