With route processor redundancy (RPR+), the redundant supervisor engine is fully initialized and configured, which shortens the switchover time if the active supervisor engine fails. Which three statements are true about the RPR+ operations when the redundant supervisor engine switched over the failed primary supervisor engine? (Choose three)
A.
Static IP routes are maintained across a switchover because they are configured from entries in the configuration file.
B.
Information about dynamic routing states, maintained on the active supervisor engine, is synchronized to the redundant supervisor engine and is transferred during the switchover.
C.
Information about dynamic routing states, maintained on the active supervisor engine, is not synchronized to the redundant supervisor engine and is lost on switchover.
D.
The Forwarding Information Base (FIB) tables are cleared on a switchover. As a result, routed traffic is interrupted until route tables reconverge.
E.
Static IP routes are cleared across a switchover and recreated from entries in the configuration file on the redundant supervisor engine.
F.
The Forwarding Information Base (FIB) tables are maintained during the switchover. As a result, routed traffic continues without any interruption when the failover occurs.
Explanation:
The following guidelines and restrictions apply to RPR+:
RPR+ redundancy does not support configuration entered in VLAN database mode. Use global configuration mode with RPR+ redundancy. Configuration changes made through SNMP are not synchronized to the redundant supervisor engine. Enter a “copy running-config startup-config” command to synchronize the configuration on the redundant supervisor engine. Supervisor engine redundancy does not provide supervisor engine mirroring or supervisor engine load balancing. Only one supervisor engine is active. Network services are disrupted until the redundant supervisor engine takes over and the switch recovers. With RPR+, both supervisor engines must run the same version of Cisco IOS software. If the supervisor engines are not running the same version of Cisco IOS software, the redundant supervisor engine comes online in RPR mode. The Forwarding Information Base (FIB) tables are cleared on a switchover. As a result, routed traffic is interrupted until route tables reconverge. Static IP routes are maintained across a switchover because they are configured from entries in the configuration file. Information about dynamic states maintained on the active supervisor engine is not synchronized to the redundant supervisor engine and is lost on switchover.
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/redund.html