Practice Q's - VSS Flashcards
Which redundancy mode for supervisor engine modules exhibits all of the following characteristics?
Static routes are maintained during a switchover
The Forwarding Information Base (FIB) is cleared during a switchover Dynamic route information is cleared during a switchover
Route engine is initialized and switch modules are loaded
A. RPR
B. RPR+
C. SSO
D. NSF
Answer: B
Explanation:
Redundant supervisor engine modules can be configured in several modes. In route processor redundancy plus (RPR+) mode, the backup module is booted up and the supervisor and route engines initialize. However, no Layer 2 or Layer 3 functions are started, which means it will be necessary to start them after a failover. This also means the routing protocols must re-converge and the FIB table must be rebuilt, since it is derived from the routing table. The static routes are maintained in the running configuration, so they are not lost in the failover.
In route processor redundancy (RPR) mode, the module is booted, but the supervisor and route engines are not initialized.
In stateful switchover (SSO) mode, all functionality provided by RPR+ is available at failover, and the FIB table is not
