300-510 · Question #3
After you change the IP address on an IOS XR router, you cannot ping the new address. Which step did you forget to complete?
The correct answer is A. commit the configuration. Cisco IOS XR uses a two-phase configuration model with a candidate (uncommitted) configuration and a running configuration. Any changes made in the CLI session are held in the candidate configuration and do NOT take effect until you explicitly issue the 'commit' command. Without
Question
After you change the IP address on an IOS XR router, you cannot ping the new address. Which step did you forget to complete?
Options
- Acommit the configuration
- Broll back the configuration
- Cmerge the configuration
- Dsave the running configuration
How the community answered
(28 responses)- A89% (25)
- B4% (1)
- D7% (2)
Explanation
Cisco IOS XR uses a two-phase configuration model with a candidate (uncommitted) configuration and a running configuration. Any changes made in the CLI session are held in the candidate configuration and do NOT take effect until you explicitly issue the 'commit' command. Without committing, the new IP address is never applied to the running system, which is why the ping fails. This is a fundamental difference from IOS, where changes take effect immediately upon entry.
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