How to Fix HSRP Group Number Rejection?

Refer to the exhibit. An engineer attempts to configure standby group 512 on interface GigabitEthernet0/1, but the configuration is not accepted. Which command resolves this problem? - image

  1. standby redirects
  2. standby 512 priority 100
  3. standby 512 preempt
  4. standby version 2 Source Reference Answer

Community Votes

D
100%

100% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

It tests your knowledge of default HSRP version constraints, where candidates often overlook that version 1 natively restricts groups to 255.

This question highlights the group number limitations between HSRP version 1 and version 2. The community unanimously confirms that switching to version 2 is required to accept group IDs beyond the 0–255 range.

Candidates frequently select priority or preempt options, mistakenly believing standard operational parameters are missing rather than recognizing the fundamental protocol version boundary.

Community Discussion (4 comments)

ciscoccie20 👍 14
Correct! In HSRP version 1, group numbers are restricted to the range from 0 to 255. HSRP version 2 expands the group number range from 0 to 4095.
KZM 👍 5 Selected: D
By default, HSRP operates using version 1 and supports standby group numbers ranging from 0 to 255. To utilize a group number such as 512, it's necessary to switch to version 2 using the command "standby version 2".
felix_simon 👍 1
D
chiacche 👍 1 Selected: D
standby 512 -> HSRP v1 0~255 -> HSRP v2 0~4095

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Expert Analysis

HSRP Version Limitations

By default, Cisco IOS runs HSRP version 1, which strictly limits standby group numbers to the range of 0 through 255. When an engineer attempts to configure standby 512, the CLI rejects the command because 512 exceeds this hard-coded limit.

Why Option D Resolves the Issue

Executing standby version 2 upgrades the protocol instance on that interface to HSRP version 2, which expands the supported group range to 0 through 4095. As noted by multiple candidates in the community feedback, this single command directly addresses the root cause without requiring additional parameter adjustments.

Why Other Options Fail

  • Option A (standby redirects) is unrelated to group numbering and typically pertains to ICMP redirect behaviors in specific routing scenarios.
  • Options B and C (priority and preempt) are valid HSRP tuning commands, but they cannot be applied until the group number itself is accepted by the running version. Configuring them first will still trigger a syntax rejection due to the invalid group ID.

Best Practices

Always verify the HSRP version before planning large-scale deployments. Version 2 also introduces changes to multicast addresses (224.0.0.102) and authentication methods, so ensure network-wide consistency when migrating.

Official Reference

Exam Strategy

When encountering configuration rejections on numeric identifiers, immediately verify the underlying protocol's version-specific limits before adding operational parameters. On the CCNP Enterprise exam, always consider default software behaviors first, as they frequently dictate whether a command will be accepted.

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