The user of an Alcatel-Lucent 7750 SR wants to see the effect of changing an import policy immediately. What is the best command to force re-evaluation of the import policy with minimal impact?

Question

Options

• AConfigure router bgp shutdown
• BClear router bgp neighbor <ip-address> soft
• CClear router bgp neighbor <ip-address> soft-inbound
• DClear router bgp protocol

• A
  10% (4)
• B
  3% (1)
• C
  85% (33)
• D
  3% (1)

Explanation

soft-inbound is the precise tool for import policy changes because it forces the router to re-process all routes stored in the Adj-RIB-In (the locally cached received routes) through the updated import policy - without tearing down the BGP session or requesting the neighbor to resend anything, making it the least disruptive option.

Why the distractors are wrong:

• A (BGP shutdown) is the most destructive option - it drops all BGP sessions and withdraws all routes, the opposite of "minimal impact."
• B (soft) performs a soft reset that typically sends a ROUTE-REFRESH to the neighbor, requesting it to resend routes; this works but is less targeted than soft-inbound since it may trigger outbound re-advertisement as well, adding unnecessary churn when you only changed the import policy.
• D (clear bgp protocol) resets the entire BGP process instance, disrupting all neighbors - far too broad for a single policy tweak.

Memory tip: Match the direction to the policy type - Import = Inbound. When you change an import policy, use soft-**inbound** to re-evaluate it. If you changed an export policy, you'd use soft (outbound) instead.

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