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352-001 · Question #124

Which network management tool should a network manager consult in order to pinpoint the cause of a routing recursion error?

The correct answer is A. debug (for BGP output). The debug command provides real-time, granular BGP event output necessary to identify a routing recursion failure, which cannot be captured with sufficient detail by logging or SNMP tools.

Designing Management and Operations

Question

Which network management tool should a network manager consult in order to pinpoint the cause of a routing recursion error?

Options

  • Adebug (for BGP output)
  • Bsyslog (for BGP errors)
  • CRMON events group
  • DSNMP routing traps

How the community answered

(49 responses)
  • A
    94% (46)
  • B
    2% (1)
  • D
    4% (2)

Why each option

The debug command provides real-time, granular BGP event output necessary to identify a routing recursion failure, which cannot be captured with sufficient detail by logging or SNMP tools.

Adebug (for BGP output)Correct

BGP debug commands such as 'debug ip bgp' display real-time, step-by-step BGP processing events including next-hop resolution and recursive lookup failures, giving the engineer the precise sequence of events needed to pinpoint a routing recursion error at the exact moment it occurs.

Bsyslog (for BGP errors)

Syslog records high-level error messages that may indicate a BGP problem occurred but lacks the per-event granularity required to trace the root cause of a recursive routing lookup failure.

CRMON events group

RMON events group monitors and captures network performance statistics and threshold events but has no mechanism to track or log BGP routing table recursion processing.

DSNMP routing traps

SNMP routing traps provide asynchronous notifications when routing changes occur but do not supply the detailed recursive lookup chain information needed to diagnose a recursion error.

Concept tested: Using BGP debug commands to diagnose routing recursion errors

Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/200253-Troubleshoot-BGP-with-Debug-Commands.html

Topics

#BGP debug#routing recursion#troubleshooting tools#network diagnostics

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