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300-410 · Question #62

While troubleshooting connectivity issues to a router, these details are noticed: - Standard pings to all router interfaces, including loopbacks, are successful. - Data traffic is unaffected. - SNMP c

The correct answer is A. Show policy-map control-plane. Intermittent SNMP connectivity, while other traffic is unaffected, strongly suggests that Control Plane Policing (CoPP) is dropping or rate-limiting SNMP packets. The show policy-map control-plane command is crucial for troubleshooting this by displaying statistics for the CoPP p

Infrastructure Security

Question

While troubleshooting connectivity issues to a router, these details are noticed: - Standard pings to all router interfaces, including loopbacks, are successful. - Data traffic is unaffected. - SNMP connectivity is intermittent. Which command must be configured first to troubleshoot this issue?

Options

  • AShow policy-map control-plane
  • BShow policy-map
  • CShow interface inc drop
  • DShow ip route

How the community answered

(31 responses)
  • A
    84% (26)
  • B
    3% (1)
  • C
    3% (1)
  • D
    10% (3)

Why each option

Intermittent SNMP connectivity, while other traffic is unaffected, strongly suggests that Control Plane Policing (CoPP) is dropping or rate-limiting SNMP packets. The `show policy-map control-plane` command is crucial for troubleshooting this by displaying statistics for the CoPP policy.

AShow policy-map control-planeCorrect

The symptoms of successful pings and data traffic but intermittent SNMP connectivity are characteristic of Control Plane Policing (CoPP) dropping or rate-limiting packets destined for the router's control plane. SNMP traffic is processed by the control plane, making `show policy-map control-plane` the most relevant command to check for dropped packets and policy statistics first.

BShow policy-map

`show policy-map` typically displays policy maps applied to interfaces for QoS, which is less likely to specifically cause intermittent SNMP issues while other traffic passes unaffected.

CShow interface inc drop

`show interface inc drop` (or a similar command) provides general interface drop statistics, but it doesn't specifically point to a control plane policing issue as the root cause for intermittent SNMP.

DShow ip route

`show ip route` displays the routing table. Since standard pings to all interfaces and data traffic are successful, routing is clearly functional and unlikely to be the cause of intermittent SNMP.

Concept tested: Control Plane Policing Troubleshooting

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/15-mt/qos-plcshp-15-mt-book/qos-plcshp-copp.html

Topics

#Control Plane Policing#SNMP Troubleshooting#Router Protection#Control Plane

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