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
Question
Options
- AShow policy-map control-plane
- BShow policy-map
- CShow interface inc drop
- DShow ip route
How the community answered
(31 responses)- A84% (26)
- B3% (1)
- C3% (1)
- D10% (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.
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.
`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.
`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.
`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
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