CCNP ENARSI 300-410 Exam Cram Notes

4.0 Infrastructure Services

4.6 Troubleshoot NetFlow (v5, v9, flexible NetFlow)

show ip cache flow: Displays a summary of the NetFlow switching statistics.

show ip flow interface: Displays NetFlow switching configuration for interfaces.

show ip flow export: Displays the current NetFlow configuration

show flow timeout: Displays information about NetFlow timeouts

NetFlow collection is enabled on an interface-by -interface basis, and it is unidirectional. This means you can enable it to capture traffic inbound on an interface with the ip flow ingress command or outbound on an interface with the ip flow egress command.

Flexible NetFlow is basically an extension of NetFlow v9.  Flexible NetFlow provides enhanced optimization, reduces costs and improves capacity planning and security detection beyond traditional flow technologies. Flexible NetFlow, similar to traditional Netflow, requires CEF to be enabled for IPv4 and IPv6. So, if you are using NetFlow for IPv4, the command ip cef is required, and if you are using NetFlow for IPv6, the command ipv6 cef is required. Use the commands show ip cef and show ipv6 cef to verify whether NetFlow for IPv4 and IPv6 are running.

You can verify the version of NetFlow that is being used for export by using the "show ip flow export" command. To display the status and the statistics, including the main cache and all other enabled caches, use the "show ip flow export" command in user EXEC or privileged EXEC mode.

4.7 Troubleshoot network problems using Cisco DNA Center assurance (connectivity, monitoring, device health, network health)

Cisco DNA Assurance delivers comprehensive network visibility. With it, you can easily manage all your connected devices and services, prioritize and resolve network issues with the help of machine learning, and ensure a better user experience across the network.

Categories in All Issues of Cisco DNA Center Assurance is as follows

1. Onboarding - Displays the wireless and wired client onboarding issues.

2. Connectivity- Displays network connectivity issues, such as OSPF, BGP tunnels, and so on.

3. Connected- Displays issues related to clients.

4. Device - Displays device-related issues, such as CPU, memory, fan, and so on.

5. Availability- Displays device availability issues for APs, wireless controllers, and so on.

6. Utilization- Displays utilization issues of APs, wireless controllers, radios,and so on.

7. Application - Displays Application Experience issues.

8. Sensor Test- Displays sensor global issues.

A troubleshooting feature in DNA Center Assurance ,with Path Trace, you can graphically see the path that applications and services running on a client will take through all the devices on the network to reach the destination.

Device 360 and client 360: An Assurance feature allowing viewing and troubleshooting devices or clients from any angle or context. These features display information about the topology, throughput, and latency from various times and applications so you can get a detailed view on the performance of the specific device or client over a specified period.

Network Time Travel: Allows the operator to see device or client performance in a timeline view to understand the network state when an issue occurred. Allows an operator to go back in time up to 14 days and see the cause of a network issue, instead of trying to re-create the issue in a lab.

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