Cisco

The most basic form of packet capture, the destination of mirrored traffic configured by SPAN is another port on the local switch. The source of the packet capture can be one of the following interfaces: One or more specific switch ports An entire port channel All of the ports assigned to a VLAN There are…

Switched Port Analyser technologies give a network administrator the ability to see a copy of the traffic that is transmitted on the wire. The network device when configured with a SPAN technology will mirror all traffic at a data plane level for a specific criteria (port) to a destination. The destination could be a port…

It is possible to gather flows of network traffic as they traverse through devices. This can be useful for many reasons, for billing or for checking if traffic is flowing optimally through the network. This is done with Netflow, and requires two parts to be configured for it work, Netflow Data Capture and Netflow Data…

Devices can generate large amounts of information. The information can be sent to the device logging buffer, onto the console screen, or to a syslog server. Different logging levels can be set for all three. Level Definition Level Description syslog Definition emergencies 0 System Unstable LOG_EMERG alerts 1 Immediate Action Needed LOG_ALERT critical 2 Critical…

Simple Network Management Protocol (SNMP) provides a way for network engineers to get reactive alerts when something changes in the network. SNMP can be used to configure devices too, but this is less common. SNMP can send traps to a SNMP collector or network management system in response to a change that has happened in…

Debugging can provide important information to a network engineer when troubleshooting an issue. One of the important reasons for enabling debugging is to check at a deeper level why something is not working as it should be. Debugging can sometimes be too informational, so access lists can be used on some debug commands to restrict…

A traceroute is a common troubleshooting tool to determine where traffic goes to reach it’s destination. traceroute will show the IP address or DNS name of hops between the source and destination. It will demonstrates how long it has taken to reach each hop three times, each measured in milliseconds. A traceroute will display an…

Ping is one of the most useful tools in network troubleshooting. Testing reachability using the ping command (ping 192.168.1.254) can quickly offer insight into any network issues On a Cisco router, a successful ping response will be marked with a !; a ping time out will be marked with a . The success rate is…

Cisco SD-WAN can offer connectivity, zero-trust security, end to end segmentation and application-aware quality of service into infrastructure-as-a-service environments with SD-WAN cloud routers. Cisco SD-WAN allows multiple connectivity methods to be used to extend the SD-WAN fabric into multiple public cloud environments over any underlay transport network.

Software-as-a-service applications reside on the Internet, and to achieve the best experience for the user, the best performing internet exit point needs to be used. When Cloud OnRamp is configured for a software-as-a-service application within vManage; the SD-WAN router at remote sites will probe the software-as-a-service application with small HTTP requests through each exit SD-Router…