Use Postman to configure CSR1000v router on Cisco Sandbox with RESTCONF

August 23rd, 2021 in ENCOR Knowledge

Postman and RESTCONF are two topics that we need to grasp in the ENCOR exam so in this tutorial we will learn the basis about them. In order to complete this tutorial, please download and install Postman first. This is a simple task so we will not mention it here.

After installing Postman, go to this Postman link and export the Cisco IOS-XE collection to a file on your local drive because we are going to communicate to a Cisco IOS XE router via Postman.



Embedded Event Manager (EEM) Tutorial

April 29th, 2021 in ENCOR Knowledge

EEM (Embedded Event Manager) is a software component of Cisco that allows network administrators to automate many tasks. EEM is like a programming language with “if {condition} then {action}” statement. If your condition is met then some “actions” will be performed automatically on the device.

An EEM consists of two major components:
+ Event: Defines the event to be monitored
+ Action: Defines action to be taken when the event is triggered

There are three steps to creating an EEM applet.
Step 1. Create the applet and give it a name with the command “event manager applet applet-name
Step 2 (Optional). Tell the applet what to look out for (just optional as some applets do not need to look out anything), usually with “event cli pattern” command
Step 3. Define action to be taken when the event is triggered in step 2, usually with “action” or “set” command.


LISP Tutorial

October 16th, 2020 in ENCOR Knowledge

In the Internet nowadays, the IPv4 or IPv6 address of a device represents both its identity and location. When a host moves from one location to another location, it is assigned a different IPv4 or IPv6 address, which overloads the location/identity semantic. We can say routing in the Internet today is like putting direction signs about every city in the world at every crossing.

Locator ID Separation Protocol (LISP) solves this issue by separating the location and identity of a device through the Routing locator (RLOC) and Endpoint identifier (EID):

+ Endpoint identifiers (EIDs) – assigned to end hosts.
+ Routing locators (RLOCs) – assigned to devices (primarily routers) that make up the global routing system.

With LISP, the change in location of a device does not result in a change in its identity. In other words, when the device moves from one location to another, it still keeps its IPv4 or IPv6 address, which is the EID part. Only the RLOC (which represents the IP address of the connected router) changes. In order to do so, LISP provides the distributed architecture EID-to-RLOC mapping that maps EIDs to RLOCs.