Borders are the entry and exit point for the Fabric, there are different types based on what type of network domain they are connecting to. Cisco DNA Center allows you to configure Border options in Provision > Fabric.
In Cisco DNAC 1.2, there were following Border options to be configured for SD-Access fabric:
- Internal Border (a Border that connects to known IP prefixes/ Rest of Company)
- External Border (a Border that connects to unknown prefixes/Outside World)
- Internal + External Border (a Border that connects to unknown and known prefixes/Anywhere).
In Cisco DNAC 1.3, there is only one "Border Node" selection. Within the "Border Node" configuration, different selections have to be made to make the border: Internal only, External only, or Internal+External.
To configure border as an Internal only, External only or Internal+External do the following:
- Initially without any configuration, a border is an "External" border.
- To configure Border as "External" border, check "Default to all Virtual Networks" and "Do not import external routes"
- To configure Border as "Internal + External" border, check "Default to all Virtual Networks" and uncheck "Do not import external routes".
- "Connected to internet" option is only applicable in the case of "SD-Access Transit".
The mapping between old options and the new is as below:
For more information, please refer to this Cisco Live session, "Cisco SD-Access - Connecting to the Data Center, Firewall, WAN and More ! - BRKCRS-2821"
Also, for more information about Borders and Transits refer to following articles: