Routing Instances
Quiz: https://networkdirection.net/labsandquizzes/quizzes/juniper-jncia/routing-instances
Lab: https://networkdirection.net/labsandquizzes/labs/jncia-labs/routing-instances
Notes
In the Cisco world, you can use VRF-Lite to create additional routing tables on a router or L3 switch. This creates separation at layer-3 like VLANs do at layer-2.
Juniper have something similar (although not identical) called a routing instance.
There are several types of routing instance, depending on how they should be used.
The ‘Virtual Router’ and ‘No-Forwarding’ types are the closest to VRF-Lite. Virtual router creates an additional routing table and an additional forwarding table.
The no-forwarding type creates an additional routing table, but the best routes still end up in the global forwarding table. You might use this if you want to create multiple instances of OSPF or some other routing protocol.
Other routing instance types include:
- VRF – MPLS Network
- L2VPN – VPLS Network
- Forwarding – Filter-Based Forwarding (FBF; Like Cisco’s PBR)
Command Summary
| Command | Mode | Description |
| set routing-instances NAME instance-type TYPE | Configuration | Create a routing instance |
| set routing-instances NAME interface | Configuration | Assign interfaces to a routing instance |
| set routing-instances NAME routing-options static route NETWORK next-hop IP | Configuration | Add a static route to a routing instance |
| show route instance | Operational | See the routing instances |
| show route table INSTANCE.inet.0 | Operational | See the routing table for the routing instance |
Additional References
Routing Instances Overview
https://www.juniper.net/documentation/en_US/junos/topics/concept/routing-instances-overview.html
Juniper Routing Instances