You must select the VRF for global IPv4 or IPv6 options before entering commands; not all Global Router parameters are configurable on other VRF instances.
Layer 1 and Layer 2 information (including VLAN information) is global and is not maintained for each VRF instance. However, you can associate a set of VLANs with a VRF instance.
A VLAN cannot belong to more than one VRF instance at a time. When you create a VLAN, more than one physical port can belong to it. You can associate a VRF instance with more than one IPv4 or IPv6 interface (a physical Ethernet port or a VLAN).
Perform physical port assignment at the VLAN and brouter port level. A VRF instance inherits all the ports assigned to its VLANs and brouter ports. You cannot directly assign a physical port to a VRF instance, but it is implicitly assigned when you associate the VRF with VLANs or brouter ports.
For IPv4, after you configure interVRF route redistribution between two VRF instances, avoid overlapping IP addresses between these two VRF instances.
When you configure VRF Lite, remember the following rules:
You can connect two VRFs from the same system with an external cable.
An IPv4 or IPv6 routable VLAN can become a member of a VRF.
An IPv4 or IPv6 interface can belong to only one VRF.
A VRF can exist even if no interfaces are assigned to it.
Routing policies apply to VRFs on an individual basis.
Multiple VRFs on the same node can function in different autonomous systems.
Following rules apply to IPv4 interfaces specifically:
If you configure an IPv4 interface without specifying the VRF instance, it is mapped to VRF 0 by default.
VRF Lite supports SMLT and RSMLT.
VRF Lite supports RIP in and out policies.
VRF Lite supports OSPF in and out (accept and redistribute) policies.
Before you delete a VRF instance, disable OSPF. Deleting a VRF instance deletes the OSPF instance if OSPF is disabled.
When you create a VRF instance, an OSPF instance is not automatically created. To activate OSPF on a VRF instance, first create an OSPF instance, and then enable OSPF.
You can configure a VRF so it can have IP interfaces with OSPF, RIP, static routes, and policies simultaneously.
Every IPv4 interface is a member of VRF 0 unless explicitly defined to belong to another VRF.