Partition Route domain and VLAN no available

It's good to understand that partitons and route domains are not the same. Route domains are used like VRFs to create network segregation. Partitions however, are used to create administrative segregation. These are frequently used together (assign a default route domain to a partition) for ease of use.

Here are the steps that you could try:

1. Create a new route domain (for example id 100)
2. Create a new partition (for example and use id 100 as Partition Default Route Domain
3. Select your newly created partition.
4. Create new vlans in your newly created partition (they will be automaticaly assigned to RD 100).

It's okay if you just want to use only 1 VLAN in your route domain.