Static route with a next-hop of next-table pointing to the appropriate routing table which contains more accurate information rib-groups to mirror routing information from one route-table to another. However, in many cases, in order to make this work, interface-routes also need to be mirrored. RIB Group policy can be used to constrain the routing information instance-import and instance-export statements configured within the individual routing-instances to leak routes from one table to another. Again, policy can be used here to constrain the routing information. This method is more straightforward than the rib-group method A final approach is to use physical interfaces or logical- tunnels to stitch routing-instances and use a routing protocol or static routes across this connection between the two routing-instances.
To share routes between two routing instances on a Junos device, you can configure an instance import policy in one or both instances to import routes from the other instance. Alternatively, a RIB (Routing Information Base) group can be used to share routes between instances.

BGP uses a router ID that is always a 32-bit value, even when BGP is operating for IPv6 address families.
BGP supports both 16-bit and 32-bit Autonomous System Numbers through the use of four-byte ASN extensions, allowing ASNs to be represented using a 32-bit value.

For IS-IS to form adjacencies, the 'family iso' statement must be configured on the interface. This is required because IS-IS operates over the connectionless network service (CLNS) and not over IP. Without the 'family iso' configuration, IS-IS cannot form adjacencies over the interface.

The aggregate route is 10.16.2.0/23. A /23 prefix covers the address range from 10.16.2.0 through 10.16.3.255. Therefore, any destination within that range will match the aggregate route.
The address 10.16.3.79 falls within this range, so packets destined for that address match the aggregate route.