Alpha's does/did not support area routing.
Really?! Look at Identification and Type lines.
From day 1 on Alpha.
$ ncp sho exe char
Node Volatile Characteristics as of 3-MAY-2018 13:18:11
Executor node = 3.47 (RVDSXL)
Identification = HP DECnet for OpenVMS Alpha
Management version = V4.0.0
Incoming timer = 45
Outgoing timer = 60
Incoming Proxy = Enabled
Outgoing Proxy = Enabled
NSP version = V4.1.0
Maximum links = 32
Delay factor = 80
Delay weight = 5
Inactivity timer = 60
Retransmit factor = 10
Routing version = V2.0.0
Type = area
Routing timer = 600
Broadcast routing timer = 180
Maximum address = 1023
Maximum circuits = 16
Maximum cost = 1022
Maximum hops = 30
Maximum visits = 63
Maximum area = 63
Max broadcast nonrouters = 64
Max broadcast routers = 32
Maximum path splits = 1
Area maximum cost = 1022
Area maximum hops = 30
Maximum buffers = 100
Buffer size = 576
Default access = incoming and outgoing
Pipeline quota = 4032
Alias maximum links = 32
Path split policy = Normal
Maximum Declared Objects = 31
$
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Regards, Rok