Summary-address not-advertise Filtering type5

Hi all,

summary address not-advertise command shoul only filter out the type 7 lsa, but I can see it filtering the type 5. Here is my set up

r2---Area0----r4------Area46------r6-----Connected

I am redistributing the connected from r6 into OSPF and I can see them coming in as E2

r4(config-router)#do sh ip route ospf | inc 66.
O E2 192.168.66.0/24 [110/20] via 192.168.46.6, 00:01:30, FastEthernet0/1.46
r4(config-router)#

I am now summrising on R6 with a /17

r6(config-router)#summary-address 192.168.0.0 255.255.128.0

r4(config-router)#do sh ip route ospf | inc 168.0
O E2 192.168.0.0/17 [110/20] via 192.168.46.6, 00:00:23, FastEthernet0/1.46

All good.

If I add the not-advertise keyword to r6 summary command, the summary is no longer there

r6(config-router)#summary-address 192.168.0.0 255.255.128.0 not-advertise

r4(config-router)#do sh ip route ospf | inc 168.0
r4(config-router)#

?????

Am I missing something or the command is not doing what it says on tin?

Fulvio