spanning-tree portfast on interface enabled [do you agree?]

- spanning-tree portfast on interface enabled
portfast--->immiedietely jump from blocking to forwarding state [omnit listening
            and learning]
portfast--->don't block bpdu frames!
sw1
interface FastEthernet0/3
 switchport access vlan 3
 switchport mode access
 spanning-tree portfast
---
general topology
            <------------------------bpdu
            <------------------------data

sw3[fa0/1]----------[fa0/2]sw1[fa0/1]----------[fa0/1]sw2

         bpdu------------------------->
          data------------------------->
---
option 1
 sw1 don't receive bpdu on fa0/1 and than:
 > keep portfast behaviore
 > all the time sw1 will send bpdu out of fa0/1 port to sw2
 > accept received bpdu couse stp rebuild, after rebuild we will have
   to options, which can touch sw1 fa0/1 port:
   1 port will be still in forward state and:
     > bpdu send and receive
     > data send and receive
---
                                        X didn't receive bpdu
            <------------------------data

sw3[fa0/1]----------[fa0/2]sw1[fa0/1]----------[fa0/1]sw2

         bpdu------------------------->
          data------------------------->
---
   2 port will be blocked, because stp decide this and:
     > bpdu send and receive
     > data blocked
---
            <------------------------bpdu
                             X<---------data

sw3[fa0/1]----------[fa0/2]sw1[fa0/1]----------[fa0/1]sw2

         bpdu------------------------->
          data--------->X
---
option 2
 sw1 receive bpdu on fa0/1 and than:
 > keep portfast behaviore
 > all the time sw1 will send bpdu out of fa0/1 port to sw2
 > accept received bpdu couse stp rebuild, after rebuild we will
   have to options, which can touch sw1 fa0/1 port:
   1 port will be still in forward state and:
     > bpdu send and receive
     > data send and receive
---
            <------------------------bpdu
            <------------------------data

sw3[fa0/1]----------[fa0/2]sw1[fa0/1]----------[fa0/1]sw2

         bpdu------------------------->
          data------------------------->
---
   2 port will be blocked, because stp decide this and:
     > bpdu send and receive
     > data blocked
---
            <------------------------bpdu
                             X<---------data

sw3[fa0/1]----------[fa0/2]sw1[fa0/1]----------[fa0/1]sw2

         bpdu------------------------->
          data--------->X
---