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PAGP for Dual-Detection- port stay waiting to be aggregated

Hello,

We tried  to connect  4500X (Dist.)  VSS to 6509 (core) VSS via PAGP etherchannel,  like you can see in the output below some of the 4 ports are stay in " waiting to be aggregated" (w). 

At the 4500X all of the ports seems to be function properly (show etherchannel summary, all marked with "p"). 

When we change to LACP - all ports are UP and function properly - But we like to use the Dual Detection PAGP for the few 4500-X VSS pairs 

How  can we solve this issu?

thanks,

output:

 

6509_VSS#show etherchannel summary
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      N - not in use, no aggregation
        f - failed to allocate aggregator

        M - not in use, no aggregation due to minimum links not met
        m - not in use, port not aggregated due to minimum links not met
        u - unsuitable for bundling
        d - default port

        w - waiting to be aggregated
Number of channel-groups in use: 4
Number of aggregators:           4

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
2      Po2(SU)         PAgP      Te1/1/5(w)     Te1/1/6(w)     Te2/1/5(P)     
                                 Te2/1/6(P)     
3      Po3(SU)         PAgP      Te1/1/9(P)     Te1/1/10(P)    Te2/1/9(w)     
                                 Te2/1/10(w)    
10     Po10(RU)         -        Te1/5/4(P)     Te1/5/5(P)     
20     Po20(RU)         -        Te2/5/4(P)     Te2/5/5(P)     

6509_VSS#SHOW RUN int po3
Building configuration...

Current configuration : 93 bytes
!
interface Port-channel3
 description LAG_4500_VSS3
 switchport
 switchport mode trunk
end


6509_VSS#show run interface te1/1/9
Building configuration...

Current configuration : 131 bytes
!
interface TenGigabitEthernet1/1/9
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te2/1/9

interface TenGigabitEthernet2/1/9
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te1/1/10
Building configuration...


interface TenGigabitEthernet1/1/10
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te2/1/10
Building configuration...

Current configuration : 132 bytes
!
interface TenGigabitEthernet2/1/10
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show ver | inc image
System image file is "bootdisk:s2t54-advipservicesk9-mz.SPA.150-1.SY7.bin"
6509_VSS#

6509_VSS>
6509_VSS>en
Password: 
6509_VSS#show etherchannel summ
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      N - not in use, no aggregation
        f - failed to allocate aggregator

        M - not in use, no aggregation due to minimum links not met
        m - not in use, port not aggregated due to minimum links not met
        u - unsuitable for bundling
        d - default port

        w - waiting to be aggregated
Number of channel-groups in use: 4
Number of aggregators:           4

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
2      Po2(SU)         PAgP      Te1/1/5(w)     Te1/1/6(w)     Te2/1/5(P)     
                                 Te2/1/6(P)     
3      Po3(SU)         PAgP      Te1/1/9(P)     Te1/1/10(P)    Te2/1/9(w)     
                                 Te2/1/10(w)    
10     Po10(RU)         -        Te1/5/4(P)     Te1/5/5(P)     
20     Po20(RU)         -        Te2/5/4(P)     Te2/5/5(P)     

6509_VSS#SHOW RUN int po3
Building configuration...

Current configuration : 93 bytes
!
interface Port-channel3
 description LAG_4500_VSS3
 switchport
 switchport mode trunk
end

6509_VSS#show run int
6509_VSS#show run interface te1/1/9
Building configuration...

Current configuration : 131 bytes
!
interface TenGigabitEthernet1/1/9
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te2/1/9
Building configuration...

Current configuration : 131 bytes
!
interface TenGigabitEthernet2/1/9
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te1/1/10
Building configuration...

Current configuration : 132 bytes
!
interface TenGigabitEthernet1/1/10
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show run interface te2/1/10
Building configuration...

Current configuration : 132 bytes
!
interface TenGigabitEthernet2/1/10
 description LAG_VSS_3
 switchport
 switchport mode trunk
 channel-group 3 mode desirable
end

6509_VSS#show ver | inc image
System image file is "bootdisk:s2t54-advipservicesk9-mz.SPA.150-1.SY7.bin"
6509_VSS#

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