[j-nsp] trouble setting up link agg between clustered SRX 550 and Cisco 6509

[Andy Litzinger]

Has anyone had any difficulty creating a port channel between an SRX cluster (in this case, SRX 550s) and Cisco switches (in this case 6509s, non-VSS)?

When I tried to bring up a second link in the link agg group the cisco side put it in state "I" which means:  standalone.  It also logged this message:
%EC-SP-5-CANNOT_BUNDLE_LACP: Gi8/2 is not compatible with aggregators in channel 10 and cannot attach to them (flow control send of Gi8/2 is on, Gi8/1 is off)

I did some googling and found a couple articles that seemed to say that the SRX doesn't support flow-control so I tried turning it off on the cisco side.:
interface 8/1 flowcontrol send off
interface 8/2 flowcontrol send off
interface po10 flowconftorl send off

This didn't help and when I shut/no shut the port channel on the cisco side the whole thing went offline and wouldn't come back until I rebuilt it.

any ideas?

SRX-A connects to 6509-A with 2 physical links bundled into reth0
SRX-B connects to 6509-B with 2 physical links bundled into reth0

SRX side config:
>show configuration interfaces ge-0/0/4
gigether-options {
    redundant-parent reth0;
}
> show configuration interfaces ge-0/0/6
gigether-options {
    redundant-parent reth0;
}
> show configuration interfaces ge-9/0/4
gigether-options {
    redundant-parent reth0;
}
> show configuration interfaces ge-9/0/6
gigether-options {
    redundant-parent reth0;
}

> show configuration interfaces reth0
vlan-tagging;
redundant-ether-options {
    redundancy-group 1;
    lacp {
        active;
        periodic fast;
    }
}
unit x {
    vlan-id x;
    family inet {
        address x.x.x.x/zz;
    }
}
unit y {
    vlan-id y;
    family inet {
        address x.x.x.x/zz;
    }
}


cisco side on 6509-A:
interface GigabitEthernet8/1
description srx01-g0/4
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan x,y
switchport mode trunk
switchport nonegotiate
spanning-tree portfast edge trunk
channel-group 10 mode active
end

interface GigabitEthernet8/2
description srx01-g0/6
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan x,y
switchport mode trunk
switchport nonegotiate
shutdown
spanning-tree portfast edge trunk
channel-group 10 mode passive
end

interface Port-channel10
description srx01-internal
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan x,y
switchport mode trunk
switchport nonegotiate
spanning-tree portfast edge trunk
end

the 6509-B config is identical

thanks!
-andy