Switching

Hello,

I'm trying configure link aggregation with LACP beetwen Juniper EX4200 and Cisco 3550(Llink aggregation works without LACP).

Juniper config:

ge-0/0/2 {
    ether-options {
        802.3ad ae0;
    }
}
ge-0/0/3 {
    ether-options {
        802.3ad ae0;
    }
}

.....

ae1 {
    aggregated-ether-options {
        minimum-links 1;
        link-speed 1g;
        lacp {
            passive;
            periodic fast;
        }
    }
    unit 0 {
        family ethernet-switching;
    }
}

Cisco config:

interface Port-channel1
 switchport mode dynamic desirable

....

interface GigabitEthernet0/11
 switchport mode dynamic desirable
 channel-group 1 mode active
!
interface GigabitEthernet0/12
 switchport mode dynamic desirable
 channel-group 1 mode active

And cisco says:

May 21 18:30:06.033: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
Cat3550-12G#sh lacp internal
May 21 18:30:07.033: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up
May 21 18:30:08.305: %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on GigabitEthernet0/12.
May 21 18:30:08.305: %PM-4-ERR_DISABLE: loopback error detected on Gi0/12, putting Gi0/12 in err-disable state
Cat3550-12G#sh lacp internal
May 21 18:30:08.337: %EC-5-COMPATIBLE: Gi0/11 is compatible with port-channel members
May 21 18:30:09.309: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to down
May 21 18:30:09.329: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to down

Output from cisco:

Cat3550-12G#show lacp 1 neighbor
Flags:  S - Device is requesting Slow LACPDUs
        F - Device is requesting Fast LACPDUs
        A - Device is in Active mode       P - Device is in Passive mode

Channel group 1 neighbors

Partner's information:

                  LACP port                        Oper    Port     Port
Port      Flags   Priority  Dev ID          Age    Key     Number   State
Gi0/11    SP      0         0000.0000.0000 138s    0x0     0x0      0x0
Gi0/12    SP      127       0019.e250.f900 132s    0x2     0x203    0x34



Cat3550-12G#show lacp 1 internal
Flags:  S - Device is requesting Slow LACPDUs
        F - Device is requesting Fast LACPDUs
        A - Device is in Active mode       P - Device is in Passive mode

Channel group 1
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi0/11    SA      indep     32768         0x1       0x1     0xC         0x7D
Gi0/12    SA      down      32768         0x1       0x1     0xD         0x5

From Juniper:

root@sw1# run show lacp interfaces
.....
Aggregated interface: ae1
    LACP state:       Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      ge-0/0/2       Actor    No   Yes    No   No   No   Yes     Slow   Passive
      ge-0/0/2     Partner    No   Yes    No   No   No   Yes     Fast   Passive
      ge-0/0/3       Actor    No   Yes    No   No   No   Yes     Slow   Passive
      ge-0/0/3     Partner    No   Yes    No   No   No   Yes     Fast   Passive
    LACP protocol:   Receive State    Transmit State           Mux State
      ge-0/0/2           Defaulted       No periodic            Detached
      ge-0/0/3       Port disabled       No periodic            Detached

Link aggregation between two EX 4200 work with LACP.

Please help me,

sorry for my bad english.