Switching

The port link aggregation is not up between Cisco switch and Juniper switch. Below is the configuration. Anything not right? Please advise. Many thanks.

Juniper:

  ge-0/0/46 {
        enable;
        ether-options {
            802.3ad ae0;
        }
    }
    ge-0/0/47 {
        enable;
        ether-options {
            802.3ad ae0;
        }
    }

   ae0 {
        mtu 1500;
        aggregated-ether-options {
            lacp {
                active;
                periodic fast;
            }
        }
        unit 0 {
            family ethernet-switching {
                port-mode trunk;
                vlan {
                    members all;
                }
            }
        }
    }

Cisco:

interface FastEthernet0/21
 switchport trunk encapsulation dot1q
 switchport mode trunk

channel-protocol lacp
 channel-group 1 mode active

interface FastEthernet0/22
 switchport trunk encapsulation dot1q
 switchport mode trunk

channel-protocol lacp
 channel-group 1 mode active

interface Port-channel1
 switchport trunk encapsulation dot1q
 switchport mode trunk

"interface FastEthernet0/21"

looks like the CISCO is 10x100 (fe) and juniper is 10x100x1000 (ge) so you would need to set the juniper ports to 100 mb

# set ge-0/0/46 and 47 ether-options speed 100mb

I don't know if LAG can be configured for such low speeds, but that may be the problem.

Verify that the MTU on CISCO is 1500 also