1. On switch A, begin by configuring an IP address on the loopback interface lo0. This
will ensure MC-LAG will continue to function even if the inter-switch link or other
EX9208 fails:
EX9208A> configure
EX9208A# set interfaces lo0 unit 0 family inet address 192.18.40.2/24
2. Next, configure the inter-switch link:
EX9208A# set chassis aggregated-devices ethernet device-count 10
EX9208A# set interfaces xe-0/0/0 description "ICCP port to EX9208B"
EX9208A# set interfaces xe-0/0/0 unit 0 family inet address 192.18.39.1/24
EX9208A# set multi-chassis multi-chassis-protection 192.18.39.2 interface xe-
0/0/0
EX9208A# set protocols iccp local-ip-addr 192.18.39.1
EX9208A# set protocols iccp peer 192.18.39.2 session-establishment-hold-time 50
EX9208A# set protocols iccp peer 192.18.39.2 redundancy-group-id-list 1
EX9208A# set protocols iccp peer 192.18.39.2 backup-liveness-detection backup-
peer-ip 192.18.40.1
EX9208A# set protocols iccp peer 192.18.39.2 liveness-detection minimum-
receive-interval 60
EX9208A# set protocols iccp peer 192.18.39.2 liveness-detection transmit-
interval minimum-interval 60
3. Configure a link aggregation group ae1 for connection to the Cisco Catalyst 3850. In
this case the LAG is also a trunk that allows traffic for all VLANs, though VLAN
configuration is not required for MC-LAG to work:
EX9208A# set interfaces xe-0/3/0 description "MC-LAG to 3850"
EX9208A# set interfaces xe-0/3/0 ether-options 802.3ad ae1
EX9208A# set interfaces ae1 aggregated-ether-options lacp active
EX9208A# set interfaces ae1 aggregated-ether-options lacp system-id
00:01:02:03:04:05
EX9208A# set interfaces ae1 aggregated-ether-options lacp admin-key 3
EX9208A# set interfaces ae1 aggregated-ether-options mc-ae mc-ae-id 3
EX9208A# set interfaces ae1 aggregated-ether-options mc-ae redundancy-group
1
EX9208A# set interfaces ae1 aggregated-ether-options mc-ae chassis-id 0
EX9208A# set interfaces ae1 aggregated-ether-options mc-ae mode active-
active
EX9208A# set interfaces ae1 aggregated-ether-options mc-ae status-control
active
EX9208A# set interfaces ae1 unit 0 family ethernet-switching interface-mode
trunk
EX9208A# set interfaces ae1 unit 0 family ethernet-switching vlan members
all
4. Configure a link aggregation group ae2 for connection to the Cisco Nexus 7010. In
this case the LAG is also a trunk that allows traffic for all VLANs, though VLAN
configuration is not required for MC-LAG to work:
EX9208A# set interfaces xe-0/0/5 description "MC-LAG to 7010"
EX9208A# set interfaces xe-0/0/5 ether-options 802.3ad ae2
EX9208A# set interfaces ae2 aggregated-ether-options lacp active
EX9208A# set interfaces ae2 aggregated-ether-options lacp system-id
00:01:02:03:04:05
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