Configuring Multi-Chassis Link Aggregation
On MX-series routers, multi-chassis link aggregation (MC-LAG) enables a device to form a logical LAG interface with two or more other devices. MC-LAG provides additional benefits over traditional LAG in terms of node level redundancy, multi-homing support, and loop-free Layer2 network without running Spanning Tree Protocol (STP). MC-LAG can be configured for VPLS routing instance, CCC application, and Layer 2 circuit encapsulation types.
The MC-LAG devices use Inter-Chassis Control Protocol (ICCP) to exchange the control information between two MC-LAG network devices.
On one end of MC-LAG is an MC-LAG client device that has one or more physical links in a link aggregation group (LAG). This client device does not need to be aware of MC-LAG. On the other side of MC-LAG are two MC-LAG network devices. Each of these network devices has one or more physical links connected to a single client device. The network devices coordinate with each other to ensure that data traffic is forwarded properly.
To enable MC-LAG, include the mc-ae statement at the [edit interfaces aeX aggregated-ether-options] hierarchy level along with either the encapsulation ethernet-ccc or encapsulation ethernet-vpls statement at the [edit interfaces aeX] hierarchy level:
To delete an MC-LAG interface from the configuration, issue the delete interfaces aeX aggregated-ether-options mc-ae command at the [edit] hierarchy level in configuration mode:
