Configuring Multi-chassis Link Aggregation MCLAG Configuration Examples
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 10-37
Example 2: MCLAG Group ID Configuration
The following sample MCLAG network topology consists of two multi-chassis peer groups that are each
connected to an edge device through MCLAG aggregates:
In this sample topology, virtual IP interfaces are configured on the MCLAG aggregates. The same virtual
MAC address (00:00:5E:00:02:01) is generated for each of these IP interfaces. If these IP interfaces are
created on the same VLAN for both of the multi-chassis peer groups, this may cause a duplicate MAC
address condition within the network.
To ensure that a globally unique MAC address is assigned to each MCLAG virtual IP interface, configure
the multi-chassis group ID on each switch within each MCLAG group. For example, the following
diagram shows the same topology but with the group ID configuration added:
The group ID is appended to the virtual MAC address generated for each MCLAG virtual IP interface,
thus making each address unique within the network to avoid a duplicate MAC address scenario. For more
information about configuring the multi-chassis group ID, see the “MCLAG Configuration Guidelines” on
page 10-27.
The topology used in this sample MCLAG configuration is only one of many examples in which a dupli-
cate MAC address condition can occur. Configuring a unique group ID for each multi-chassis group is
recommended for all MCLAG topologies.
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