Administrator Guide

coordinating between the two VLT chassis. IGMP and VLT configurations must be identical on both sides of
the trunk to ensure the same behavior on both sides.
Figure 120. Virtual Link Trunking
Multi-domain VLT
A multi-domain VLT (mVLT) configuration creates a port channel between two VLT domains by allowing two
different VLT domains, using different VLT Domain ID numbers, connected by a standard LACP LAG to form a
loop-free Layer 2 topology in the aggregation layer.
This configuration supports a maximum of four (4) nodes per mVLT domain, increasing the number of
available ports and allowing for dual redundancy of the VLT.
Additionally, a VLT domain that is a member of one mVLT can be used in another mVLT configuration with a
different VLT domain. Routing protocols such as OSPF are not compatible with mVLT; however, VLT domains
can be used for routing. A separate Layer 3 router is not required for inter-VLAN communication.
Virtual Link Trunking (VLT) 952