Figure 135. VLT on Core SwitchesThe aggregation layer is mostly in the L2/L3 switching/routing layer. For better resiliency in the aggregation, Dell Networking recommendsrunning the internal gateway protocol (IGP) on the VLTi VLAN to synchronize the L3 routing table across the two nodes on a VLT system.Enhanced VLTEnhanced VLT (eVLT)) refers to the ability to connect two VLT domains. An eVLT configuration creates a port channel between two VLTdomains by allowing two different VLT domains, using different VLT domain ID numbers, connected by a standard link aggregation controlprotocol (LACP) LAG to form a loop-free Layer 2 topology in the aggregation layer.This configuration supports a maximum of four switches, increasing the number of available ports and allowing for dual redundancy of theVLT. The following example shows how the core/aggregation port density in the Layer 2 topology is increased using eVLT. For inter-VLANrouting, you do not need a separate router.If you enable peer routing in an eVLT topology, a VLT node acts as a proxy gateway for its peer within the VLT domain. You can alsoconfigure the two VLT domains to act as proxy gateways for each other. For more details, see the VLT Proxy Gateway chapter.Virtual Link Trunking (VLT) 923
