Concept Guide
Proxy Gateway with VRRP
VLT proxy gateway solves the inecient trac trombone problem when VLANs are extended between date centers and when VMs are
migrated between the two DCs. Starting from Dell EMC Networking OS 9.14.0.0, VRRP provides a much simpler method to solve the trac
trombone problem.
This is achieved by conguring same VRRP group IDs to the extended L3 VLANs and VRRP stays active-active across all four VLT nodes
even though they are in two dierent VLT domains.
The following illustration shows a sample conguration with two data centers:
• Server racks, Rack 1 and Rack 2, are part of data centers DC1 and DC2, respectively.
• Rack 1 is connected to devices A1 and B1 in a Layer 2 network segment.
• Rack 2 is connected to devices A2 and B2 in a Layer 2 network segment.
• A VLT link aggregation group (LAG) is present between A1 and B1 as well as A2 and B2.
• A1 and B1 are connected to core routers, C1 and D1 with VLT routing enabled.
• A2 and B2 are connected to core routers, C2 and D2, with VLT routing enabled.
• The core routers C1 and D1 in the local VLT domain are connected to the core routers C2 and D2 in the remote VLT Domain using VLT
links.
Virtual Router Redundancy Protocol (VRRP)
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