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VLT Proxy Gateway
You can configure a proxy gateway in VLT domains. A proxy gateway enables you to locally route the
packets that are destined to a L3 endpoint in another VLT domain.
Proxy Gateway in VLT Domains
Using a proxy gateway, the VLT peers in a domain can route the L3 packets destined for VLT peers in
another domain as long as they have L3 reachability of these IP destinations.
A proxy gateway in a VLT domain provides the following benefits:
• Avoid sub-optimal routing of packets by a VLT domain when packets are destined to the endpoint in
another VLT domain.
• Provide resiliency if a VLT peer goes down by performing proxy routing for the peer’s DA MAC in
another VLT domain.
A typical scenario is virtual movement of servers across data centers. Virtual movement enables live
migration of running virtual machines from one host to another without a downtime. Consider a square
VLT connecting two data centers. If a VM, say VM1 on Server Rack 1 has C as its default gateway and VM1
performs a virtual movement to Server Rack 2 with no change in default gateway, then L3 packets
destined for C can be routed either C1 or D1 locally. This behavior is achieved by installing the local_DA
entries for C/D in C1/D1 so that the packets for C/D could have a hit at C1/D1 and routed locally.
In the following figure, server racks, named Rack 1 and Rack 2 are part of data centers, named DC1 and
DC2 respectively. Rack 1 is connected to devices A and B in Layer 2. Similarly, Rack 2 is connected to
devices A and B in Layer 2. A VLT LAG is present between A and B. A and B are connected to core routers,
C and D. VLT routing is present between C and D. C1 and D1 are Layer 3 routers in DC2 and they are
connected with core routers, C and D. The core or Layer 3 routers are then part of a Layer 3 cloud.
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VLT Proxy Gateway