Administrator Guide

Figure 135. Sample Conguration for a VLT Proxy Gateway
Guidelines for Enabling the VLT Proxy Gateway
Keep the following points in mind when you enable a VLT proxy gateway:
• Proxy gateway is supported only for VLT; for example, across a VLT domain.
• You must enable the VLT peer-routing command for the VLT proxy gateway to function.
• Asymmetric virtual local area network (VLAN) conguration, such as the same VLAN congured with Layer 2 (L2) mode on one VLT
domain and L3 mode on another VLT domain is not supported. You must always congure the same mode for the VLANs across the
VLT domain.
• You must maintain VLAN symmetry within a VLT domain.
• The connection between DCs must be a L3 VLT in eVLT format . For more information, refer to the eVLT Conguration Example
• The trace route across the DCs can show extra hops.
• To ensure no trac drops, you must maintain route symmetry across the VLT domains. When the routing table across DCs is not
symmetrical, there is a possibility of a routing miss by a DC that does not have the route for L3 trac. Because routing protocols are
enabled and both DCs are in the same subnet, there is no dynamic route asymmetry. But if you congure a static route on one DC and
not on the other, there is asymmetry.
• If the port-channel specied in the proxy-gateway command is not a VLT LAG, the conguration is rejected by the CLI.
VLT Proxy Gateway
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