subnet, there is no dynamic route asymmetry. But if you configure a static route on one DC and noton the other, there is asymmetry.• If the port-channel specified in the proxy-gateway command is not a VLT LAG, the configuration isrejected by the CLI.• You cannot change the VLT LAG to a legacy LAG when it is part of proxy-gateway.• You cannot change the link layer discovery protocol (LLDP) port channel interface to a legacy LAGwhen you enable a proxy gateway.• Dell Networking recommends the vlt-peer-mac transmit command only for square VLTswithout diagonal links.• The virtual router redundancy (VRRP) protocol and IPv6 routing is not supported.• Private VLANs (PVLANs) are not supported.• When a Virtual Machine (VM) moves from one VLT domain to the another VLT domain, the VM hostsends the gratuitous ARP (GARP) , which in-turn triggers a mac movement from the previous VLTdomain to the newer VLT domain.• After a station move, if the host sends a TTL1 packet destined to its gateway; for example, a previousVLT node, the packet can be dropped.• After a station move, if the host first PINGs its gateway; for example, a previous VLT node it results in a40 to 60% success rate considering it takes a longer path.• When you remove and add back a MAC address, L3 frames can be received out-of-order at the L3cloud. This happens when proxy gateway routing and sub-optimal routing intersperse with eachother.Enabling the VLT Proxy GatewayTo enable the VLT proxy gateway, the system mac addresses of C and D in the local VLT domain must beinstalled in C1 and D1 in the remote VLT domain and vice versa. You can install the mac address in twomethods - the proxy-gateway lldp method or the proxy-gateway static configuration. Proxy-gateway LLDP is a dynamic method of installing the local mac addresses in the remote VLT domain,which is achieved using a new organizational type, length, value (TLV) in LLDP packets.You can configure the VLT proxy gateway in a VLT domain using the proxy-gateway LLDP commandin proxy-gateway Configuration mode. Specify the port-channel interface of the square VLT link onwhich LLDP packets are sent using thepeer-domain-link port-channel command.Configuring the proxy gateway lldp and the peer-domain-link port channel, LLDP sets TLV flagson the interfaces for receiving and transmitting private TLV packets. After defining these organizationalTLV settings, LLDP encodes the local system mac-addresses as organizational TLVs for transmitting tothe peer. If you specify the no proxy gateway LLDP interface command, LLDP stops transmittingand receiving proxy gateway TLV packets on the specified interfaces. However, other TLVs are notaffected. From the interfaces on which you enabled the proxy gateway LLDP, LLDP decodes the TLVpackets from the remote LLDP by using the new organizational TLV.The following requirements must be satisfied for LLDP proxy gateway to function correctly:• Data centers must be directly connected.• LLDP has a limited TLV size. As a result, information that is carried by the new TLV is limited to one ortwo MAC addresses.• You must have all related systems properly configured and set up.VLT Proxy Gateway 919
