• Any L3 packet, when it gets an L3 hit and is routed, it has a time to live (TTL) decrement as expected.• You can disable the VLT Proxy Gateway for a particular VLAN using an "Exclude-VLAN" configuration. The configuration has to be donein both the VLT domains [C and D in VLT domain 1 and C1 and D1 in VLT domain 2].Sample Configuration LLDP MethodDell(conf-vlt-domain)#proxy-gateway llDell(conf-vlt-domain-pxy-gw-lldp)#peer-domain-link port-channel 1 exclude-vlan 10Sample Configuration Static MethodDell(conf-vlt-domain)#proxy-gateway staticDell(conf-vlt-domain-pxy-gw-static)#remote-mac-address exclude-vlan 10• Packet duplication may happen with “Exclude-VLAN” configuration – Assume you used the exclude-vlan option (called VLAN 10)in C and D and in C1 and D1; If packets for VLAN 10 with C’s MAC address (C is in VLT domain 1) gets an L3 hit at C1 in VLT domain 2,they are switched to both D1 (via ICL) and C via inter DC link. This may lead to packet duplication. Therefore, if C’s MAC address islearned at C1, the packet does not flood to D1 and only switches to C and avoids packet duplication.• With the existing hardware capabilities, you can only disable VLT Proxy Gateway only for 500 VLANs, using exclude-VLANconfiguration.Configuring a Static VLT Proxy GatewayYou can configure a proxy gateway in VLT domains. A proxy gateway allows you to locally route the packets that are destined to an L3endpoint of the other VLT domain.Apply the following configurations in the Core L3 Routers C and D in local VLT domain and C1 and D1 in the remote VLT domain:1 Configure proxy-gateway static in VLT Domain Configuration mode.2 Configure remote-mac-address in VLT Domain Proxy Gateway LLDP mode. Configure the system mac-addresses of both C and D in C1 and also in D1 in the remote VLT domain and vice versa.Sample Static Configuration on C switch or C1 switchSwitch_C#confSwitch_C(conf)#vlt domain 1Switch_C(conf-vlt-domain1)#proxy-gateway staticSwitch_C(conf-vlt-domain1-pxy-gw-static)#remote-mac-address ....Configuring an LLDP VLT Proxy GatewayYou can configure a proxy gateway in a VLT domain to locally route packets destined to a L3 endpoint in another VLT domain.Apply the following configurations in the Core L3 Routers C and D in the local VLT domain and C1 and D1 in the remote VLT domain:1 Configure proxy-gateway lldp in VLT Domain Configuration mode.2 Configure peer-domain-link port-channel in VLT Domain Proxy Gateway LLDP mode. TheVLT port channel is the one that connects the remote VLT domain.Sample Dynamic Proxy Configuration on C switch or C1 switchSwitch_C#confSwitch_C(conf)#vlt domain 1Switch_C(conf-vlt-domain1)#proxy-gateway lldpSwitch_C(conf-vlt-domain1-pxy-gw-lldp)#peer-domain-link port-channel 1....VLT Proxy Gateway Sample TopologyVLT proxy gateway enables one VLT domain to act as proxy gateway for another VLT domain when a host or virtual machine is moved fromone VLT domain to the other VLT domain.The following image depicts a sample topology in which VLT proxy gateway is configured.1048 VLT Proxy Gateway
