1. The above figure show a sample VLT Proxy gateway scenario. Their are no diagonal links in thesquare VLT connection between the C and D in VLT domain 1 and C1 and D1 in the VLT domain 2.This undergo sub-optimal routing with the VLT Proxy Gateway LLDP method. For VLT ProxyGateway to work in this scenario you must configure the , VLT-peer-mac transmit commandunder VLT Domain Proxy Gateway LLDP mode, in both C and D (VLT domain 1) and C1 and D1 (VLTdomain 2). This behavior is applicable only in the LLDP configuration and not required in the staticconfiguration. Sample ConfigurationDell(conf-vlt-domain)#proxy-gateway lldpDell(conf-vlt-domain-pxy-gw-lldp)#vlt-peer-mac transmit2. ICL shut – Assume ICL between C1 and D1 is shut and if D1 is secondary VLT one half of the inter DClink goes down. After vm motion, if a packet reaches D2 with the destination MAC address of D1, itmay be dropped. This behaviour is applicable only in the LLDP configuration; in the staticconfiguration, the packet is forwarded.3. Any L3 packet, when it gets an L3 hit and is routed because of this feature, has a TTL decrement asexpected.4. You can disable the VLT Proxy Gateway for a particular VLAN using an "Exclude-VLAN" configuration.The configuration has to be done in both the VLT domains [C and D in VLT domain 1 and C1 and D1in 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 10Static Configuration MethodDell(conf-vlt-domain)#proxy-gateway staticDell(conf-vlt-domain-pxy-gw-static)#remote-mac-address exclude-vlan 105. Packet duplication may happen with “Exclude-VLAN” configuration – Assume exclude-vlan (sayVLAN 10) is configured in C and D and in C1 and D1; If packets for VLAN 10 with C’s MAC address (Cis in VLT domain 1) gets an L3 hit at C1 in VLT domain 2, they are switched to both D1 (via ICL) and Cvia inter DC link. This may lead to packet duplication. If C’s MAC address is learned at C1, only (nothen) the packet is not have flooded (to D1) and only switched to C and thus packet duplication maybe avoided.6. With the existing hardware capabilities, you can only disable VLT Proxy Gateway only for 500 VLANs,using exclude-VLAN configuration.Configuring an LLDP VLT Proxy GatewayYou can configure a proxy gateway in a VLT domain to locally route packets destined to a L3 endpoint inanother VLT domain.To configure an LLDP proxy gateway:1. Enable VLT on a switch, then configure a VLT domain and enter VLT-Domain Configuration mode.CONFIGURATION modeDell(conf)#vlt domain domain-id2. Configure the LLDP proxy gateway.VLT DOMAIN modeDell(conf-vlt-domain)#proxy-gateway lldp3. You can configure the port channel interface for an LLDP proxy gateway and exclude a VLAN or arange of VLANs from proxy routing. This parameter is for an LLDP proxy gateway configuration.VLT Proxy Gateway 905
