8. Packet duplication – Assume exclude-vlan (say VLAN 10) is configured on C2/D2 for C1’s MAC. If
packets for VLAN 10 with C1’s MAC get a hit at C2, they will be switched to both D2 (via ICL) and C1
via inter DC link. This could lead to packet duplication. So, if C1’s MAC is learnt at C2 then the packet
would not have flooded (to D2) and only switched to C1 and thus avoided packet duplication.
Configuring an LLDP VLT Proxy Gateway
You can configure a proxy gateway in a VLT domain to locally route packets destined to a L3 endpoint in
another 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 mode
Dell(conf)#vlt domain domain-id
2. Configure the LLDP proxy gateway
VLT DOMAIN mode
Dell(conf-vlt-domain)#proxy-gateway lldp
3. You can configure the port channel interface for an LLDP proxy gateway and exclude a VLAN or a
range of VLANs from proxy routing. This parameter is for an LLDP proxy gateway configuration.
VLT DOMAIN PROXY GW LLDP mode
Dell(conf-vlt-domain-proxy-gw-lldp)#peer-domain-link port-channel interface
exclude-vlan vlan-range
4. Display the VLT proxy gateway configuration.
EXEC mode
Dell#show vlt-proxy-gateway
VLT Proxy Gateway 999