Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1104

port mode mismatches occur. Also, you can view these discrepancies if any occur by using the show vlt mismatch command. Interoperation of VLT Nodes in a PVLAN with ARP Requests When an ARP request is received, and the following conditions are applicable, the IP stack performs certain operations. • The VLAN on which the ARP request is received is a secondary VLAN (community or isolated VLAN). • Layer 3 communication between secondary VLANs in a private VLAN is enabled by using the ip local-proxy-arp command in INTERFACE VLAN configuration mode. • The ARP request is not received on the ICL Under such conditions, the IP stack performs the following operations: • The ARP reply is sent with the MAC address of the primary VLAN. • The ARP request packet originates on the primary VLAN for the intended destination IP address. The ARP request received on ICLs are not proxied, even if they are received with a secondary VLAN tag. This behavior change occurs because the node from which the ARP request was forwarded would have replied with its MAC address, and the current node discards the ARP request. Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN The following table illustrates the association of the VLTi link and PVLANs, and the MAC synchronization of VLT nodes in a PVLAN (for various modes of operations of the VLT peers): Table 95. VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN VLT LAG Mode Peer1 Peer2 Trunk Trunk PVLAN Mode of VLT VLAN Peer1 Peer2 Primary Primary ICL VLAN Membership Yes Mac Synchronization Yes Trunk Trunk Primary Normal No No Trunk Trunk Normal Normal Yes Yes Promiscuo Trunk Primary Primary Yes No us Trunk Access Primary Secondary No No Promiscuo Promiscuo Primary Primary Yes Yes us us Promiscuo Access Primary Secondary No No us Promiscuo Promiscuo Primary Primary Yes Yes us us 1104 Virtual Link Trunking (VLT)