Dell Force10 S4820T FTOS Command Reference Guide - Page 1184

www.dell.com | support.dell.com • A primary VLAN can have any number of community VLANs and isolated VLANs. • Private VLANs block all traffic to isolated ports except traffic from promiscuous ports. Traffic received from an isolated port is forwarded only to promiscuous ports or trunk ports. Community VLAN: A community VLAN is a secondary VLAN of the primary VLAN: • Ports in a community VLAN can talk to each other. Also, all ports in a community VLAN can talk to all promiscuous ports in the primary VLAN and vice-versa. • Devices on a community VLAN can communicate with each other via member ports, while devices in an isolated VLAN cannot. Isolated VLAN: An isolated VLAN is a secondary VLAN of the primary VLAN: • Ports in an isolated VLAN cannot talk to each other. Servers would be mostly connected to isolated VLAN ports. • Isolated ports can talk to promiscuous ports in the primary VLAN, and vice-versa. Port types: • Community port: A community port is, by definition, a port that belongs to a community VLAN and is allowed to communicate with other ports in the same community VLAN and with promiscuous ports. • Isolated port: An isolated port is, by definition, a port that, in Layer 2, can only communicate with promiscuous ports that are in the same PVLAN. • Promiscuous port: A promiscuous port is, by definition, a port that is allowed to communicate with any other port type. • Trunk port: A trunk port, by definition, carries VLAN traffic across switches: • A trunk port in a PVLAN is always tagged. • Primary or secondary VLAN traffic is carried by the trunk port in tagged mode. The tag on the packet helps identify the VLAN to which the packet belongs. • A trunk port can also belong to a regular VLAN (non-private VLAN). ip local-proxy-arp c s Enable/disable Layer 3 communication between secondary VLANs in a private VLAN. Syntax [no] ip local-proxy-arp 1184 | Private VLAN (PVLAN)