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What is the main purpose of promiscuous port in private VLANs?
Traffic received on primary VLAN enforces no separation and forwarding is done as in a normal VLAN. A promiscuous access port can serve only one primary VLAN and multiple secondary VLANs (community and isolated VLANs). With a promiscuous port, you can connect a wide range of devices as access points to a PVLAN.
What is a promiscuous port?
Promiscuous trunk port—A promiscuous port is an upstream trunk port connected to a router, firewall, server, or provider network. A promiscuous trunk port can communicate with all interfaces, including the isolated and community ports within a PVLAN.
How does a private VLAN work?
Private VLAN divides a VLAN (Primary) into sub-VLANs (Secondary) while keeping existing IP subnet and layer 3 configuration. A regular VLAN is a single broadcast domain, while private VLAN partitions one broadcast domain into multiple smaller broadcast subdomains.
What are three types of private VLAN domains?
There are three types of VLAN within a private VLAN:
- Primary VLAN – it forwards the traffic from the promiscuous ports to isolated ports, community ports and other promiscuous ports in the same private VLAN.
- Community VLAN – is a secondary VLAN.
- Isolated VLAN – is a secondary VLAN.
What are the three types of private VLANs?
Following are the three types of Private VLAN (PVLAN) ports. • Promiscuous Port: A promiscuous port can communicate with all interfaces inside the Private VLAN (PVLAN), including the isolated and community ports. • Isolated Port: An Isolated port cannot communicate with other ports within the same PVLAN, except the promiscuous ports.
When to use private VLAN Promiscuous host port?
Private VLAN Promiscuous Trunks are used in situations where a Private VLAN promiscuous host port is normally used but where it is necessary to carry multiple vlans, either normal vlans or for multiple Private VLAN domains. This makes it useful for connecting an upstream router that does not support Private VLANs.
Can a community VLAN communicate with a private VLAN?
They can communicate with a Promiscuous port within the same Private VLAN (PVLAN). • Community VLAN: The network devices attached to the ports associated with Community VLAN can communicate with one another. They can also communicate with a Promiscuous port within the Private VLAN (PVLAN).
How are isolated ports different from promiscuous ports?
• Isolated Port: An Isolated port cannot communicate with other ports within the same PVLAN, except the promiscuous ports. PVLANs block all traffic to isolated ports except traffic from promiscuous ports. • Community Port: Community ports can communicate among themselves and with the promiscuous ports.