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- Q3552974 subject Q7156067.
- Q3552974 subject Q8600286.
- Q3552974 abstract "Private VLAN, also known as port isolation, is a technique in computer networking where a VLAN contains switch ports that are restricted such that they can only communicate with a given "uplink". The restricted ports are called "private ports". Each private VLAN typically contains many private ports, and a single uplink. The uplink will typically be a port (or link aggregation group) connected to a router, firewall, server, provider network, or similar central resource.The switch forwards all frames received from a private port to the uplink port, regardless of VLAN ID or destination MAC address. Frames received from an uplink port are forwarded in the normal way (i.e. to the port hosting the destination MAC address, or to all ports of the VLAN for broadcast frames or for unknown destination MAC addresses). As a result, direct peer-to-peer traffic between peers through the switch is blocked, and any such communication must go through the uplink. While private VLANs provide isolation between peers at the data link layer, communication at higher layers may still be possible depending on further network configuration. A typical application for a private VLAN is a hotel or Ethernet to the home network where each room or apartment has a port for Internet access. Similar port isolation is used in Ethernet-based ADSL DSLAMs. Allowing direct data link layer communication between customer nodes would expose the local network to various security attacks, such as ARP spoofing, as well as increasing the potential for damage due to misconfiguration.Another application of private VLANs is to simplify IP address assignment. Ports can be isolated from each other at the data link layer (for security, performance, or other reasons), while belonging to the same IP subnet. In such a case direct communication between the IP hosts on the protected ports is only possible through the uplink connection by using MAC-Forced Forwarding or a similar Proxy ARP based solution.".
- Q3552974 thumbnail Private_VLAN_Traffic_Flow.jpg?width=300.
- Q3552974 wikiPageExternalLink www.cisco.com.
- Q3552974 wikiPageExternalLink usingpvlans.html.
- Q3552974 wikiPageExternalLink www.aristanetworks.com.
- Q3552974 wikiPageExternalLink www.brocade.com.
- Q3552974 wikiPageExternalLink www.extremenetworks.com.
- Q3552974 wikiPageExternalLink www.juniper.net.
- Q3552974 wikiPageExternalLink www.marathon-networks.com.
- Q3552974 wikiPageExternalLink www.microsoft.com.
- Q3552974 wikiPageExternalLink www.ubnt.com.
- Q3552974 wikiPageExternalLink distributed-switch.html.
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- Q3552974 wikiPageWikiLink Q7156067.
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- Q3552974 comment "Private VLAN, also known as port isolation, is a technique in computer networking where a VLAN contains switch ports that are restricted such that they can only communicate with a given "uplink". The restricted ports are called "private ports". Each private VLAN typically contains many private ports, and a single uplink.".
- Q3552974 label "Private VLAN".
- Q3552974 depiction Private_VLAN_Traffic_Flow.jpg.