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To learn more about configuring routing protocols and policies, see the
Junos OS Routing
Protocols Configuration Guide
at
http://www.juniper.net/techpubs/software/junos/
Related
Documentation
Understanding Layer 2 Protocol Tunneling on J-EX Series Switches on page 1056
•
•
Understanding Multiple VLAN Registration Protocol (MVRP) on J-EX Series Switches
on page 1054
•
Example: Setting Up Basic Bridging and a VLAN for a J-EX Series Switch on page 1063
•
Example: Setting Up Bridging with Multiple VLANs for J-EX Series Switches on page 1070
•
Example: Configure Automatic VLAN Administration Using GVRP on page 1087
•
Example: Connecting an Access Switch to a Distribution Switch on page 1078
Understanding Private VLANs on J-EX Series Switches
The private VLAN (PVLAN) feature on J-EX Series Switches allows an administrator to
split a broadcast domain into multiple isolated broadcast subdomains, essentially putting
a VLAN inside a VLAN. Just like regular VLANs, PVLANs are isolated on Layer 2 and require
that a Layer 3 device be used to route traffic among them. Private VLANs are useful for
restricting the flow of broadcast and unknown unicast traffic and for limiting the
communication between known hosts.
NOTE:
Configuring a voice over IP (VoIP) VLAN on PVLAN interfaces is not
supported.
In a private VLAN, one VLAN is designated the primary VLAN, and other VLANs are nested
inside that VLAN as secondary VLANs.
•
Primary—A VLAN used to forward frames downstream to isolated and community
VLANs.
•
Isolated—A secondary VLAN that receives packets only from the primary VLAN and
forwards frames upstream to the primary VLAN.
•
Community—A secondary VLAN that transports frames among community interfaces
within the same community and forwards frames upstream to the primary VLAN.
Private VLANs provide IP address conservation and efficient allocation of those IP
addresses. In a typical network, VLANs usually correspond to a single IP subnet. In private
VLANs, the hosts in all the secondary VLANs still belong to the same IP subnet as the
subnet allocated to the primary VLAN. Hosts within the secondary VLAN are numbered
out of IP subnets associated with the primary VLAN, and their IP subnet masking
information reflects that of the primary VLAN subnet. Any primary routed VLAN interfaces
(RVIs) perform functions similar to proxy ARP to enable communication between hosts
that are members of a different secondary VLAN.
1047
Chapter 57: Bridging and VLANs—Overview
Summary of Contents for PowerConnect J-EX8208
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