Pvlan Broadcast Domains - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos

PVLAN Broadcast Domains

802.1Q Tags Within PVLANs
1508
®
OS for EX Series Ethernet Switches, Release 10.4
A PVLAN is designated the primary VLAN, and other VLANs are nested inside that VLAN
as secondary VLANs. The types of PVLAN broadcast domains are:
Primary VLAN—VLAN used to forward frames downstream to isolated and community
VLANs.
Isolated VLAN—(When a PVLAN is configured on only one switch) A secondary VLAN
that receives packets only from the primary VLAN and forwards frames upstream to
the primary VLAN.
Inter-switch isolated VLAN—(When a PVLAN is configured to span multiple switches)
A secondary (internal) VLAN that is used to forward isolated VLAN traffic from one
switch to another through pvlan-trunk ports.
Community VLAN—A secondary VLAN that transports frames among community
interfaces within the same community and forwards frames upstream to the primary
VLAN.
The primary VLAN of the PVLAN must be associated with an 802.1Q tag regardless of
whether the PVLAN is configured on a single switch or is configured to span multiple
switches. However, you do not need 802.1Q tags for secondary VLANs when a PVLAN is
configured on a single switch.
When a PVLAN spans multiple switches:
Specify an 802.1Q tag for each community VLAN by setting
Specify the 802.1Q tag for the inter-switch isolated VLAN by setting
Figure 35 on page 1509 shows a PVLAN spanning multiple switches, where the primary
VLAN ( ) contains two community domains
100
isolated domain.
.
vlan-id
isolation-id
and ) and one inter-switch
(300 400
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