Ethernet Switching on EX Series Switches - Juniper Networks

<strong>Ethernet</strong> <strong>Switching</strong> on EX Series Switches
all secondary VLANs belong to the same IP subnet because the subnet is allocated to
the primary VLAN. Hosts within the secondary VLAN are assigned IP addresses based
on IP subnets associated with the primary VLAN, and their IP subnet masking information
reflects that of the primary VLAN subnet.
PVLANs Use Four Different <strong>Ethernet</strong> Switch Port Types
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PVLANs isolate ports within the same broadcast domain. To do this, four different kinds
of PVLAN ports are used, with different restrictions for different situations.
For example, the network in Figure 4 on page 17 shows a PVLAN spanning multiple
switches, where the primary VLAN (100) contains two community domains (300 and
400) and one interswitch isolated domain. This configuration requires one type of port
to transport all information to the router, another type to connect the finance and HR
communities to their respective switches, a third type of port to connect the servers, and
a fourth type of port to connect the two switches.
Figure 5: PVLAN Spanning Multiple Switches
VLAN 100
VLAN 400
HR
Community
VLAN 300
Finance Community
Switch 1
VLAN 200
Isolated Domain
PVLAN Trunk
Contains VLAN 100,VLAN 200,
VLAN 300, and VLAN 400.
VLAN 300 VLAN 400
Finance
Community
Switch 2
VLAN 200
Mail server Backup server CVS server
Isolated Domain
HR
Community
g020909
Router
PVLANs use four different port configurations to meet these different needs. The network
depicted above uses a promiscuous port to transport information to the router, community
ports to connect the finance and HR communities to their respective switches, isolated
ports to connect the servers, and a PVLAN trunk port to connect the two switches. These
ports have different restrictions to fit different situations:
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