Juniper Networks EX2500 User Manual

VLAN Topologies and Design Considerations

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Chapter 2: VLANs

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All ports that are involved in port mirroring must have memberships in the 
same VLANs. If a port is configured for port mirroring, the port’s VLAN 
membership cannot be changed. For more information on configuring port 
mirroring, see “Monitoring Ports with Port Mirroring” on page 81. 

Figure 6 shows a sample network consisting of an EX2500 switch configured with 
multiple VLANs with VLAN-tagged gigabit adapters.

Figure 6:  Sample Network with Multiple VLANs

The multiple VLANs example in Figure 6 is described in Table 8.  

Server 1

VLAN 1

Server 2

VLAN 1

Server 3

VLAN 2

Server 4

VLAN 3

Server 5

VLAN 1, 2

Enterprise

Routing Switch

Enterprise

Routing Switch

EX2500

Switch

Table 8:  Components of Sample Network with Multiple VLANs  (1 of 2)

Component

Description

EX2500 switch

This switch is configured with three VLANs that represent three different IP subnets. Five ports are 
connected downstream to servers. Two ports are connected upstream to routing switches. 

Uplink ports are members of all three VLANs, with VLAN tagging enabled. 

Server 1

This server is a member of VLAN 1 and has presence in only one IP subnet. The associated switch port is 
only a member of VLAN 1, so tagging is disabled. 

Server 2 

This server is a member of VLAN 1 and has presence in only one IP subnet. The associated switch port is 
only a member of VLAN 1, so tagging is disabled. 

Server 3

This server belongs to VLAN 2, and it is logically in the same IP subnet as Server 5. 

The associated switch port has tagging disabled. 

Server 4

A member of VLAN 3, this server can communicate only with other servers via a router. 

The associated switch port has tagging disabled.