Juniper – Setting Up Bridging with Multiple VLANs for EX Series Switches

book-software-ex-series-ethernet-switching.pdf

To segment traffic on a LAN into separate broadcast domains, you create separate virtual
LANs (VLANs) on an EX Series switch. Each VLAN is a collection of network nodes. When
you use VLANs, frames whose origin and destination are in the same VLAN are forwarded
only within the local VLAN, and only frames not destined for the local VLAN are forwarded
to other broadcast domains. VLANs thus limit the amount of traffic flowing across the entire LAN, reducing the possible number of collisions and packet retransmissions within
the LAN.
This example describes how to configure bridging for an EX Series switch and how to
create two VLANs to segment the LAN:

user@switch> show configuration
interfaces {
ge-0/0/0 {
unit 0 {
description “Sales wireless access point port”;
family ethernet-switching {
vlan members sales;
}
}
}
ge-0/0/3 {
unit 0 {
description “Sales phone port”;
family ethernet-switching {
vlan members sales;
}
}
}
ge-0/0/22 {
unit 0 {
description “Sales printer port”;
family ethernet-switching {
vlan members sales;
}
}
}
ge-0/0/20 {
unit 0 {
description “Sales file server port”;
family ethernet-switching {
vlan members sales;
}
}
}
ge-0/0/24 {
unit 0 {
description “Support wireless access point port”;
family ethernet-switching {
vlan members support;
}
}
}
ge-0/0/26 {
unit 0 {
description “Support phone port”;
family ethernet-switching {
vlan members support;
}
}
}
ge-0/0/44 {
unit 0 {
description “Support printer port”;
family ethernet-switching {
vlan members support;
}
}
}
ge-0/0/46 {
unit 0 {
description “Support file server port”;
family ethernet-switching {
vlan members support;
}
}
vlans {
unit 0 {
family inet address 192.0.2.0/25;
}
unit 1 {
family inet address 192.0.2.128/25;
}
}
}
}
vlans {
sales {
vlan-id 100;
interface ge-0/0/0.0:
interface ge-0/0/3/0;
interface ge-0/0/20.0;
interface ge-0/0/22.0;
l3-interface vlan 0;
}
support {
vlan-id 200;
interface ge-0/0/24.0:
interface ge-0/0/26.0;
interface ge-0/0/44.0;
interface ge-0/0/46.0;
l3-interface vlan 1;
}
}
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