Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1867

Table 253: Components of the Topology for Configuring RSTP on EX Series Switches
Property
Switch 1
Switch 2
Switch 3
Switch 4
VLAN names and tag IDs
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The following ports on Switch 1 are connected in this way:
is connected to Switch 2
ge-0/0/9
is connected to Switch 4
ge-0/0/13
ge-0/0/11 is connected to Switch 3
The following ports on Switch 2 are connected in this way:
is connected to Switch 1
ge-0/0/14
is connected to Switch 3
ge-0/0/18
The following ports on Switch 3 are connected in this way:
is connected to Switch 1
ge-0/0/26
is connected to Switch 2
ge-0/0/28
is connected to Switch 4
ge-0/0/24
The following ports on Switch 4 are connected in this way:
is connected to Switch 1
ge-0/0/19
is connected to Switch 3
ge-0/0/23
voice-vlan , tag 10
, tag
employee-vlan 20
, tag
guest-vlan 30
, tag
camera-vlan 40
This configuration example creates a loop-free topology between four EX Series switches
using RSTP.
An RSTP topology contains ports that have specific roles:
The root port is responsible for forwarding data to the root bridge.
The alternate port is a standby port for the root port. When a root port goes down, the
alternate port becomes the active root port.
The designated port forwards data to the downstream network segment or device.
The backup port is a backup port for the designated port. When a designated port goes
down, the backup port becomes the active designated port and starts forwarding data.
NOTE: You also can create a loop-free topology between the aggregation
layer and the distribution layer using redundant trunk links. For more
information about configuring redundant trunk links, see "Example:
Configuring Redundant Trunk Links for Faster Recovery" on page 1563.
Chapter 71: Examples of Spanning-Tree Protocols Configuration
1763