Teldat SA
Chapter 11 Examples
11.1 PVST+
11.1.1 Scenario
This scenario shows three switches joined to a loop so that, if a failure occurs, there is an alternative route for the
data. If you want each switch to act as the root for each of the VLANs used, use 20, 21 and 30.
Scenario
Fig. 2:
3 devices are used:
• Juniper EX4200 (Bridge ID= 00:1f:12:3f:c6:c0).
• Atlas i60 (Bridge ID= 00:a0:26:a2:00:42).
• Cisco Catalyst 3560 (Bridge ID= 00:12:da:e1:21:80).
Device IPs for VLAN
Vlan
Vlan 20
Vlan 21
Vlan 30
Spanning tree priorities for VLAN:
PVST+
Vlan 20
Vlan 21
Vlan 30
11.1.2 Configuration
The first step is to create the Ethernet subinterfaces and associate the IP addresses and the VLANs that use them.
network ethernet0/0.20
; -- Ethernet Subinterface Configuration --
ip address 172.16.10.2 255.255.255.0
;
encapsulation dot1q 20
;
exit
;
LAN Interfaces
EX4200
172.16.10.1
172.16.12.1
172.16.30.1
Root
Priority Ex4200
Catalyst 3560
4096
Atlas i60
8192
Juniper EX4200
0
Atlas i60
172.16.10.2
172.16.12.2
172.16.30.2
Catalyst 3560
0
4096
8192
Catalyst 3560
172.16.10.3
172.16.12.3
172.16.30.3
Teldat Atlas i60
8192
0
4096
11 Examples
101
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