This post is about how to work with switching in GNS3.
Configuration on how to create VLAN:
SW4#vlan database
SW4(vlan)#vlan 10 name Data_VLAN
VLAN 10 added:
Name: Data_VLAN
SW4(vlan)#vlan 20 name Voice_VLAN
VLAN 20 added:
Name: Voice_VLAN
SW4(vlan)#vlan 100 name MGMT_VLAN
VLAN 100 added:
Name: MGMT_VLAN
SW4(vlan)#apply
APPLY completed.
SW4(vlan)#exit
To join interfaces to VLAN
SW4(config)#int range fa 0/3 - 5
SW4(config-if-range)#switchport access vlan 10
SW4(config-if-range)#switchport voice vlan 20
SW4(config-if-range)#spanning-tree portfast
SW4(config-if-range)#exit
To show the VLAN status
SW4#show vlan-switch brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14
10 Data_VLAN active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5
20 Voice_VLAN active
100 MGMT_VLAN active Fa0/15
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
SW4#
To save vlan configuration to vlan.dat and to make sure router retains vlan database after restarting GNS3
SW4#dir nvram:
Directory of nvram:/
123 -rw- 1536 <no date> startup-config
124 ---- 0 <no date> private-config
129016 bytes total (127428 bytes free)
SW4#config t
Enter configuration commands, one per line. End with CNTL/Z.
SW4(config)#vtp file nvram:vlan.dat
Setting device to store VLAN database at filename nvram:vlan.dat.
SW4(config)#do dir nvram:
Directory of nvram:/
123 -rw- 1536 <no date> startup-config
124 ---- 0 <no date> private-config
1 -rw- 780 <no date> vlan.dat
129016 bytes total (126404 bytes free)
SW4(config)#do wr mem
Building configuration...
[OK]
SW4(config)#
