Un autre exemple en production :

Voici un exemple actuellement en production dans la société ou je travaille :

Init bsd sur slackware ...

Fichier /etc/rc.d/rc.vlan :

#!/bin/sh

echo "Bringing up vlan's ..."

/sbin/ifconfig eth0 down
/sbin/ifconfig eth0 0.0.0.0 up

# Campo-12 vlan
/sbin/vconfig add eth0 30

# Campo-30 vlan
/sbin/vconfig add eth0 40

# Chevaleret vlan
/sbin/vconfig add eth0 50

# Tolbiac vlan
/sbin/vconfig add eth0 60

# Activating Campo-12 vlan
/sbin/ifconfig eth0.30 10.1.3.253 netmask 255.255.255.0 broadcast 10.1.3.255 up

# Activating Campo-30 vlan
/sbin/ifconfig eth0.40 10.1.2.254 netmask 255.255.255.0 broadcast 10.1.2.255 up

# Activating Chevaleret vlan
/sbin/ifconfig eth0.50 10.1.4.254 netmask 255.255.255.0 broadcast 10.1.4.255 up

# Activating Tolbiac vlan
/sbin/ifconfig eth0.60 10.1.6.254 netmask 255.255.255.0 broadcast 10.1.6.255 up

# Adding routes to others subnets
/sbin/route add -net 10.1.1.0 netmask 255.255.255.0 gw 10.1.3.254
/sbin/route add -net 10.1.5.0 netmask 255.255.255.0 gw 10.1.3.254
/sbin/route add default gw 10.1.4.253

echo "Done ..."

# End vlan

--------------------------------------------------------------------------------------------

Les interfaces :

root@rtr-mikli:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:B0:D0:EC:E1:16
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2423877795 errors:0 dropped:0 overruns:325 frame:0
TX packets:1824982882 errors:0 dropped:0 overruns:0 carrier:17061
collisions:0 txqueuelen:1000
RX bytes:981160989 (935.7 Mb) TX bytes:1223687604 (1166.9 Mb)
Interrupt:5 Base address:0xec80

eth0.30 Link encap:Ethernet HWaddr 00:B0:D0:EC:E1:16
inet addr:10.1.3.253 Bcast:10.1.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:995157421 errors:0 dropped:0 overruns:0 frame:0
TX packets:620940096 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3267048197 (3115.6 Mb) TX bytes:3254979621 (3104.1 Mb)

eth0.40 Link encap:Ethernet HWaddr 00:B0:D0:EC:E1:16
inet addr:10.1.2.254 Bcast:10.1.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:158494634 errors:0 dropped:0 overruns:0 frame:0
TX packets:136381530 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:835029664 (796.3 Mb) TX bytes:2983220638 (2845.0 Mb)

eth0.50 Link encap:Ethernet HWaddr 00:B0:D0:EC:E1:16
inet addr:10.1.4.254 Bcast:10.1.4.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:732130423 errors:0 dropped:0 overruns:0 frame:0
TX packets:1067293605 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2610077458 (2489.1 Mb) TX bytes:1845438329 (1759.9 Mb)

eth0.60 Link encap:Ethernet HWaddr 00:B0:D0:EC:E1:16
inet addr:10.1.6.254 Bcast:10.1.6.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:245081 errors:0 dropped:0 overruns:0 frame:0
TX packets:363173 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:17168964 (16.3 Mb) TX bytes:341473843 (325.6 Mb)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:371295 errors:0 dropped:0 overruns:0 frame:0
TX packets:371295 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:42274973 (40.3 Mb) TX bytes:42274973 (40.3 Mb)

--------------------------------------------------------------------------------------------

Résultat de route :

root@rtr-mikli:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
network-10-1-4- * 255.255.255.0 U 0 0 0 eth0.50
network-10-1-5- rtr0-francetele 255.255.255.0 UG 0 0 0 eth0.30
network-10-1-6- * 255.255.255.0 U 0 0 0 eth0.60
network-10-1-1- rtr0-francetele 255.255.255.0 UG 0 0 0 eth0.30
network-10-1-2- * 255.255.255.0 U 0 0 0 eth0.40
network-10-1-3- * 255.255.255.0 U 0 0 0 eth0.30
loopback * 255.0.0.0 U 0 0 0 lo
default internet-gw.par 0.0.0.0 UG 0 0 0 eth0.50

--------------------------------------------------------------------------------------------

résultat de ip -r route :

root@rtr-mikli:~# ip -r route
10.1.4.0/24 dev eth0.50 proto kernel scope link src 10.1.4.254
10.1.5.0/24 via rtr0-francetelecom.paris-campo-12.mikli.france dev eth0.30
10.1.6.0/24 dev eth0.60 proto kernel scope link src 10.1.6.254
10.1.1.0/24 via rtr0-francetelecom.paris-campo-12.mikli.france dev eth0.30
10.1.2.0/24 dev eth0.40 proto kernel scope link src 10.1.2.254
10.1.3.0/24 dev eth0.30 proto kernel scope link src 10.1.3.253
127.0.0.0/8 dev lo scope link
default via internet-gw.paris-chevaleret.mikli.france dev eth0.50

Bien faire attention au niveau du switch à la configuration Egress Ports / Forbidden Egress Ports / Untagged Ports (isolation des vlan's) ...

A++