Linux router connected to a cisco switch fiber gigabyte

I'm trying to connect a card to a cisco switch following the linux vlan howto.
I can't make it work. PCs attached to the switch are unable to see the linux.
The PCs are connected with RJ45 ethernet and the linux with Fiber Gb.

Once the device is up I connect a PC to a port in the swithc and I tcpdump -i
eth3.11 and I watch what does when I ping.
I can't see no icmp packets, only this arps:
13:48:57.302567 arp who-has frodo tell roetb01
I expected to see some 802.1q or CDP.

This is the linux interface:
iface eth3.11 inet static
pre-up /sbin/ifconfig eth3 0.0.0.0 up ; /sbin/vconfig add eth3 11
address 192.168.1.1
netmask 255.255.255.0
broadcast 192.168.1.255

This are the switch interfaces: WS-C3524-XL-EN
Inteface F0/1
switchport access vlan 11

Interface G0/1
switchport trunk encapsulation dot1q
switchport trunk vlan 1,11,1002-1005
switchport mode trunk

I also tried getting rid of the vlan in the switch and the linux but
I can see no difference.

Any hints ?