Hi,
I inherited networking environment in an office and I'm trying to understand a few things.
Basically I have 2 switch catalyst connected through a trunk port. One port from the main switch (configured as a trunk too) is connected with an ASA firewall.
If I do "sh interfaces trunk" on the main switch I get:
=================================================
Port Mode Encapsulation Status Native vlan
Fa0/1 on 802.1q trunking 1
Fa0/11 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/1 1-4094
Fa0/11 10-15,20
Port Vlans allowed and active in management domain
Fa0/1 1,5,11,40,50,9-15,20,999
Fa0/11 10-15-20
Port Vlans in spanning tree forwarding state and not pruned
Fa0/1 1,5,11,40,50,9-15,20,999
Fa0/11 10-15,20
=================================================
The Fa0/1 port is trunk to secondary switch.
The Fa0/11 port is trunk to firewall.
And I don't understand why only few vlan are trunked to firewall through that port (Fa0/11).
The main problem is that I configured a port in switch02 with vlan12 and it doesn't work.
cable is ok, link is up and protocol is up. I think the problem is trunk because on the same switch vlan12 works well.
I have many other vlan configured on switches and they trunk ok (for example vlan9).
On the main switch if I try a : "sh int fa0/15 trunk" (fa0/15 configured as vlan12)
Port Mode Encapsulation Status Native vlan
Fa0/15 auto negotiate not-trunking 1
Port Vlans allowed on trunk
Fa0/15 12
Port Vlans allowed and active in management domain
Fa0/15 12
Port Vlans in spanning tree forwarding state and not pruned
Fa0/15 12
status is "not-trunking" but I can't really understand why. Is it related to firewall trunk ?
Can you please help ?
Thanks.
