Hey guys,
need a little assistance here, not sure if i am totally off base here, and if this is normal to do something like this:
cisco catalyst 2960, cisco asa, 2 DSL modems from different providers:
DSL modem #1: plugged into catalyst on port 1
DSL modem #2: plugged into catalyst on port 2
ASA uplink for modem #1: plugged into catalyst on port 5
ASA uplink for modem #2: plugged into catalyst on port 6
the rest of the port on the switch using vlans like, 1/10/400
for different reasons i have no control over dsl modems, and all i get is a public ip from them. naturally, since it's only one switch i have, i have to separate networks, here is my approach (based on my understanding, TRUNK can carry only tagged traffic, with exception of native vlan, which can be untagged):
ports on catalyst: 1,2,5,6 are configured:
Interface FastEthernet 0/1, 0/5
switchport mode trunk
switchport native vlan 120
swithport trunk allowed vlan 120
Interface FastEthernet 0/2, 0/6
switchport mode trunk
switchport native vlan 122
swithport trunk allowed vlan 122
this in my mind should work (and actually worked for like a few years, untill vendor upgraded on of the DSL modems). What happen in this scenario is that both public networks are isolated on the switch with this configuration and no conflicts of overlaps.....
am i doing this ass-backwards ? please let me know your opinion.