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vlan trunking with defaut vlan

I have a asa5505 with default vlan connected to two 2950s. I need to trunk the vlans on the upstream asa5505 in order to move phones on to different vlan on the 2950s.

How can I maintain the default network that the devices are currently connected to the switch? Do I need to use native vlan?

asa: (staged)

interface Ethernet0/2

description uplink-staged

switchport allowed vlan 50,80,100,200,500,800

switchport trunk native vlan 100

switchport mode trunk

asa: (current)

interface Ethernet0/1

description uplink

switchport access vlan 100

2950:

VLAN Name                             Status    Ports

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

1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/7, Fa0/8

                                                Fa0/9, Fa0/10, Fa0/11, Fa0/12, Fa0/13, Fa0/14

                                                Fa0/15, Fa0/16, Fa0/17, Fa0/20, Fa0/21, Fa0/22

                                                Gi0/1, Gi0/2

50   guest                          active   

80   prod                           active   

100  prod                          active   

200  voice                         active   

500  serv                          active    Fa0/6

800  mgmt                          active   

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