virtaul interfaces on 2821

mhasabal · ‎10-01-2009

can someone please help me to validate the following interface config:

!

interface GigabitEthernet0/0

description $CONNECTION TO LAN$

no ip address

duplex auto

speed 100

!

interface GigabitEthernet0/0.1

description $NATIVE_Data$

encapsulation dot1Q 1

ip address 172.20.1.254 255.255.255.0

ip nat inside

ip virtual-reassembly

!

interface GigabitEthernet0/0.20

description $CONFIG_CNTR$

encapsulation dot1Q

ip address 192.168.2.1 255.255.255.0

ip helper-address 192.168.200.254 {another DHCP server on HP switch trunked to cat3560 switch which is connected to the Cisco on GI0/0 as the voice switch}

ip nat inside

ip virtual-reassembly

!

interface GigabitEthernet0/0.50

description $VOICE$

encapsulation dot1Q

ip nat inside

ip virtual-reassembly

Q: do i need to give ip add to vlan 50 or i can just leave it part of the native vlan.

thank you in advance

paolo bevilacqua · ‎10-01-2009

You need a VLAN ID for each encapsulation dot1q, and an IP address for each subinterface.

You do not need "ip virtual-reassembly".

mhasabal · ‎10-01-2009

can i do:

vlan 1 for example: 172.20.2.0

vlan 20 192.168.2.0

vlan 50 172.20.1.0

under int .20 i have an ip add helper to point to another dhcp server, is that the way to do it?

thank you so much for your help.

paolo bevilacqua · ‎10-01-2009

Yes.

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