03-06-2009 05:33 AM - edited 03-06-2019 04:25 AM
Having an issue getting a vlan to work. I have a Cisco 2801 router configured with sub interfaces and have some questions. I have a 10.1.1.0 network which is Vlan 1 and a 10.1.2.0 network (both /24)Vlan 2 The switch is configured as a trunk on the uplink and on one port with Vlan 1 as native and Vlan 2 are on both ports. Vlan 1 works fine from the trunked port but Vlan 2 doesn't. Meening I can use a 10.1.1.0 address and ping but when I use a 10.1.2.0 address I cant ping the gateway on that network. Here is my router config:
interface FastEthernet0/1
description INSIDE INTERFACE - VLAN 1
ip address 10.1.1.1 255.255.255.0
ip access-group 110 in
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat inside
ip virtual-reassembly
ip policy route-map NO-NAT-STATIC-IP-FOR-VPN-CLIENTS
load-interval 30
speed 100
full-duplex
no cdp enable
!
interface FastEthernet0/1.2
description INSIDE INTERFACE Voice - VLAN 2
encapsulation dot1Q 2
ip address 10.1.2.1 255.255.255.0
ip helper-address 10.1.1.14
no cdp enable
Here is a sho ip int brie
Vlan1 unassigned YES NVRAM up down
Vlan2 unassigned YES unset up down
Vlan3 192.168.1.1 YES NVRAM up up
03-06-2009 05:41 AM
Hi
As a side not, the use of VLAN 1 is not recommended for data, see post below
hxxp://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=LAN%2C%20Switching%20and%20Routing&topicID=.ee71a04&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cd256f3
Try adding vlan 1 to a sub interface as well, just add native to the end of the encapsulation command.
interface FastEthernet0/1
speed 100
full-duplex
no cdp enable
FastEthernet0/1.1
description INSIDE INTERFACE - VLAN 1
encapsulation dot1Q 1 native
ip address 10.1.1.1 255.255.255.0
ip access-group 110 in
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat inside
ip virtual-reassembly
ip policy route-map NO-NAT-STATIC-IP-FOR-VPN-CLIENTS
load-interval 30
interface FastEthernet0/1.2
description INSIDE INTERFACE Voice - VLAN 2
encapsulation dot1Q 2
ip address 10.1.2.1 255.255.255.0
ip helper-address 10.1.1.14
no cdp enable
03-06-2009 06:04 AM
I'll give this a try.
03-06-2009 06:38 AM
In my opinion ur setup is not working because you have given IP to etherent port 0/1 and then you are assigning on more to its subinterface.
When you use subinterface you dont give ip to that port. You just define subinterface.
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