Solved: Cisco 850 - multiple LAN subnets per FastEthernet

MichaelMacMillan · ‎09-09-2008

Hi all;

Can anyone please tell me whether they know if the Cisco 850's support configuring different LAN IP subnets, per FastEthernet switch port? I worked with a Cisco 837 which couldn't (although enabling the DMZ functionality did give extra segment).

PS. If it can't, how about the Cisco 870's?-

Thank you

alalli · ‎09-10-2008

Hi Michael,

Here is a link to the config guide for 850/870 routers.

http://www.cisco.com/en/US/docs/routers/access/800/850/software/configuration/guide/dhcpvlan.html

Basically, what you need to do is to

1. create the vlan database

router1(config)#vlan database

2. create layer 2 vlans

router1(config)#vlan 2 name network_mgmt

router1(config)#vlan 3 name data

router1(config)#vlan 4 name voice

3. Assign L2 vlans to a port on the switch.

router1(config)#

int Fast2

switchport access vlan 2

int Fast3

switchport access vlan 3

int Fast4

switchport access vlan 4

4. create layer 3 vlan interfaces for routing.

int vlan 2

ip address 192.168.2.254 255.255.255.0

no shut

int vlan 3

ip address 192.168.3.254 255.255.255.0

no shut

int vlan 4

ip address 192.168.4.254 255.255.255.0

no shut

Hope this helps :)

View solution in original post

alalli · ‎09-10-2008

Hi Michael,

Here is a link to the config guide for 850/870 routers.

http://www.cisco.com/en/US/docs/routers/access/800/850/software/configuration/guide/dhcpvlan.html

Basically, what you need to do is to

1. create the vlan database

router1(config)#vlan database

2. create layer 2 vlans

router1(config)#vlan 2 name network_mgmt

router1(config)#vlan 3 name data

router1(config)#vlan 4 name voice

3. Assign L2 vlans to a port on the switch.

router1(config)#

int Fast2

switchport access vlan 2

int Fast3

switchport access vlan 3

int Fast4

switchport access vlan 4

4. create layer 3 vlan interfaces for routing.

int vlan 2

ip address 192.168.2.254 255.255.255.0

no shut

int vlan 3

ip address 192.168.3.254 255.255.255.0

no shut

int vlan 4

ip address 192.168.4.254 255.255.255.0

no shut

Hope this helps :)

MichaelMacMillan · ‎09-11-2008

Your reply helps absolutely, thank you very much!

I take it from the FAQ

http://www.cisco.com/en/US/prod/collateral/routers/ps380/ps6200/prod_qas0900aecd8028a982.html

that since the 805 Series can handle only 1 VLAN; one'd need need a Cisco 870 Series (with the plus feature) set to implement VLANS above.

Thank you for time! :)

Very appreciated.

alalli · ‎09-10-2008

Hi Michael,

Here is a link to the config guide for 850/870 routers.

http://www.cisco.com/en/US/docs/routers/access/800/850/software/configuration/guide/dhcpvlan.html

Basically, what you need to do is to

1. create the vlan database

router1(config)#vlan database

2. create layer 2 vlans

router1(config)#vlan 2 name network_mgmt

router1(config)#vlan 3 name data

router1(config)#vlan 4 name voice

3. Assign L2 vlans to a port on the switch.

router1(config)#

int Fast2

switchport access vlan 2

int Fast3

switchport access vlan 3

int Fast4

switchport access vlan 4

4. create layer 3 vlan interfaces for routing.

int vlan 2

ip address 192.168.2.254 255.255.255.0

no shut

int vlan 3

ip address 192.168.3.254 255.255.255.0

no shut

int vlan 4

ip address 192.168.4.254 255.255.255.0

no shut

Hope this helps :)