12-10-2008 07:51 PM - edited 03-04-2019 12:39 AM
After talking with a cisco agent. I purchase the cisco 851 without wireless. I need to configure one fast ethernet with ip.ip.ip.ip 255.255.255.240 and another fastethernet with ip.ip.ip.ip 255.255.255.248. Is it possible to turn 1 fast ethernet from the managed switch into another wan port.
12-10-2008 11:53 PM
Hello Stephane,
if your 851 has 4 ethernet ports they are already a small switch.
You can connect one port to another switch you may need to use a cross-over cable.
the ports are L2 and you need to associate them with Vlans
Some releases support only two vlans
vlan 1
name first
vlan 2
name second
int fas1
switchport
switchport mode access
switchport access vlan 1
int fas2
switchport
switchport mode access
switchport access vlan 1
int fas3
switchport
switchport mode access
switchport access vlan 1
int fas4
switchport
switchport mode access
switchport access vlan 2
desc to other switch
int Vlan1
ip.ip.ip.ip 255.255.255.240
! very important
no shut
int Vlan2
ip.ip.ip.ip 255.255.255.248
! very important
no shut
Hope to help
Giuseppe
12-10-2008 11:56 PM
you can use the fastethernet port as wan and use one of the ports of the switch for the managed lan by assigning an IP to the VLAN SVI
Narayan
12-11-2008 04:36 AM
These mean I can;t change the L2 switch unto a L3 WAN.
12-11-2008 06:19 AM
You can't apply the IP address directly under the fastethernet interface but you can associate the fastethernet to a virtual interface as Giuseppe illustrated and still perform the same functions.
HTH,
__
Edison.
12-11-2008 07:04 AM
Hi Edison,
If I set FasEthernet4 to
desc To cable modem
ip address ip.ip.ip.ip 255.255.255.240
no ip redirects
no ip unreachable
half-duplex
no shutdown
Then I set VLAN 1
desc to customer network
ip address ip.ip.ip.ip 255.255.255.248
and assign VLAN 1 to lets say fastethernet0.
I would be able to route information between both.
as if i would of setup the VLAN as a secondary WAN port.
Stephane
12-11-2008 07:08 AM
Correct.
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