Cisco 3725 Router with 16-Port EtherSwitch

Answered Question
Nov 23rd, 2008

Hi,

I have a Cisco 3725 router connected to our ISP (see diagram). It has a 16-port 10/100 Etherswitch (NM-16ESW). The f0/1 goes to a Cisco 3750 switch and our Internet connected servers are connected to the Cisco 3750 switch.

What I would like to do is to get rid of the Cisco 3750 switch and just use the 16-port Etherswitch on the Cisco 3725 router (see 2nd diagram). Is this possible?

When I connected a server to the 16-port Etherswitch and assigned a public IP to it - I can't ping it? What config do I need to do

Thanks.

Best,

Tony

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Correct Answer by Giuseppe Larosa about 8 years 6 days ago

Hello Tony,

to use the 16 ports you need to replicate the C3750 configuration on the router.

This can be done.

let's suppose you have only one VLan on C3750

the change you need to do is

create the vlan as a L2 object

config t

vlan 5

name servers

exit

assign the switched ports to vlan 5

int f1/1

switchport

switchport mode access

switchport access vlan 5

no shut

int f1/2

switchport

switchport mode access

switchport access vlan 5

no shut

...

repeat for all the necessary ports

shut the internal "router" interface

int f0/1

desc ex l3 link to c3750

shut

create the L3 vlan 5 interface

int Vlan5

! put here all the config was on f0/1

! just skip commands like speed, duplex

ip address 10.2.168.1 255.255.255.0

! very important:

no shut

This should make it working

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Mon, 11/24/2008 - 07:59

Hello Tony,

to use the 16 ports you need to replicate the C3750 configuration on the router.

This can be done.

let's suppose you have only one VLan on C3750

the change you need to do is

create the vlan as a L2 object

config t

vlan 5

name servers

exit

assign the switched ports to vlan 5

int f1/1

switchport

switchport mode access

switchport access vlan 5

no shut

int f1/2

switchport

switchport mode access

switchport access vlan 5

no shut

...

repeat for all the necessary ports

shut the internal "router" interface

int f0/1

desc ex l3 link to c3750

shut

create the L3 vlan 5 interface

int Vlan5

! put here all the config was on f0/1

! just skip commands like speed, duplex

ip address 10.2.168.1 255.255.255.0

! very important:

no shut

This should make it working

Hope to help

Giuseppe

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