ISR 4331 SFP Module Over Trunk Line to Cisco 24 Port Switch

[Totally Kyle]

Hello all,

I am trying to configure a ISR 4331 Router with a fiber SFP module to replace an ethernet that was plugged into the switch port 1/0/14.  Which will now to go from the router's SFP port 0/0/2 to a switch to a computer system that is plugged into the switch.  There is a trunk line going from the router port 0/0/1 to the switch port 1/0/24.  

The system network is 172.16.0.XXX.  

How do I get it so the computer system can pick up the data from the router fiber SFP port, just like it was when the data was coming into the switch via ethernet on port 1/0/14?

[balaji.bandi]

how does your configuration looks like on Router and Also switch port.

if that is trunk and dot1q with VLAN and IP address , then you need to copy example same configuration to the new ports.

[Totally Kyle]

I kind of thought that, and have been trying to do that (I think?).  This is my first time really doing networking so I am kind of lost.

Here's the configs for the parts we are using I think, thanks for all your help! 

The Router Configs:

GigabitEthernet0/0/1 is up, line protocol is up    <==== TRUNK
Hardware is ISR4331-3x1GE, address is 08f3.fb3c.9231 (bia 08f3.fb3c.9231)
Description: //LAN INTERNAL NET\\
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is force-up, media type is RJ45
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00

GigabitEthernet0/0/2 is up, line protocol is up  <==== SFP PORT
Hardware is ISR4331-3x1GE, address is 08f3.fb3c.9232 (bia 08f3.fb3c.9232)
Description: //WAN EXTERNAL NET\\
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is LX
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00

The Switch Configs:

Vlan1 is administratively down, line protocol is down , Autostate Enabled
Hardware is Ethernet SVI, address is 8027.6c7e.5047 (bia 8027.6c7e.5047)
MTU 1500 bytes, BW 1000000 Kbitsec, DLY 10 usec,
reliability 255255, txload 1255, rxload 1255
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type ARPA, ARP Timeout 040000

GigabitEthernet1024 is up, line protocol is up (connected)   <==== TRUNK
Hardware is Gigabit Ethernet, address is 8027.6c7e.5018 (bia 8027.6c7e.5018)
Description TRUNK TO ROUTER
MTU 1500 bytes, BW 1000000 Kbitsec, DLY 10 usec,
reliability 255255, txload 1255, rxload 1255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mbs, media type is 101001000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type ARPA, ARP Timeout 040000

GigabitEthernet1/0/14 is up, line protocol is up (connected)    <=== ETHERNET BEING REPLACED BY SFP
Hardware is Gigabit Ethernet, address is 8027.6c7e.500e (bia 8027.6c7e.500e)
Description TRENDNET SWITCH
MTU 1500 bytes, BW 100000 Kbitsec, DLY 100 usec,
reliability 255255, txload 1255, rxload 1255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mbs, media type is 101001000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type ARPA, ARP Timeout 040000

[balaji.bandi]

that output is show interface x/x - that should all up and working - what is the issue here ?

you need to post below config :

show run int GigabitEthernet1/0/14

show run int GigabitEthernet1/0/24

show run int GigabitEthernet0/0/0

show run int GigabitEthernet0/0/1

show cdp neigh

[Totally Kyle]

The Switch GigE1/0/14 still has the ethernet plugged in that I am trying to replace with the Router SFP module (0/0/2). 

So I want to eliminate that Switch GigE 1/0/14, to be replaced Router SFP 0/0/2 over the trunk line.  

Sorry about that, should have set the configuration before capturing the configs

[M02@rt37]

Hello @Totally Kyle 

Assuming PC's Gateway are configured on that ISR4331, you should configure Router On A Stick on that ISR4331 side, under SFP interface id.

Switch side, interfaces plugged on that SFP port is a traditional Trunk.

Ensure that PCs are connected to the Switch, and Switch ports are configured in access mode.

https://www.grandmetric.com/knowledge-base/design_and_configure/router-on-a-stick-approach-cisco-configuration/

[Georg Pauwen]

Hello,

--> Which will now to go from the router's SFP port 0/0/2 to a switch to a computer system that is plugged into the switch. There is a trunk line going from the router port 0/0/1 to the switch port 1/0/24. 

So you basically have two ports going from the router to the switch ? This is not very clear, post a schematic drawing of your topology showing how you devices are physically connected. Also, post the full output of 'sh run' of both the router and the switch.

[Totally Kyle]

@Georg Pauwen @balaji.bandi M02@rt37 

Alright this is all the configs from the commands and physical crude network diagram.  After researching more I guess a more accurate description of what I am trying to do is get the new Fiber SFP on Router0/0/2 onto the same (virtual?) network that the Switch1/0/14 was on so the computer can access the data.

I really appreciate all the help, you all could help save thousands of dollars for other hardware