Trying to connect 2960-x SFP to 2921 router EHWIC SFP

[dlaiakis1]

Hi all,

Could anybody help me with this? I have connected the modules (2960 Switch g0/49 & 2921 Router EHWIC g0/1/0) with fiber cable and I have physical link but I don't know how should I proceed with configuration. Is there a way (L2) without applying ip addresses?

I suppose I have to configure the following:

2960-x

----------

int vlan1

ip default gateway

int g0/49 (SFP PORT)

2921

----------

EHWIC SFP PORT int g0/1/0

Thank you all,

Dimitris

[Philip D'Ath]

There is not enough information to answer this question.  What do you actually want this configuration to do? 

A simple configuration would involve doing nothing on the 2960, and configuring an IP address on the 2921.

[dlaiakis1]

Thank you Phillip for your answer. As you have mentioned I want the simplest configuration for the 2960 to be operational. If I do nothing then when host is connected to switch not working. 2921 is already operational and has Ip configuration. Do I have to configure an IP address on the EHWIC also?

[Philip D'Ath]

Yes, you need to configure an IP address on the EHWIC port.

[dlaiakis1]

I have already configured the built in g0/0 of the 2921. Do I need a different subnet on the EHWIC? Because I get an overlapped IP address message if I do so. Here is my configuration:

2921 g0/0 (management):

interface GigabitEthernet0/0
 ip address 10.10.31.254 255.255.255.0
 duplex auto
 speed auto

EHWIC g0/1/0 (SFP to switch):

interface GigabitEthernet0/1/0
 no ip address
 media-type sfp

Thank you

[Philip D'Ath]

You sure do.  They are separate layer 3 interfaces.

What does Gig0/0 plug into?  Perhaps you could plug those two devices together?

Perhaps you could use:

interface GigabitEthernet0/1/0
 ip address 10.10.30.254 255.255.255.0

[dlaiakis1]

Yes this works! If I put this as my EHWIC address and on the switch side for ex. 10.10.30.253 we have connectivity. But the switch cannot reach the outside world as the router does.

[Philip D'Ath]

Does the Internet connect to this router?  Whatever is doing NAT you will need to extend to include this new subnet.