Cisco 1921 ISR with HWIC-1GE-SFP connect to LAN

eddysamson · ‎10-31-2011

Hi all-

I am new to Cisco products (a newbie) and I could use a little help. We are a very small company with 2 netgear switches connected via fiber, we bought the Cisco 1921 ISR with the HWIC-1GE-SFP to get a router that would be able to connect via fiber to our switches. I called Cisco and their reps recommended this router/HWIC pair to me.

I have got the basic configuration out of the way and I have discovered my router with CCP, now I would like to know how I can configure this HWIC. I have the SFP(GLC-SX-MM= ) installed correctly and it is connected to our test switch via an LC/LC cable, but when I do 'show ip interface" all ports are down except the one my workstation connects directly to the router with (gigabit0/1).

I am pretty sure the HWIC is GigabitEthernet0/1/0 am I wrong? How can I configure this?

Thanks!

Reza Sharifi · ‎10-31-2011

Hi Sam,

The 1921 comes with 2 on board 10/100/1000 interface. To connect one if these interface to a fiber device (Netgear) you could buy a media converter that comes with LC to RJ45. In that case you would not need the fiber module at all.

Anyway, you have the correct module. The HWIC-1GE-SFP is a 1Gig SPF interface. Try switching the fiber strands around. I know it is not easy with LC type connectors, but you still can switch them around to make sure no TX is connected to RX.

Edit: is the Netgear also LC or SC?

if SC switch that side

HTH

darren.g · ‎10-31-2011

sam edson wrote:

Hi all-

I am new to Cisco products (a newbie) and I could use a little help. We are a very small company with 2 netgear switches connected via fiber, we bought the Cisco 1921 ISR with the HWIC-1GE-SFP to get a router that would be able to connect via fiber to our switches. I called Cisco and their reps recommended this router/HWIC pair to me.

I have got the basic configuration out of the way and I have discovered my router with CCP, now I would like to know how I can configure this HWIC. I have the SFP(GLC-SX-MM= ) installed correctly and it is connected to our test switch via an LC/LC cable, but when I do 'show ip interface" all ports are down except the one my workstation connects directly to the router with (gigabit0/1).

I am pretty sure the HWIC is GigabitEthernet0/1/0 am I wrong? How can I configure this?

Thanks!

Sam.

What version of IOS are you running on the 1921? Software support for the HWIC-1GE-SFP wasn't included on the 1921 until IOS 15.0(1) at minimum according to this

http://www.cisco.com/en/US/prod/collateral/routers/ps5854/product_data_sheet0900aecd8016be8d_ps5949_Products_Data_Sheet.html

web page. I've had s similar issue with other HWIC cards - installed them, fired up the router and went "huh?" when the interfaces didn't show - then checked the IOS version and went "Doh!".

Also, you should note that the HWIC-1GE-SFP is a layer 3 port by default - you'll need to configure it with subinterfaces if you want it to trunk into switches that don't support layer 3 routing - I.E. you need to do something like this

interface g0/1/0.5

encapsulation dot1q 5

Not sure how you do this if you want to trunk multiple VLAN's - just add additional sub-interfaces, at a guess.

Cheers.

eddysamson · ‎11-03-2011

I took off the IP on my GE0/1/0 interface and did:

int gigabitethernet0/1/0.1

encapsulation dot1q 1

ip address 192.168.2.1 255.255.255.0

and the fiber connection still isn't quite working correctly. When the switch is only connected through the HWIC, I get 'Unidentified Network' on my workstation and I can no longer access the router with telnet.

I am still missing something although I feel like I am really close.

darren.g · ‎11-03-2011

sam edson wrote:

I took off the IP on my GE0/1/0 interface and did:

int gigabitethernet0/1/0.1

encapsulation dot1q 1

ip address 192.168.2.1 255.255.255.0

and the fiber connection still isn't quite working correctly. When the switch is only connected through the HWIC, I get 'Unidentified Network' on my workstation and I can no longer access the router with telnet.

I am still missing something although I feel like I am really close.

Are you certain the fibre link is coming up?

What happens if you connect it and do

router# show int g0/1/0

You should get something like this (this is from a ten gig interface, so ignore the speed etc)

TenGigabitEthernet1/1/1 is up, line protocol is up (connected)

Hardware is Ten Gigabit Ethernet, address is f866.f27c.c91d (bia f866.f27c.c91d)

MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not set

Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR

Does your interface show up, line protocol is up (connected) like this one?

Also, if you have the switch conencted by copper *and* fibre at the same time, you'll get spanning tree loops if the Switch isn't spanning tree aware.

Another possibility is that the switch doesn't support dot1q trunking. If this is the case, you could be in trouble getting the two devices to talk, because the only way to get a VLAN out of a HWIC is via a trunk, and if the device you're connecting it to doesn't understand trunking...

Cheers.

eddysamson · ‎11-04-2011

Oh sorry I forgot to update the discussion. I figured it out. Did not need a subinterface, but my switch needed a factory reset to pick up the fiber connection (not sure why).