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1941 router WIC-2T

darrenvlowe
Level 1
Level 1

Hi,

I'm new here & currently studying for CCNA.

I purchased 3 x 1941 routers & had to get 3 x WIC-2T modules, one for each router.

Upon turning on the routers & running some basic commands, I noticed there are no power lights on for the serial modules on any of the routers.

I have DTC/DTE cables connecting them together to a single 2960 switches as shown below. When I check with a show run command there are no serial interfaces available?

Am I missing something, is there a command I have to run to start the modules or change something externally?

Any help would be appreciated?

Thanks

cisco.png

 

1 Accepted Solution

Accepted Solutions

Hi Rick.

Yes, there is a 2960 switch just on top of the routers, out of view.

I did want to use the G0/0 & G0/1 interfaces to connect the routers together, as in the topology drawing, instead of buying new HWIC's. However, as you mentioned, it's not very convenient & I will be doing other lab set ups as well.

I guess I will have to purchase some HWIC-1T's instead!

I did set up some vlans on the switch to allow for the different networks & will follow your examples.

Thanks for your advice.

View solution in original post

9 Replies 9

Leo Laohoo
Hall of Fame
Hall of Fame

ISR G2, which the 1941 is classified under, does not support "plain" WIC-2T.  

HWIC-2T, however, is supported.

darrenvlowe
Level 1
Level 1

Thanks Leo.

Is that because the WIC-2T is lower bandwidth?

I am a bit puzzled. You tell us "I have DTC/DTE cables connecting them together to a single 2960 switches as shown below" But I do not see a single 2960 switch. It appears that you have router to router connections on the serial interfaces. I wonder if you are using standard Ethernet cables for these connections?

While the serial interface uses a connector like the RJ45 Ethernet the pinout for a serial cable is not the same as the pinout for Ethernet. 

 

HTH

Rick


@darrenvlowe wrote:

Is that because the WIC-2T is lower bandwidth?


$ales

Hello
Can you post the output of

Show diag
Show version


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

darrenvlowe
Level 1
Level 1

Hi Paul,

Below are some photos of the set up & the sh version & sh diag as requested.

Looks like its not supported or enabled?

If I can't use the WIC-2T serial modules, can I use the G0/0 & G0/1 interfaces?

Thanks

 

20210921_103957.jpg20210921_103926.jpgsh version.pngsh diag.png

Thanks for the additional information. The output of show diag is pretty clear that the card is not supported.

You ask about using G0/0 and G0/1. What/how would you plan to use them?

- a very simple implementation would be to use the interfaces to connect the routers back to back. G0/0 connects to one neighbor and G0/1 connects to the other neighbor. This would be simple but not very satisfactory. The routers would talk to each other. But there would not be anything else in your test environment.

- your drawing suggests that you have some switches. How many switches do you have and what kind of switches are they? (most especially do the switches allow you to configure vlans and assign switch ports to various vlans? and do they allow you to configure some switch interfaces as trunks?)

- assuming that the switches do support vlans and trunks I would suggest setting up something similar to this:

+ configure 6 vlans as follows

++ vlan 11 for devices connected to router1

++ vlan 22 for devices connected to router2

++ vlan 33 for devices connected to router3

++ vlan 12 for connecting router1 to router2

++ vlan 13 for connecting router1 to router3

++ vlan 23 for connecting router2 to router3

+ configure switch ports which will physically connect to routers as trunks carrying the appropriate vlans

+ connect those switch ports to appropriate interfaces on the routers

+ configure switch ports as access ports in vlans 11, 22, and 33

+ connect PCs etc to the access ports

+ router interfaces would be configured with subinterfaces for processing vlans

++ router1 would use vlan 11 for its connected devices, vlan12 for connecting to router2, and vlan 13 for connecting to router3

++ router2 would use vlan 22 for its connected devices, vlan12 for connecting to router1, and vlan 23 for connecting to router3

++ router3 would use vlan 33 for its connected devices, vlan23 for connecting to router2, and vlan 13 for connecting to router1

++ each router would configure 3 subnets. one subnet would be used for its locally connected devices and two subnets for connecting to its router neighbors.

HTH

Rick

Hi Rick.

Yes, there is a 2960 switch just on top of the routers, out of view.

I did want to use the G0/0 & G0/1 interfaces to connect the routers together, as in the topology drawing, instead of buying new HWIC's. However, as you mentioned, it's not very convenient & I will be doing other lab set ups as well.

I guess I will have to purchase some HWIC-1T's instead!

I did set up some vlans on the switch to allow for the different networks & will follow your examples.

Thanks for your advice.

I am glad that my suggestions were helpful. As I suggested I believe that you could build successful lab topologies using only the router Ethernet interfaces and switches. It could provide for router to router links as well as lan subnets for each router. But there are some advantages to obtaining and using HWICs for your network. It moves the router to router communication off of the Ethernet interfaces. And with working serial interfaces it allows you to observe some differences in behavior when you have (actual) point to point interfaces. I am thinking, for example, of the differences of a static route which points to an outbound interface (without a next hop being specified), which can be problematic on Ethernet but is quite fine on serial interfaces, or the differences in OSPF when the neighbor is on point to point rather than multipoint/broadcast.

HTH

Rick