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Community Member

1721 Router Question

Hi, I'm new to Cisco h/w and have been self training on reconfiguring a 1721 router with a 1DSU T1 WIC. The router was originally for our internet connection. The left slot has the above WIC the right slot is empty. What I want to do is simply use the router to connect to a seperate network within our facility. My question is, do I need to use a different WIC card and if so, what should I use? THanks.

2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Gold

Re: 1721 Router Question

Hi, you only need to connect a a switch that does vlans and configure vlan encap on the fastethernet interfface.

Alternatively you need WIC-1E.

Both solution will allow hosts on the two segments to communicate but NOT at wire-speed,

thing for which you should get a L3 switch, the smaller of these is WS3560-8PC.

Hope this helps, please rate post if it does!

Re: 1721 Router Question

Then the WIC-1ENET should work just fine! Tn IOS you will see a new ethernet interface which you would need to configure and connect to the other site.

8 REPLIES

Re: 1721 Router Question

What is the connectivity to the other location? Copper, fiber, T1?

Community Member

Re: 1721 Router Question

Sorry, it is copper. (Cat 5e).

Re: 1721 Router Question

OK, then Paolo's post is right on, either the WIC-1ENET or you could connect two switches together. The two switches option will give you better performance.

HTH

Hall of Fame Super Gold

Re: 1721 Router Question

Hi, you only need to connect a a switch that does vlans and configure vlan encap on the fastethernet interfface.

Alternatively you need WIC-1E.

Both solution will allow hosts on the two segments to communicate but NOT at wire-speed,

thing for which you should get a L3 switch, the smaller of these is WS3560-8PC.

Hope this helps, please rate post if it does!

Community Member

Re: 1721 Router Question

We don't have a spare L3 switch but do have the router. When you say " Not at wire speed" is that because the WIC card only supports 10mbps?

Re: 1721 Router Question

The switch does not have to be layer 3. You can do layer 2 but you would have to change some routing around which may not be worth it. How much inter-site traffic do you expect?

Community Member

Re: 1721 Router Question

There would be very little traffic through this router.

Re: 1721 Router Question

Then the WIC-1ENET should work just fine! Tn IOS you will see a new ethernet interface which you would need to configure and connect to the other site.

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