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Configuration of Cisco 2841 router

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  • Configuration of Cisco 2841 router

    Hello folks -

    I have 2 sites (main site and branch site)that need to be connected via Cisco 2821 routers. I'll call them Router A and Router B. Each one of these routers has 2 network interfaces; GE 0/0 and GE 1/0.

    Our ISP has provided a site-2-site link between the two sites.

    Main site A has a network address of 10.0.0.0. Branch site B has a network address of 10.2.2.0. Each one of these sites use a /24 SM.

    I have configured router A (at main site) as follows:

    1. GE 0/0 - 10.0.0.207
    2. GE 1/0 - 172.16.80.1 (/30 mask)
    3. Default Gateway - 10.0.0.1 (PIX at main site)
    4. Encapsulation - ARPA (was there by default)
    5. Static route for traffic from router A to router B

    I have configured router B (at branch site) as follows:

    1. GE 0/0 - 10.2.2.1
    2. GE 1/0 - 172.16.80.2 (/30 mask)
    3. Default route that would send all traffic to 172.16.80.1
    4. Encapsulation - ARPA (was there by default)

    Our ISP has provided a switch at the main site that apparently is part of a VLAN. That switch connects us to the branch site, and also connects us to the Internet.

    Based on the information provided above, is there anything else I need to do in order to establish connectivity between the 2 sites? This is my first time configuring Cisco routers and want to be sure that I am doing this right.

    Also, should I leave the encapsulation at ARPA?

    Thanks for your help.

  • #2
    Re: Configuration of Cisco 2841 router

    Hi kunz12,
    Thanks for your post!

    ARPA is the default encapsulation is you don't want to change it.

    The IP addressing looks fine but I am wondering what your ISP's IP addressing looks like. I mean, if you are connecting Ethernet to them, then you are connecting to a box they installed and what is the IP addressing on that box and across the WAN link?

    Your IP addressing would be right if you were using a point to point serial T1 and your 172.x.x.x network was on you Serial interface card on each side of the T1. And, it may still be right if the ISP is giving you some kind of Ethernet layer 2 handoff, I'm just not sure about what they are doing.
    David Davis - Petri Forums Moderator & Video Training Author
    Train Signal - The Global Leader in IT Video Training
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