Switch IP Config

certskills
By certskills December 28, 2011 07:00

This next lab begins with a switch that has been configured to allow Telnet + SSH, including password protection – except the fact that neither switch yet has an IP address. This lab asks you to add the IP configuration to the switches. Details below the fold. Check this link for all the Config labs in this blog. Enjoy!

The Network, Initial State, and Rules

This VM piece uses the simple LAN shown in Figure 1. It shows two switches, connected by a link, with a router on the side.

Figure 1 – Lab Topology

This lab begins with the router configured correctly, but the lab ignores the router configuration for the most part. The two switches have all default configuration, except for the configuration shown here as Examples 1 and 2.

Example 1: SW1 Config

Example 2: SW2 Config

And the general rules:

  • The router has been configured already, and is working.
  • The router is connected to other links, not shown; those links are completely unimportant to the lab.
  • The two LAN switches have no configuration; just before this lab, their config was erased, and the switches were reloaded.
  • This lab uses only ICND1/CCENT concepts, so the link between the two switches is not a VLAN trunk, and only the default VLAN (VLAN 1) is in use.

Now that you have the background, the rest of this post spells out your tasks.

Problem: Choose IP Addresses and Configure Both Switches

As usual, and on purpose, the tasks are straightforward. In this case, the requirements list a subnet, and some comments. You do some subnetting math to decide the IP address for the router interface, the two switches, and the mask to configure. Then configure the IP details, so that the switches can communicate off-subnet and with hosts on the local subnet. That’s it! Details in the list:

  1. Use subnet 192.168.1.0/27.
  2. Use the numerically highest IP addresses: the highest for the router’s F0/0 interface into the LAN, the next highest for SW1, and the next highest for SW2.
  3. Configure SW1 and SW2 to allow hosts to the right of router R1 (not shown) to be able to Telnet to SW1, or Telnet/SSH to SW2.
  4. As a reminder, note that neither switch uses VLAN trunking, and all ports are in the default VLAN (1).
Answer: Switch Admin Config
Answers: Switch IP Config
certskills
By certskills December 28, 2011 07:00
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1 Comment

  1. Mit June 11, 01:21

    Mr. Wendell,

    This is not quite related to this particular post. But I would be happy if you can throw some light on my query that I have after reading your book.

    Basically, want to distinguish two things.

    What is the difference when I give an ‘ip default-gateway’ command to a Router and when I define a static default route (ip route 0.0.0.0 ….)?

    Could you please clear this for me? I believe this two won’t mean the same thing. Please correct me if I am wrong. Thanks.

    Mit

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