Archives for March 2014

Mar 29, 2014 By Jared Heinrichs Leave a Comment

Multi-Area OSPF network Lab

Here’s a Packet Tracer 6 lab I created that tests a bunch of things outside just OSPF. Keep in mind that all the 1941 routers use the HWIC-4ESW to provide four switching ports. It’s important to remember that this is really just a switch attached to the router. You will have to find a way of routing traffic off the switch to the rest of the network.

You will need to be able to ping the router’s “router-id” from anywhere on the network.

I’ve included a picture what the 1941 routers physically look like:

Just for good measure here is the backbone router. I needed to add a NM-2FE2W Module. It provided me with two Fast-Ethernet interfaces which allowed me to have up to 4 connections on each backbone router.

Here’s the OSPF-Multi-area lab with Before and After Example. I’ve also included all the commands I put into the routers.

Mar 25, 2014 By Jared Heinrichs Leave a Comment

Cisco – IP routing not enabled error on Layer 3 switch

The first time I worked on a layer 3 switch I went to go an configure OSPF on the layer 3 switch or also called a “swouter”.

When I ran “router ospf 1” then command line spit back this error: “IP routing not enabled”. You can see the screenshot below of the error:

It turns out that Layer 3 switches need to have routing enabled because it is disabled by default! But what is the command to enable routing on the layer 3 switch?

The command is:

ip routing

Yes. That’s all it takes to enable routing on the layer 3 switch! Once you have done that you should be able to finish setting up OSPF or any other routing protocol you wish!

In packet tracer the layer 3 switch I used was a “3560-24PS”.

Here’s an example of a layer 3 switch being setup:

en
conf t
ip routing
host 4.4.4.4
!
int lo0
ip address 4.4.4.4 255.255.255.255
no shut
!
int vlan1
ip address 192.168.2.2 255.255.255.252
no shut
!
int vlan30
ip address 192.168.30.1 255.255.255.0
no shut
!
int vlan40
ip addres 192.168.40.1 255.255.255.0
no shut
!
int fa0/1
switchport access vlan 30
!
int fa0/2
switchport access vlan 40
!
int gig0/1
switchport access vlan 1
!
exit
!
router ospf 1
router-id 4.4.4.4
!
network 4.4.4.4 0.0.0.0 area 2
network 192.168.2.2 0.0.0.0 area 2
network 192.168.30.1 0.0.0.0 area 2
network 192.168.40.1 0.0.0.0 area 2\
end
wr
!

Mar 11, 2014 By Jared Heinrichs Leave a Comment

CCNA – How to combine routing protocols on a network

While most businesses will tend to pick one routing protocol and stick with it, sometimes through mergers or collaborations with other companies you might need to use multiple protocols on a network.

When I first started out I thought that if a router obtained a bunch of routes from OSPF. any RIP peers would “auto-magically” learn of those learned routes by comparing it’s routing table and it’s RIP/OSPF database.

This is not the case. In order for the router to share it’s learned routes with a neighbor that uses a different routing protocol, you will need to use the “redistribute” command to allow it to share those learned routes.

Let’s look at an example BEFORE we use the redistribute command: