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Config snippets : Cisco : First time 881w ISR with AP configurarion

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When I got cisco 881w first time it was interesting experience. This device presented new concept which was different to model I knew so far, which is 871w. In 881w router module and wireless module are separated. With that being said, router configuration and access point configuration is separated as well. Also, each module (router and access point) has own IOS:

  • c880data-universalk9-mz.152-1.T1 – router IOS
  • ap801-k9w7-mx.124-21a.JA1 – access point IOS

As usual, first I connected device to console cable and attempted to configure it. Not being familiar with new concept it was a bit of a failure 🙂 So, eventually had to refer to documentation to find out what’s going on. Problem which came up was, how to access wireless module to configure it or even check if it’s there 🙂

So, finally after I did apply reading ability and spent few minutes with Cisco documentation I was able to access wireless module and configure it to provide wireless services in the air. Here is how that happend:

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Config snippets : Cisco : Testing RADIUS authentication on IOS

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Recently was migrating RADIUS server on Windows from one machien to another. Once new serer was ready had to reconfigure Cisco router to authenticate remote users against new RADIUS. After pointing Cisco to new RADIUS machine made a quick test to check if router can authenticate without any issues. Here is how ot do it quickly:

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Config snippets : Configuring static IP address on Debian 6.0

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Just quick config snippet for Debian 6.0 which I came across when setting up few Debian Linux 6.0 virtual machines for recent network LAB. By default network adapter is set to get IP address from DHCP.

/etc/network/interfaces – dynamic IP address configuration

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface auto lo iface lo inet loopback
# The primary network interface allow-hotplug
eth0 iface eth0 inet dhcp

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8

How-to : Using WebSVN as RANCID repository access tool

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In previous articles in the RANCID series I described:

So, we have RANCID collecting configuration from network devices to repository with version control. Only question is how to get access and make use of information collected there.

In this part of RANCID stories I will show how to install and configure WebSVN to access RANCID repository via web browser.

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How-to : Adding devices to RANCID

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Some time ago I described How to : Install RANCID on openSUSE 11.4 “Celadon”. However, just after installation RANCID will do nothing without proper configuration.

So, in this lab I will show how to:

  • create group of devices in rancid
  • add information about credentals to RANCID
  • add 2 Cisco routers to that group
  • collect configuration from routers
  • setup cron task to run rancid automatically

Systems which will be used to demonstrate how to add device to RANCID and collect configuration:

  • lab-gw-01 – IP: 172.16.90.5 – openSUSE witn RANCID – installed on VMware Workstation
  • lab-r1 – IP: 172.16.90.123 – Cisco router – started on GNS3
  • lab-r2 – IP: 172.16.90.124 – Cisco router – started on GNS3

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Config snippets : Cisco : Resetting interface statistics on Catalyst

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Recently I went through troubleshooting of Site-to-Site Layer-2 link. One of the things we did during troubleshooting of that link was checking interface statistics for interfaces which were connecting two geographical sites together.

Below quick overview how ot check and reset port statistics if required during troubleshooting process.

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