Currently viewing the category: "Routing and Switching"

Cisco: Speed vs Bandwidth interface command

By On August 3, 2010 · 2 Comments

It’s not uncommon to see people making mistake about the two interface commands speed and bandwidth. Most of the young engineers ( and not only ) assume that bandwidth and speed have the same meaning when applied under the interface and that purpose is to reduce the throughput of the interface up to the limit [...]

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Cisco: IP Policy Routing with IP SLA and EEM

By On May 31, 2010 · 6 Comments

Considering the same environment like in the post Cisco: Policy Routing with IP SLA, there is another way to achieve the same behavior using again IP SLA and EEM (Embedded Event Manager).

For those of you who are not so familiar with EEM please read http://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html. You will [...]

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Cisco: Policy Routing with IP SLA

By On May 27, 2010 · Leave a Comment

Let’s assume that you have a Cisco router with 2 ISP connection. The first one it’s a 10Mbps connection with a decent latency and the second one it’s a 2Mbps connection with quite high latency.

Since you don’t want to load balance over this 2 connections for the obvious reasons described above, you decide to to use [...]

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How to use a Cisco router as Frame-Relay switch

By On May 14, 2010 · 2 Comments

For this tutorial you can use  a low cost Cisco router and of course you need some serial interfaces available on this router. I will use a 7206 with 3 serial interfaces. This router I will call R6 and the rest of the three routers connected to R6, will be R2, R5 [...]

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INE released GNS3 config for v5 topology

By On April 28, 2010 · 2 Comments

A few days ago one friend on mine announced me that InternetworkExpert released a GNS3 configuration for their v5 topology.

When I had check INE’s website, I could not found the link to GNS3 topology. To be honest I was expecting INE to announce with big letters this new development, but [...]

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Free Netflow Analyzer software

By On March 25, 2010 · 3 Comments

For today, I put together a list with the software that I’m using when I’m testing network behavior in the lab. The software below is free, with some restrictions but is perfect to use it when you need a quick solution to monitor your network with Netflow, sFlow or jFlow.

All the proposed software have [...]

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Cisco Borderless Network – Phase 2

By On March 16, 2010 · 1 Comment

Everywhere where I turn my look in the last days I hear about the quick coming of Phase 2 of Cisco Borderless Network. If you are interested, you can register for the event on Cisco website .

I tried to search some documentation to understand what is Cisco [...]

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OSPF: Area range vs Summary address

By On March 6, 2010 · 7 Comments

It seems like an easy one! I mean what could be so hard about area range and summary address command? You will be surprised how many people tend to forget this things or to apply them when not necessary or even worst where is their place to be added. It’s basic knowledge, but sometimes exactly [...]

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Cisco: How to configure HSRP

By On September 25, 2009 · 3 Comments

In this post I proposed to discuss a little bit about Hot Standby Router Protocol and how it can be configured on a Cisco device. For this I have chosen the following topology:

I had in mind this scenario due to the fact that the traffic can take [...]

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Cisco: 2-Bytes / 4-Bytes ASN BGP scenarios

By On September 18, 2009 · 10 Comments

In my last post I wrote some basics about the new 4-bytes AS number which is supported on new Cisco IOS images. Now I would like to give you a brief overview about different BGP peering scenarios that you can meet in the real world. Even if the configuration examples [...]

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