Archive : Routing and Switching

Port-channel (or etherchannel) is a great way to increase the transport capacity between 2 switches or between a switch and an end device that suport load balancing (e.g. server). Today I don’t want to focus on how the Port-channel are configured, but more on how they load-balance the traffic over...

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...

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....

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...

//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 and R9. In this way it will be...

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 I was...

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...

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 Borderless Network and which is the big difference...