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

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

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 in this article are on a Cisco hardware with the latest IOS, the BGP scenarios can be applied to [...] Continue Reading…

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Cisco: The basics about VRF implementation

Cisco: The basics about VRF implementation

VRF, meaning Virtual Routing and Forwarding, is a technology implemented in the IP network routers that allows multiple instances of a routing table to exist on the same router in the same time. Since each VRF is independent, the same IP subnet can exist in 2 different VRFs. Basically you can overlap one IP address in 2 VRFs but without conflicting with each other. Even this is possible, I [...] Continue Reading…

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Wireshark's most useful display filters

Wireshark’s most useful display filters

Now and then, especially when you expect less, the network crashes or encounter an issue and then you had to troubleshoot. Sometime the problem is right there, you can see it and it’s easy to fix, but in other cases you’ll have to put an eye in the packets that are traveling through it and search deeper for the solution. When it comes to network sniffing or packet capturing [...] Continue Reading…

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How to integrate GNS3 with Virtual PC

How to integrate GNS3 with Virtual PC

In this article I want to show you how to extend your posibilities to test a network in GNS3. Sure, it’s simple sometime to use a Loobpack interface on one of your edge routers to simulate an external network, but sometime is useful to have something connected to the router port. Take as an example QoS marking and classification. If you want to mark something inbound, then you need [...] Continue Reading…

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Cisco: How to configure simple IP SLA monitor

Cisco: How to configure simple IP SLA monitor

Before we begin let’s see what is this SLA term, for those of us who are not very familiar with the Service Provider terms. IP Service Level Agreements (SLAs) enable customers to assure new business-critical IP applications, as well as IP services that utilize data, voice, and video, in an IP network. With Cisco IOS IP SLAs, users can verify service guarantees, increase network reliability by validating network performance, [...] Continue Reading…

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The Cisco CRS-3 Carrier Routing System

The Cisco CRS-3 Carrier Routing System

On March 9, 2010 Cisco announced the Cisco® CRS-3 Carrier Routing System (CRS) designed to serve as the foundation of the next-generation Internet and set the pace for the astonishing growth of video transmission, mobile devices and new online services through this decade and beyond.

With more than 12 times the traffic capacity of the nearest competing system, the Cisco CRS-3 is designed to transform the broadband communication and entertainment [...] Continue Reading…

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GNS3: OSPF and EIGRP scenario

A ready made GNS3 topology, including 3 interconnected routers in different domains (EIGRP and OSPF) like in the topology below.

Requirements:
- GNS3 or Dynamips install and functional
- Cisco IOS image for 3640 platform with Advanced IP Services
What’s included in the archive:
- routers initial configs
- network diagram
- GNS3 (or Dynamips) config file*
* Check the GNS3 config file for direction
What can you test with this scenario:
- ospf area range command
- ospf summary [...] Continue Reading…

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Cisco and IDG international Innovation Awards 2010

Austrian Companies ASFINAG & X-Tention Win the Cisco and IDG international Innovation Awards 2010
ASFINAG scoops award for implementing reliable communication network in Austria’s tunnels and X-Tention takes prize for its use of innovative IT solutions to link doctor’s surgeries, care homes and hospitals.

Quoting Cisco Press release:

“ASFINAG rewarded for highly secure and reliable communication in Austria’s tunnels

ASFINAG Autobahnen- und Schnellstraßen-Finanzierungs-Aktiengesellschaft won the Cisco Innovation Award 2010 in the Most Innovative [...] Continue Reading…

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Cisco quits WiMax radio business

WiMAX, meaning Worldwide Interoperability for Microwave Access, is a telecommunications technology that provides wireless transmission of data using a variety of transmission modes, from point-to-multipoint links to portable and fully mobile internet access. The technology provides up to 10 Mbps broadband speed without the need for cables. The technology is based on the IEEE 802.16 standard (also called Broadband Wireless Access).

The bandwidth and range of WiMAX make it suitable [...] Continue Reading…

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