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BGP Design Test
I will share a network design test bi-weekly for you. These tests will help you for the CCDE Written Exam. You will answer the questions and see the results immediately. If you liked the idea,let me know in the comment box below. Don’t forget to check my CCDE Training which will start at first week of April.… Read More »
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orhanergun.net February 2015 Site Statistics
As a blog which mostly share network design articles and only launched less than 2 months before, traffic to orhanergun.net surprised me. Let’s see the page views,top articles, top countries and top commenters. I am planning to advertise statistics every month, so you can see how the site which you follow/like performs. Statistics show only February… Read More »
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Seamless MPLS Architecture
Seamless MPLS architecture can be used to create very large scale MPLS network, reduces operational touch points for service creation, reduces overall complexity and enable flexible service creation points in the Service Provider networks. Seamless mpls architecture best suited for the very large scale service provider networks which has 10s or 100s of thousands access nodes, very… Read More »
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OSPF Design Challenge
OSPF and MPLS is most commonly used two technologies in an MPLS VPN environment. In this post I will share a mini design scenario with you and ask couple questions about the fictitious company architecture. When you attend to my CCDE class,we will work on tens of scenarios similar to this. I published last week my… Read More »
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OSPF as a PE-CE Routing Protocol
OSPF as a PE-CE routing protocol can be used in the MPLS Layer 3 VPN design between customer and the service provider. If the customer receives an MPLS Layer 3 VPN service , routing protocol is enabled between the customers and the Service Providers. Don’t forget that static routing is a routing protocol ! This VPN… Read More »
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Carrier Supporting Carrier – CSC
CSC Carrier Supporting Carrier is a hierarchical MPLS VPN architecture between the Service Providers. Service is an MPLS VPN service mostly but doesn’t have to be as you will see throughout the post. Customer carrier ( Provider ) receives an MPLS VPN service from the Core/Backbone carrier. Although CSC architecture is not common in real… Read More »
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ASK your questions and SHARE your opinion
I receive lots of questions from my students, readers, customers, followers on network design. I try to answer as quickly as possible and in detail. Thanks to all of them ! I receive a lot of kind emails, messages from them to put my effort on this blog as well. But for many reasons, I… Read More »
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MPLS VPN and DMVPN Design Challenge
MPLS VPN is used mostly as primary connectivity and DMVPN as a backup in the small medium business. You might see in some cases DMVPN is the only the circuit between remote offices and the datacenter/HQ, or for some applications MPLS VPN might be the primary,DMVPN for the others. As an example high throughput, high… Read More »
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SEGMENT ROUTING
Segment routing is a source routing mechanism which provides Traffic Engineering , Fast Reroute, MPLS VPNs without LDP or RSVP-TE. Very simple but powerful solution,when you read the post you will ask more information, because it solves the complex problems with some extensions to existing protocols. MPLS provides BGP free core, VPN services (Layer2 and… Read More »
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DMVPN Dynamic Multipoint VPN
DMVPN is dynamic, scalable and easy to configure Cisco specific VPN solution. DMVPN uses two major technologies for its operation : NHRP Next Hop Resolution Protocol mGRE Multipoint GRE In this post I will explain all the basics of DMVPN. For detailed routing protocol design over DMVPN will be covered in different post which will… Read More »
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BGP Route Reflector Clusters
BGP Route reflectors are used as an alternate method to full mesh IBGP and helps for scaling. BGP Route reflector clustering is used to provide redundancy in an RR design. Route Reflectors and its clients create a cluster. In an IBGP topologies, every BGP speaker has to be in a logically full mesh. Route reflectors… Read More »
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