orhanergun

Author Archives: orhanergun

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 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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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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