A viable business no longer has an option not to have a website. So the only question is: Are you going to have a world-class website, or one that’s thrown together and doomed to fail? If “world-class” is your answer...
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Unicast Reverse Path Forwarding (uRPF)
What is unicast reverse path forwarding: 1. Used to prevent malicious traffic on a network 2. This functionality works by verifying the source IP address in the packets that are being forwarded by the router 3. If the source IP...
BGP Route Filtering Using Regular Expressions
Regular expressions can be used to match patterns in a input string, Regular expressions in BGP is used to filter Autonomous System number from the AS_PATH attribute. Regular Expression Function . Any single...
Route Filtering using Distribute List – Example
A distribute list can be configured inbound or outbound . Distribute list uses a standard or extended access control list (ACL). Distribute list are the simplest form of route filtering. The following is BGP ...
Using prefix-list example scenarios
Prefix lists are used to filter routes based on prefix and subnet masks. The following are some prefix-list examples. Prefix list can be applied directly on a neighbor statement for BGP or using a route-map ! Match only...
DMVPN – Dynamic Multipoint Virtual Private Network
How to configure DMVPN – Config example. Dynamic Multiple Virtual Private Network (DMVPN) is a dynamic virtual private network that provides the capability of creating a dynamic-mesh VPN network without manually...
Mobile Payment options to help small business owners
There are several factors that determine the success of any small business. To keep the services up and running they rely on getting paid by the customers on time. There are wide varieties of payment systems that enable a...
Route Maps
It is a serious of match and set statements similar if-then statements in a programming language. Facts about route maps Used to set special BGP attributes to certain routes (local preference, weight, metric etc) Used for Policy...
Facts or key information about MPLS:
In a MPLS network, the forwarding decision is made based on labels.MPLS labels are inserted between layer 2 and layer 3 The “P” router is the router inside the service provider network in the MPLS path LDP router ID is the...
OSPF Cheat Sheet
OSPF stands for Open Shortest Path First and it is a Interior Gateway Routing Protocol (IGP). RFC 2328 defines the standard for OSPF Version 2. The following are few facts about OSPF – Interior Gateway Routing Protocol...
Gateway load balancing protocol (GLBP)
This is cisco proprietary and communicates via UPD multicast 224.0.0.102 at port 3222. It provides load balancing between routers in a group. It uses one virtual IP address but multiple MAC address. The active virtual agteway...
Virtual Router Redundancy Protocol (VRRP)
This is a open standard protocol and documented in RFC 3768. It communicates using its own multicast transport via IP protocol 112 to 224.0.0.18. It used master and backup routers. The master router forwards the virtual mac...