CCNP

OSPF Virtual Link Configuration Example

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ospf virtual link

OSPF virtual link is a very important configuration trick, in this article we will look how to configure OSPF virtual link with a little example. After we will see it deeply too. When we are configuring OSPF , we all know that all areas must be connected with Area 0. That means we can’t configure […]

CCNP

OSPF Over NBMA (Non-Broadcast Multi Access) Network

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nbma mode

In this article, we will review “OSPF Over NBMA Network“. First let’s take a look at to NBMA Topology types. There are 3 types of NBMA topologies. NBMA TOPOLOGIES * Hub and Spoke (Star topology ) * Partial Mash  (Partial redundant topology) * Full Mesh ( Full redundant topology) OSPF PROCESS OVER NBMA ( NON-BROADCAST […]

CCNP

BGP Best Path Calculation : How BGP Finds Best Path ?

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bgp default route

Border Gateway Protocol is one of the most important protocol providing connection on internet / different autonomous systems and BGP best calculation is the most important attribute of the protocol. Routing protocols find the “best path” to the target network using various algorithms.This article examines how BGP finds the best path for target network. Border Gateway Protocol finds […]

CCNP

What Is Dsniff And How To Get Rid Off Dsniff ?

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dsniff hacker

It is time to take a look at some security issues. One of the common attacking methods implemented by hackers is : Dsniff. So we need to answer “what is dsniff” , “how dsniff works” , “how we can get rid off dsniff” and etc. This is how dsniff works:  Hacker sends lots of MAC sources […]

CCNP

IPv6 Configuration, Implementing IPv6 Addresses

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ipv6 configuration

IPv6 is the technology of future, so IPv6 configuration is very important. Basicly, configuring IPv6 on an interface is almost same with IPv4 configuration. Simply under interface mode, you enter the ip address. Here is a configuration example for the IPv6 : R1(config)#interface Fa 0/0 R1(conf-if)#ipv6 add 2001:11AA::1/64 R1(config-if)#interface s 0/0 R1(conf-if)#ipv6 add 2001:22AA::1/64 R1#show ipv6 […]

CCNP

How To Configure BGP Tuning Attributes

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bgp tuning attributes

BGP Attributes help Border Gateway Protocol finding the best path. These attributes can be tuned, this makes BGP a flexible protocol. In this example “BGP Tuning Attributes Configuration” is examined deeply. R1#sh ip BGP sum Router-3 and Router-2 have different paths for 200.50.2.0/24 network, and they send it to Router-1. Neighbor 10.1.12.2 10.1.13.2 R1#sh ip BGP […]

CCNP

Redistribution Configuration: Step By Step Example

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advanced redistribution example

After configuring basic redistribution it is time to take a look at advanced redistribution with using more specific commands. We have an example to explain it deeply step by step… 1) Configure EIGRP and OSPF for the network above and advertise all the networks for every router. Don’t use summarization. Routes never should be advertised to both […]

CCNP

CEF (Cisco Express Forwarding) Explained

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wan

Cisco Express Forwarding (CEF) is an advanced layer 3 switching technology used mainly in large core networks to enchance the network performance. Let’s see how we can configure Cisco Express Forwarding (CEF) on cisco devices : SWITCH_A(conf)#ip cef (CEF is already active on default config) SWITCH_A#show ip cef vlan 200 In some cases we can’t […]

CCNP

BGP Neighbor Configuration Explained

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basic bgp config example

BGP neighbor configuration, is the first step about configuring BGP. Neighbors are manually configured at Border Gateway Protocol. It takes about 60 seconds to establish a BGP neighbor adjecency. ( can be verified by “sh ip bgp summary” command ) IGP : OSPF , R1 Loopback : 1.1.1.1 , R4 Loopback : 4.4.4.4 R5(config)# router bgp […]

CCNP

BGP Protocol Basics And Implementation

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bgp partial update

BGP is a routing protocol that provides exchanging routes between different autonomous systems. It is known as the “routing protocol of internet” as well. BGP PROPERTIES * BGP uses TCP port 179. * Sends triggered updates (Triggerred updates are sent if only there is a change in the network.) * BGP has a very high […]