It’s time to talk about trunking and native vlan. Well perhaps it would be better if we post this article before VTP but not so much problem i think !Trunking works at Layer-2 of OSI referance model and carries multi vlan information between VLANs. Each frame sets the VLAN information. ( That is known as […]
After overview of EIGRP , it is time to take a look at EIGRP configuration. EIGRP configuration is really awesome and not so hard if you compare with OSPF or etc. Let’s take a look to figure below and configure this topology via EIGRP step by step. Configure the network above with EIGRP using Autonomous system number 90. Use […]
Now we are gonna make another great protocol about switching : STP ( Spanning Tree Protocol ) WHAT IS STP ? STP is a protocol that avoids loops within Layer – 2 communication. The algorithm of the protocol creates a non-loop network to us. In the figure above, you can see two PCs and three […]
STP is a really great feature as you know and after examining PVST, it is time to take a look to RSTP ! The first letter “R” , refers to Rapid ! As you can understand from it’s name, rapid spanning tree is faster than STP. Rapid means that this protocol converges faster. And protocol’s […]
If you have really private traffic and want to isolate it at Layer-2 level , all right, you are welcome to Private VLAN. You can think a private VLAN like “VLAN in a VLAN”.There are many ways to set up security , but PVLANs do it at Layer-2. You can use access-lists , IPS […]
In this article we will deeply check redistribution. First of all we need to know “why redistribution is used”. We use “redistribution” , to have a communication between different routing protocols. For example if we are using multiple protocols like EIGRP , OSPF and etc. and want communication between these protocols, we should use redistribution. […]
Policy based routing is a method for defining path selection due to rules. It is known as the “programming language” of the routers. Policy based routing works based on if / then statements. Check to configuration example above for more information. POLICY BASED ROUTING CONFIGURATION – PC-1 is surfing on internet all day, route that […]
After OSPF Basics it is time to look at “OSPF Neighbor States”. In this article, we will review to step by step OSPF neighbor adjacency. May be you saw the image below before, but we will examine it deeply. 1) First step of “OSPF neighbor states” is determining the “Router ID”s. Both routers determine their router ID’s […]
LOOP GUARD : As you know, if you are using STP, one port is blocked in a topology like this because of preventing loops.But BPDU change continues. In this scenario X refers to blocked port. If cable between B-C is a fibre and just transmit or receive is down, block is removed. So that loop […]
IPv6, which is invented by IETF consists of 128 bit and it is tought that will replace IPv4 in a few years. When IPv4 is invented, it wasn’t beleived that need for public ip addresses will increase rapidly and today, IPv4 addresses are about to finish. That is why IPv6 was invented by IETF. Because […]