IT LABS

This article is just a summarization of 2 other articles that I put on itbundle.net. This time we will try to utilize information about QoS with simple lab.      

Access lists, prefix lists work very well in case we want to filter prefixes, but sometimes you may want to take action not against particular networks, but particular Autonomous Systems. Then AS-PATH filtering is comming forward.

Thanks to MED attribute we have influence on how adjacent eBGP router should get into our AS.It is especially helpful if we have 2 or more eBGP entrance into our AS.  Now, we will check how a single eBGP router that  receives MED attribute for the same prefix from many eBGP speakers and different AS…

ISIS is considered as a protocol only for service providers. Unfairly. Very well scalable, working with different kind of information thanks to TLV is worth to learn even if you are not going to implement its as an underlay routing protocol in MPLS environment.    

Even if we have only single point of failure at the edge it is well to have 2 upstream links. Having 2 upstream links is involved with having 2 VPN tunnels. If one of the tunnel goes down, the second takes over the tasks of the first one.      

In this lab from the scratch we will implement fully working MPLS core with Layer 3 VPN and MP-BGP vpnv4 on the provider edge routers. Also we will achieve full connectivity between customers edge routers with routing protocols. At the end we will find out how to implement “extranets” and “shared services”, thanks to which…

Thanks to this lab with simple topology we will study, how to configure iSCSI protocol in Linux and SAN environment. We gonna pass through iSCSI, Network File System and Server Message Block (SMB) also known as CIFS and at the end of the day we will be able to use  resources in SAN connected to…

Overlay Transport Virtualization is the technology that you may encounter, if you are going to span your Data Center across different geographical location with full retaining of layer 2 information. It literally enables you connectivity between 2 servers within the same Vlan that are placed far away of each other.   

The other way of providing Data Center Interconnectivity besides OTV is VxLAN. VxLAN has ben developed through a few years and despite at the beginning was considered as a solution that enabled spanning VLANs across the single Data Center, nowadays is considered as a solution equal or even better to compare with OTV and enables…

We usually think about multicast in the context of streaming video, audio, gaming, live transmissions, but also routing protocols use multicast to send updates. Moreover, if you are going to deal with Data Center Interconnect,  you gonna come across multicast trafic. But, before we go over the lab let’s get to know what is the…

The difference between phase 2 and 3 regarding DMVPN is slight at a first glance. In this article we will find out how to properly configure Phase 3, especially we focus on  NHRP protocol and its role. At the end we will establish full reachability between 2 spokes with utilization of EIGRP.

Sham Link feature is necessary if we want to deploy backdoor link between 2 OSPFs domains belong to the same area but split by MPLS. The issue that we will come across is a result that backdoor link will have priority over the MPLS.

We may come across on interesting issue if we get the same prefix from external BGP AS and directly via OSPF process. It may happen if we want to have another link to the destination but not neccesarily via another eBGP link. The problem that we will definetely come across on is just  another variation…

MPLS works based on underlying IGP protocol. It may be OSPF or IS-IS, but whatever we choose, we are still dependant to IGP path calculation. Of course we may manipulate the cost of path and this way provide traffic enginering, but MPLS has its own mechanism.

Simple Modular Policy Framework and application inspection enable us for example inspection of FTP connection. When we use passive mode we need beside opened  port 21 as a control channel also any random port as a data channel. Thanks to MPF and  traffic inspection ASA knows what is the number of this random port and entire…

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