Networking & Security

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…

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…

In this artcile we will focus on fundamental and crucial features of BGP neighborhood establishing and routes injecting into BGP processes, we also break BGP table down  for better understanding.

Cisco recently has made a small step to improve ASA  and has implemented logical tunnels, what means we got route based VPN! Really? Did we?  Not so fast. Yes, we got route based VPN but still we have to add  routes manually.

Each protocol has to calculate somehow the metric  in order to choose the best route. So we have the cost in OSPF, K-values in EIGRP, BGP doesn’t differ from them and also calculate the best route, but the metric of BGP is much more complicated.

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