I wrote few blogs on BGP EVPN and also on VxLAN earlier. My previous blogs were focused on IOS-XE and IOS-XR devices, recently I have started my Data Center journey and hence I wanted to do some labs on Nexus devices as well and what better place than GNS3 for this ? I got to… Read More GNS3 LAB Cisco : Nexus 9000v Control-plane based VxLAN BGP-EVPN Bridging Config and Verification.
So far we have seen EVPN single home and EVPN multihome setup and configuration with Cisco csr1000v router. You can find the links for those posts below. EVPN -Single home GNS3 LAB Cisco : BGP-EVPN Single Home Configuration EVPN -Multi homeGNS3 Lab Cisco : EVPN Multihome Concept and Configurations Note : As per Cisco docs… Read More GNS3 LAB Cisco : EVPN (BGP/MPLS) IRB (integrated routing and bridging) Configuration and Verification.
Introduction: This article is focused on multi-homed EVPN setup that I have prepared in below network topology. One of the biggest advantage with EVPN that we get is multi-homing with it. Earlier with VPLS we did not have multi-homing integrated with the protocol. With multi-homing we can have one CE connected to two PE router… Read More GNS3 Lab Cisco : EVPN Multihome Concept and Configurations
My love hate relationship with GNS3 has come to a next level!! I have a server like configuration on my Ubuntu Machine , it has 64 GB memory so enough for my GNS3 practices.I used to VNC to this machine and run GNS3 on it. This was working just fine but since the day I… Read More How to Run GNS3 in Client Server Mode
Address-Family in BGP has given immense power to bgp, the most important thing is simplicity of the solutions. One example of this is inter-vrf routing with the help of address family. Following is the configuration. Tools : GNS3, Router: IOSv Router. In the above diag Cus1 and Cus2 are two separate vrfs on PE router.… Read More GNS3-Cisco Configuration: Inter-vrf Routing with MP-BGP
Cisco ASR900 series is a popular platform in service provider domain. If you remember the famous 7600 platform, ASR 900(ASR903/907and 914) is next generation to it. Majorly these devices are classified as SP access platforms. ASR 903 routers are known for high speed data plane(forwarding) because of the ASIC based data plane architecture. In this… Read More Cisco ASR 903 Series router ISSU upgrade
We know that for most of the protocols router does not change anything in the IP header unless we have specifically configured the IP header to be changed for example NAT, QOS markings etc. In this and few upcoming posts we will specifically look for packet marking when the IP packet gets translated into MPLS… Read More MPLS Basic configuration and MPLS QOS
DMVPN or Dynamic multipoint VPN is a widely used technology. In this article I will explain why do we need it and how to configure it. Problem-1 : You have huge number of sites and you add and delete sites on daily basis. You connect those sites with GRE tunnels. Do you think adding and… Read More Cisco DMVPN Configuration and verification
What I have read and know till now is since ospf behaves like distance vector protocol for inter area communication hence it is vulnerable to routing loops that’s why all the ABRs must be connected to ospf area0 and interarea communication happens through backbone area ….but you may ask that how distance vector in inter… Read More Question : Why all other areas must be connected to ospf area 0(backbone)?
On this blog I would like to discuss few basic details of ospf which everybody needs to know and which is very helpful to build the concepts of OSPF. For this we are going to use below reference GNS 3 topology. Question 1 : How and when the information about the ABR and ASBR is… Read More OSPF : Few basic questions…