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.
It makes me wonder that what is driving the amazing adventure that human has embarked upon in the field of communication. Why they keep on discovering a new method to communicate better. Since the advent of a SIGN which an ancient human might have used to tell something to his/her friend or enemy, we have… Read More Amazing World of Communication!!
You might have seen issues like choppy voice, unclear deferred video etc in your network. This kind of problem can become a little difficult to isolate because you need to check all the devices in the path and different teams like network admins, voip team, video teams need to collaborate. Very recently I have come… Read More Wireshark: How to Identify RTP stream Packet Drop
Hope you have seen my previous blog about identifying if there is a microbursts in the network or not. If not please visit the post as this one is just an extension from the old post. So, we have seen how to identify the microbursts in the network. Once you identify the microbursts you tend… Read More Wireshark : How to identify Top-talkers in Network.
We come across this situation a lot when we see drops in QOS classes and continuous increase in “Total Output drops” on interfaces but for sure our traffic never crosses CIR rate which ISP provides. This quizzes mostly every network engineer many times in their career. You would see something like this: Router#show interface ten0/0… Read More Wireshark : How to identify burst of traffic in network
In continuation of my last post Trouble Ticket 1 , following is another trouble ticket related to NAT. Please find the details below : Task : In this example we have configured NAT on SITE1 router to translate hosts going out from inside network. This is simplest for of NAT but for some reason the… Read More Cisco IOS IP NAT Trouble Ticket 2
NAT (Network Address Translation) is widely used technology which solves many problems like enabling internal hosts(private IP address range) to communicate with outer world, adding an extra security layer by hiding internal IP address etc. In this blog post I am going to discuss a small but widely common NAT issue. Please see the following… Read More Cisco IOS IP NAT Trouble Ticket 1
There are multiple methods to manage a device like TELNET, SNMP, NETCONF, REST API,HTTP,HTTPS etc . But I think SSH by far is most standard and robust to method. Unlike telnet SSH uses TCP to initiate the connection between the server and client.Once the three way handshake is done basically three steps occur to exchange… Read More Configuring SSH on Cisco devices
In my previous post I have setup a very basic MPLS network. I will use the same setup to explain how exactly MPLS ensures QOS for packets which hit MPLS domain with a tag. Following is the process which occurs when the plane IP packet enters the MPLS domain. Tags available in the IP field… Read More MPLS QOS