In many ways, IS-IS is a simpler, and perhaps more elegant, routing protocol than OSPF. However, it often gets misunderstood. Perhaps due to its roots in OSI or perhaps because it’s not as widely deployed as OSPF. Some of the
VXLAN/EVPN – Host routing
In an previous post Advertising IPs In EVPN Route Type 2, I described use cases for advertising IP addresses in EVPN route type 2. Host ARP and host mobility I already covered so today we will focus on host routing.
Route Replication the Easy Way
Easy Virtual Network (EVN) was a technology Cisco came up with back in the days to make it easier to implement VRFs without the pain of running VRF lite or the complexity of running a full MPLS + BGP network.
How Difficult is SD-WAN?
In a recent Packet Pushers Heavy Networking episode, Ethan and Greg discussed how difficult SD-WAN is, and why you shouldn’t outsource your SD-WAN to a MSP. So, how difficult is really SD-WAN? Now, this is of course going to depend
General – Advice on Numbering Policies in Networking
There are several situations where we need to write some form of policy such as QoS, routing policies used in for example redistribution, filtering and policy-based routing, dot1x and so on. Lately I had to update a policy used by
CCNA – Operation of IP Data Networks 1.1
We kick off the CCNA series from the beginning. Operation of IP data networks is weighted as 5% in the CCNA RS blueprint. The first topic is: 1.1 Recognize the purpose and functions of various network devices such as routers,
IPv6 operation and best practices – documents to read
Unfortunately I don’t get to do much v6 at my job yet but I still like to stay updated on what is happening. Do you run any v6 in your network? If so, do you run it native or tunneled
EIGRP named configuration
You might think that EIGRP being around for so long is not getting any attention from Cisco, not true. EIGRP is still being developed and in later releases you can run what is called named configuration. Doing this you can
Tiebreakers with routes from different OSPF processes
This post is inspired by a discussion at Twitter with Ivan Pepelnjak and Nicolas Michel. Nicolas asked what happens when there is the same route from two different OSPF processes. Which one will be selected? Ivan explained how to use
OSPF – Use of forwarding address
In OSPF and other routing protocols we have something called forwarding address. This can be used to route traffic in another direction than to the router that originated the LSA. We start with the following topology. It’s a basic OSPF