IS-IS Multi Instance: RFC8202
Multi-Instance IS-IS One of the nice things about IS-IS is the ability to run IPv6 and IPv4 in the same protocol, over a single instance. So long as the two topologies are congruent, deploying v6
On the ‘web: Openfabric and the trash can of the Internet
I sat with Greg Ferro over at Packet Pushers for a few minutes at the Prague IETF. We talked about Openfabric and how we are overusing BGP in many ways, as well as other odds
DC Fabric Segment Routing Use Case (1)
A couple of weeks ago, I attended a special segment routing Networking Field Day. This set me to thinking about how I would actually use segment routing in a live data center. As always, I'm
DR versus DIS: What’s the Diff?
OSPF and IS-IS, both link state protocols, use mechanisms that manage flooding on a broadcast link, as well as simplify the shortest path tree passing through the broadcast link. OSPF elects a Designated Router (or
Flooding Domains versus Areas
At a fundamental level, OSPF and IS-IS are similar in operation. They both build neighbor adjacencies. They both use Dijkstra's shortest path first (SPF) to find the shortest path to every destination in the network.
CAP Theorem and Routing
In 2000, Eric Brewer was observing and discussing the various characteristics of database systems. Through this work, he observed that a database generally has three characteristics— Consistency, which means the database will produce the same