ISIS
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol designed for large service provider and enterprise backbone networks to efficiently move data packets.
Explore different ISIS blog posts:
- ISIS – Cheat Sheet
- ISIS – PDUs and sample packets
- ISIS – Authentication
- ISIS – MTU and Hello Padding
- ISIS – Adjacency Requirements
- ISIS – Attached Bit
- ISIS – L1/L2 Redistribution and summarization
- ISIS Metric – 1st trap of Narrow and Wide metrics
- ISIS Metric – 2nd trap, the unexpected impact of wide-metrics-only
- ISIS Metric – 3rd trap, the differences between IPv4 and IPv6
- ISIS Overload – Learn with a practical example
- ISIS Overload – Testing the timeout knob
Stay tuned for more.
ISIS Overload – Learn with a practical example
1. Intro The Overload statement causes the routing device to continue participating in IS-IS routing, but prevents it from being used for transit traffic. It is useful sometimes to deviate the traffic away from a particular router, so we can avoid traffic being impacted. We typically have 2 scenarios: Bonus scenario: ISIS will make this […]
ISIS – PDUs and Wireshark sample packets
Intermediate systems send and receive packets and relay (forward) packets. ISO packets are called ISIS Protocol Data Unit packets, or in short ISIS PDU. There are four PDU types and all share a common header. This common header has the same structure and information for all four PDU types, except the ‘PDU Type’ filed as […]