Nuts and Bolts
Database Granularity
- IS-IS database node is an LSPacket
- LSPs are clumps of topology information organized by the originating router
- Always flooded intact, unchanged across all flooding hops (so LSP MTU is an architectural constant--it must fit across all links)
- Small topology changes always yield entire LSPs (though packet size turns out to be much less of an issue than packet count)
- Implementations can attempt clever packing