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  • Bashir Sheykh thinks this is interesting:

IS-IS uses link-state packets (LSPs) for advertising topology. Open Shortest Path First (OSPF) Protocol uses link-state advertisements (LSAs) for advertising topology.

From

Cover of IP Routing on Cisco IOS, IOS XE, and IOS XR: An Essential Guide to Understanding and Implementing IP Routing Protocols

Note

IS-IS uses Link-state packets (LSPs) for advertising