Currently, the support for graceful insertion and removal (GIR) within a Protocol-Independent Multicast (PIM) environment is limited. As a result, there is no mechanism today that allows for a soft migration of flows when, for example, planning for a maintenance window. Techniques are presented herein that support a hitless upgrade capability that avoids impacting any flow during the upgrade and reload of a spine switch. This is the most difficult task today for customer networks, where multicast flows run all of the time and no disruption is acceptable. Aspects of the presented techniques include a new PIM hello message type-length-value (TLV) option. Such an option may be referred to herein as a progressive graceful insertion and removal (PGIR) capability option.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.