Feature Description

UPF supports Layer 2-based (L2) ICSR in a two-server architecture to disambiguate packet forwarding between Active and Standby UPFs. UPF uses Gratuitous Address Resolution Protocol (GARP) and Unsolicited Neighbor Advertisement messages to achieve L2 ICSR.

L2 ICSR between SRP peers is configurable in the SRP context. UPF also configures a loopback interface under the same subnet as that of the physical interface. UPF supports SRP BFD monitoring to avoid the Active to Active scenario.