Only one node in the SR redundant pair is instructed to open a peering connection, while the other node keeps the connection to the same peer closed (inactive). A single peering connection from a pair of redundant SR nodes to the same Diameter network peer is essential for unambiguous transport of Diameter messages in an environment with:
a single realm spanning multiple redundant pairs
a pair of redundant SR nodes sharing the same Diameter Identity (DI)
If the open peering connection fails (such as a node reboot or a peer is closed or unavailable), the redundant SR node, upon detection of this event, immediately starts initiating the connection to the same peer.