PCA network capacity can be expanded by adding mated pairs of PCA DSRs. PCA mated pairs added after the PCA network is up and running cannot include additional Binding SBR Servers.
The number of Session SBR Servers must be the same for each of the new PCA mates, and must be determined prior to function enabling. Every PCA mated pair must have the same number of Policy Session SBR Server Groups. After the number is selected the value cannot change until a software upgrade becomes available that supports SBR growth or both functions are disabled.
While SBR growth (adding SBR Server Groups) is not supported, PCA MP servers can be added as needed (up to a maximum of 16 DA-MPs) to support the desired level of Diameter signaling traffic.