Usages of RNRP address Space (SPARE)
We have Crossed over 255 node numbers for 800xA (RNRP ) Nodes in system. We have used 151 to 255 Node Nymbers for controllers. We are adding few more nodes to the same system. In that case can we use SPARE Unused RNRP Address i.e Node nymbers from 256 to 500 in same newtwork without trouble the network.
i.e IP address for controller as 172.16.81.151 to 244 for redundant controllers..
If this is not allowed , what is the best way forward for it?
Never came across such a huge system. So cannot say about SPARE Unused RNRP Address i.e Node nymbers from 256 to 500.
But, you already have crossed Maximum number of nodes allowed in 800xA as per system guide.
Maximum Number of Server and Client Nodes =100
Number of AC800M Controllers = 80
You can freely choose node number in the supported range (1..500) for RNRP.
It is recommended to use the suggested node number assignment scheme (aspect server 1 at 11, connectivity servers start at 21, controllers start at 151, etc) and primarily use the first 255 node numbers since its more difficult to understand that the IP-address 172.16.81.100/255.255.252.0 is a very valid RNRP address and corresponds to node number 356 (100 + 256*1).
Many incorrectly believes that the fourth octet in an IP-address is the node number, this is only true if the mask is 24 bits, i.e. 255.255.255.0.
Backup controllers using the much preferred "Default Rule" will add 0.0.2.0 to the primary's IP-addresses; hence if the primary CPU with node number 356 uses 172.16.81.100, the secondary CPU will assume 172.16.83.100 throwing a node number of 868 (100 + 256 * 3), too high for a "visible" RNRP node but OK for a "hidden" redundant controller "hiding" in the upper 10 bit address space of a 255.255.252.0 subnet mask.
The maximum number of controllers per area is 50 - when using only the CPU stronger PM891 hardware up to a 100 controllers can share the same RNRP area.
These maximum numbers does not include other equipment like printers, management addresses for switches, etc.