RNRP Configuration with explicit addressing
Is it possible to have the RNRP configuration as in the attached sheet.
we have the System Servers with the IP series,Gateway and the subnet mask as below 10.132.25.0, 10.132.25.10, 255.255.255.128 and the secondary for the above servers
10.132.25.128, 10.132.25.130, 255.255.255.128
The clients will be connected using the primary network as
10.132.6.0, 10.132.6.10, 255.255.255.0
The secondary network for the clients will be 10.132.8.0, 10.132.8.10, 255.255.255.0
There are tablets/tabbooks connected using
10.132.10.0, 10.132.10.10, 255.255.255.0
The controllers will be using the below series .For Primary
10.132.14.0, 10.132.14.10, 255.255.255.0 For Secondary
10.132.16.0, 10.132.14.10, 255.255.255.0
Is this a valid configuration?Is so how many Areas to be created?
Are there any specific configurations required?
Voted best answer
RNRP can be used with any IPv4 address having a node number of 500 or LESS.
A 255.255.255.0 subnetwork mask limits the highest possible node number to 254 (excluding the broadcast address).
With a subnetwork mask of 255.255.255.128 even less bits count as node number, the highest possible node number is now 126 (again excluding the broadcast address having all bits set).
The problematic subnetwork masks are having less bits set, eg 255.255.0.0 where the higher 16 bits form the subnet and the remaining lower 16 form the node number. 2^16 is 65535 (actually 65534 is the max node number after excluding the broadcast address).
Using a 255.255.255.0 or larger (more bits set) subnetwork mask guarantees that RNRP will work.
The simple answer is: if the remainder of subtracting (clearing) all the bits belonging to the subnetwork mask from the IP-address is 500 or less, RNRP can be used.
172.16.4.152 BITWISE MINUS 255.255.255.128 = 16 (OK for RNRP)
172.16.4.152 BITWISE MINUS 255.255.252.0 = 152 (OK for RNRP)
172.16.4.152 BITWISE MINUS 255.255.0.0 = 1176 (TOO HIGH for RNRP)
Worth noticing: the node number is never an arbitrary number you can enter as you like, it is ALWAYS the result of the formula IP-address BITWISE MINUS subnetwork. If you change the mask, the node number may also change!
In my opinion, the control and client/server networks are to be considered as proprietary to ABB where ABB can govern the IP addresses. If external communication is required, insert an extra NIC or add a NAT router (eg an ABB NE871) to translate between the ABB internal addresses and what is required on the outside.
There is a lot to gain with using 172.16.x.y/255.255.252.0 suitable for Implicit (=automated) Adressing in RNRP.