PTP 450 Configuration and User Guide
Data network planning
4-34
pmp-0815 (August 2015)
Allocating subnets
The subnet mask is a 32-bit binary number that filters the IP address. Where a subnet
mask contains a bit set to 1, the corresponding bit in the IP address is part of the network
address.
Example IP address and subnet mask
In
the first 16 bits of the 32-bit IP address identify the network:
Table 45
Example of IP address in Class B subnet
Octet 1
Octet 2
Octet 3
Octet 4
IP address 169.254.1.1
10101001 11111110 00000001 00000001
Subnet mask 255.255.0.0 11111111 11111111 00000000 00000000
Selecting non-routable IP addresses
The factory default assignments for network elements are:
Unique MAC address
IP address of 169.254.1.1
Subnet mask of 255.255.0.0
Network gateway address of 169.254.0.0
For each radio and CMMmicro and CMM4, assign an IP address that is both consistent
with the IP addressing plan for your network and cannot be accessed from the Internet. IP
addresses within the following ranges are not routable from the Internet, regardless of
whether a firewall is configured:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255
You can also assign a subnet mask and network gateway for each CMMmicro and CMM4.
Engineering VLANs
The radios support VLAN functionality as defined in the 802.1Q (Virtual LANs)
specification, except for the following aspects of that specification:
The following protocols:
o
Generic Attribute Registration Protocol (GARP) GARV
o
Spanning Tree Protocol (STP)
o
Multiple Spanning Tree Protocol (MSTP)
o
GARP Multicast Registration Protocol (GMRP)
Embedded source routing (ERIF) in the 802.1Q header
Multicast pruning
Flooding unknown unicast frames in the downlink
