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Configuring IP Routing
Introduction to IP routing on the MAX
Table 9-1. IP address classes and number of network bits (continued)
Class
Class B
Class C
For example, a class C address, such as 198.5.248.40, has 24 network bits, leaving eight bits
for the host portion of the address. If no subnet mask is specified for a class C address, the
MAX assumes the default mask of 24 bits, as shown in Figure 9-1.
Figure 9-1. Default mask for class C IP address
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
Subnet mask format
To specify a subnet mask, you append a modifier that specifies the number of network bits in
the address. For example:
198.5.248.40/29
In this example, the /29 indicates that 29 bits of the address are used to specify the network.
This is referred to as a 29-bit subnet. The three remaining bits specify unique hosts, as shown
in Figure 9-2.
Figure 9-2. A 29-bit subnet mask and the number of supported hosts
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0
In Figure 9-2, three available bits present eight possible bit combinations. Of the eight possible
host addresses, two are reserved, as follows:
000 — Reserved for the network (base address)
001
010
011
100
101
110
111—Reserved for the broadcast address of the subnet
9-2
Address range
128.0.0.0—191.255.255.255
192.0.0.0—223.255.255.255
Default 24 bits
255 128
32
64
Default 24 bits
5-bit subnet
Network bits
16
24
Number of host addresses
(2 of which are reserved)
16
8
2
4
Total network bits=29
MAX 6000/3000 Network Configuration Guide
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