User`s guide

Configuring IP Routing
Introduction to IP routing on the Pipeline
Pipeline User’s Guide Preliminary January 30, 1998 2-5
198.5.248.40/29
In the example address shown above, the /29 specification indicates that an
additional 5 bits of the address will be interpreted as a subnet number.
Figure 2-3. A 29-bit netmask and number of supported hosts
Eight bit-combinations are possible in 3 bits. Of those eight possible host
addresses, two are reserved:
000 — Reserved for the network base (the cable)
001
010
100
110
101
011
111 — Reserved for the broadcast address of the subnet
Table 2-2 shows how standard subnet address format relates to Ascend notation
for a class C network number.
Table 2-2. Standard netmasks and Ascend netmask notation
Netmask Ascend notation Number of host addresses
255.255.255.0 /24 254 hosts + 1 broadcast, 1 network base
255.255.255.128 /25 126 hosts + 1 broadcast, 1 network base
255.255.255.192 /26 62 hosts + 1 broadcast, 1 network base