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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
# of
Bits
Subnet Mask CIDR
Notation
# of
Subnets
# of
Hosts
Total
Hosts
2 255.255.192 /18 2 16382 32764
3 255.255.224.0 /19 6 8190 49140
4 255.255.240.0 /20 14 4094 57316
5 255.255.248.0 /21 30 2046 61380
6 255.255.252.0 /22 62 1022 63364
7 255.255.254.0 /23 126 510 64260
8 255.255.255.0 /24 254 254 64516
9 255.255.255.128 /25 510 126 64260
10 255.255.255.192 /26 1022 62 63364
11 255.255.255.224 /27 2046 30 61380
12 255.255.255.240 /28 4094 14 57316
13 255.255.255.248 /29 8190 6 49140
14 255.255.255.252 /30 16382 2 32764
Table 5-6. Class B Subnet Masks
# of
Bits
Subnet Mask CIDR
Notation
# of
Subnets
# of
Hosts
Total
Hosts
2 255.255.255.192 /26 2 62 124
3 255.255.255.224 /27 6 30 180
4 255.255.255.240 /28 14 14 196
5 255.255.255.248 /29 30 6 180
6 255.255.255.252 /30 62 2 124
Table 5-7. Class C Subnet Masks
Setting up IP Interfaces
The Layer 3 switch allows ranges of IP addresses (OSI layer 3) to be assigned to VLANs (OSI layer 2).
Each VLAN must be configured prior to setting up the corresponding IP interface. An IP addressing
scheme must then be established, and implemented when the IP interfaces are set up on the switch.
An example is presented below:
VLAN Name VID Switch Ports
System (default) 1 5, 6, 7, 8, 21, 22, 23, 24
Engineering 2 9, 10, 11, 12
Marketing 3 13, 14, 15, 16
Finance 4 17, 18, 19, 20
Sales 5 1, 2, 3, 4
Backbone 6 25, 26
Table 5-8. VLAN Example – Assigned Ports
In this case, 6 IP interfaces are required, so a CIDR notation of 10.32.0.0/11 (or a 11-bit) addressing
scheme will work. This addressing scheme will give a subnet mask of
11111111.11100000.00000000.00000000 (binary) or 255.224.0.0 (decimal).
Using a 10.xxx.xxx.xxx IP address notation, the above example would give 6 network addresses and 6
subnets.
Any IP address from the allowed range of IP addresses for each subnet can be chosen as an IP address
for an IP interface on the switch.
For this example, we have chosen the next IP address above the network address:
45