ISIS Two Stack Configuration
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IP Address Classes
You need a subnet with enough IP addresses to accommodate the number of engines, clients, and
devices you are connecting to your ISIS shared storage environment. A Class C network
typically provides 254 usable addresses. Your shared storage environment might need a larger
block of IP addresses than a Class C network provides. The pool of addresses in a Class B
network would be much larger than required.
A 24 engine ISIS configuration uses a minimum of 408 IP addresses. If you plan on over 170
clients you need to use a /22 or larger Network range (a /22 can accommodate 1024 addresses).
The subnet examples shown in this chapter use VLAN 100 and VLAN 200 with a Subnet Mask
of 255.255.252.0 to accommodate the possible IP addresses needed for 24 engines. The other
chapters in this guide use VLAN 10 and VLAN 20 with a Subnet Mask of 255.255.255.0 which
does not include enough IP addressed for all the ISIS blades and maximum client count.
IP Addressing With Two Stacks
The IP addressing scheme engines are described in
“IP Addressing Overview” on page 80
section expands the system and configuration to include up to 24 engines. The first table
provides a review of the engine numbering scheme. The second table is an example on the
engines configured into two stacks.
Example of a Single Engine IP Address Assignments
ISB 0
192.168.100.10 (left side)
192.168.200.10 (right side)
ISB 1
192.168.100.11 (left side)
192.168.200.11 (right side)
ISB 2
192.168.100.12 (left side)
192.168.200.12 (right side)
ISB 3
192.168.100.13 (left side)
192.168.200.13 (right side)
ISB 4
192.168.100.14 (left side)
192.168.200.14 (right side)
ISB 5
192.168.100.15 (left side)
192.168.200.15 (right side)
ISB 6
192.168.100.16 (left side)
192.168.200.16 (right side)
ISB 7
192.168.100.17 (left side)
192.168.200.17 (right side)
ISB 8
192.168.100.18 (left side)
192.168.200.18 (right side)
ISB 9
192.168.100.19 (left side)
192.168.200.19 (right side)
ISB 10
192.168.100.20 (left side)
192.168.200.20 (right side)
ISB 11
192.168.100.21 (left side)
192.168.200.21 (right side)
ISB 12
192.168.100.22 (left side)
192.168.200.22 (right side)
ISB 13
192.168.100.23 (left side)
192.168.200.23 (right side)
ISB 14
192.168.100.24 (left side)
192.168.200.24 (right side)
ISB 15
192.168.100.25 (left side)
192.168.200.25 (right side)
Switch (ISS or IXS)
192.168.100.26
Switch (ISS or IXS)
192.168.200.26
