IBM 9077 manual On page 212 shows the IP addresses used in our configuration

•If ARP is disabled on the SP Switch network, the IP addresses assigned to the nodes must be determined by the switch node numbers.

Note: The SP Switch Router Adapter card will not properly forward IP data to nodes assigned with an IP address that is in another subnet.

Configuration:

In this scenario, we have the SP Switch of SP21 connected to the GRF 1600. The GRF 1600 has its ATM OC-3c media card’s port 00 connected to the GRF 400 ATM OC-3c media card’s port 00. The GRF 400 in turn is attached to the SP Switch of SP2, as shown in Figure 68 and Table 23 on page 212. The netmask for all interfaces is 255.255.255.0.

	SP		Net 192.168.13.0
Net 10.1.1.2	Switch
ATM OC-3c	Router 1	IP 192.168.13.4	SP processor node
Adapter card		SP Switch Router	SP Switch 1
		Adapter card 1	SP2
		Mask 255.255.255.0
	GRF 400		SP processor node
			Mask 255.255.255.0
	SP		Net 192.168.14.0
Net 10.1.1.1	Switch
	Router 2	IP 192.168.14.4	SP processor node
ATM OC-3c		SP Switch Router	SP Switch 2
Adapter card
		Adapter card 2	SP21
		Mask 255.255.255.0
			SP processor node
	GRF 1600

Figure 68. SP Switch - ATM - SP Switch Connection

Table 23 on page 212 shows the IP addresses used in our configuration.

Multiple RS/6000 SPs and Multiple GRFs 211