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Chapter 24
Configuring IP Storage
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About Gigabit Ethernet Interfaces
Both FCIP and iSCSI rely on TCP/IP for network connectivity. On the IPS module, connectivity is
provided in the form of Gigabit Ethernet interfaces that are appropriately configured. This section covers
the steps required to configure IP for subsequent use by FCIP and iSCSI.
A new port mode, called IPS, is defined for Gigabit Ethernet ports on the IPS module. IP storage ports
are implicitly set to IPS mode, so they can only be used to perform iSCSI and FCIP storage functions.
IP storage ports do not bridge Ethernet frames or route other IP packets.
Gigabit Ethernet ports on the IPS module should not be configured in the same Ethernet broadcast
Tip
domain as the management Ethernet port—they should be configured in a different broadcast domain,
either by using separate standalone hubs or switches or by using separate VLANs.
Basic Gigabit Ethernet Configuration
Figure 24-3
Figure 24-3
Switch 1
You can configure the switch to receive and transfer large (or jumbo) frames on a port. The default IP
MTU frame size is 1500 bytes for all Ethernet ports. By configuring jumbo frames on a port, the MTU
size can be increased to 9000 bytes. The following example sets the size to 3000 bytes. Independent of
the MTU size, the IPS module does not pack multiple IP frames (converted to FCIP or to iSCSI).
The minimum MTU size for a port running iSCSI is 512 bytes.
About VLANs for Gigabit Ethernet
Virtual LANs (VLANs) create multiple virtual Layer 2 networks over a physical LAN network. VLANs
provide traffic isolation, security, and broadcast control.
IPS gigabit ethernet ports automatically recognize Ethernet frames with IEEE 802.1Q VLAN
encapsulation. If you need to have traffic from multiple VLANs terminated on one IPS port, configure
subinterfaces—one for each VLAN. Use the VLAN ID as a subscription to the Gigabit Ethernet interface
name to create the subinterface name <the slot-number>/<port-number>.<VLAN-ID>).
OL-7753-01
About VLANs for Gigabit Ethernet, page 24-3
Verifying Gigabit Ethernet Connectivity, page 24-4
Gigabit Ethernet High Availability, page 24-4
Configuring CDP, page 24-6
IPS Core Dumps, page 24-6
depicts a basic Gigabit Ethernet configuration.
Gigabit Ethernet Configuration
10.1.1.100/24
10.1.1.1/24
IP router
10.100.1.1/24
10.100.1.25/24
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
Configuring Gigabit Ethernet Interfaces
IP host
24-3
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