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52-6
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 52 Configuring IP Storage
Configuring Gigabit Ethernet Interfaces for IPv4
Note The minimum MTU size is 576 bytes.
Tip MTU changes are disruptive, all FCIP links and iSCSI sessions flap when the software detects a change
in the MTU size.
Configuring Promiscuous Mode
You can enable or disable promiscuous mode on a specific Gigabit Ethernet interface. By enabling the
promiscuous mode, the Gigabit Ethernet interface receives all the packets and the software then filters
and discards the packets that are not destined for that Gigabit Ethernet interface.
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.
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 Gigabit Ethernet port,
configure subinterfaces—one for each VLAN.
If the IPS module or MPS-14/2 module is connected to a Cisco Ethernet switch, and you need to have
traffic from multiple VLANs coming to one IPS port, verify the following requirements on the Ethernet
switch:
• The Ethernet switch port connected to the IPS module or MPS-14/2 module is configured as a
trunking port.
• The encapsulation is set to 802.1Q and not ISL, which is the default.
Use the VLAN ID as a subscription to the Gigabit Ethernet interface name to create the subinterface
name (the
<slot-number>
/<port-numb
er>.<VLAN-I
D>
).Interface Subnet Requirements
Gigabit Ethernet interfaces (major), subinterfaces (VLAN ID), and management interfaces (mgmt 0) can
be configured in the same or different subnet depending on the configuration (see Table 52-1).
Table 52-1 Subnet Requirements for Interfaces
Interface 1 Interface 2
Same Subnet
Allowed Notes
Gigabit Ethernet 1/1 Gigabit Ethernet 1/2 Yes Two major interfaces can be configured in the same
or different subnets.
Gigabit Ethernet 1/1.100 Gigabit Ethernet 1/2.100 Yes Two subinterfaces with the same VLAN ID can be
configured in the same or different subnets.
Gigabit Ethernet 1/1.100 Gigabit Ethernet 1/2.200 No Two subinterfaces with different VLAN IDs cannot
be configured in the same subnet.
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