Dell BigIron RX Series, Configuration Manual

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162 BigIron RX Series Configuration Guide
53-1002253-01
Configuring IP parameters
7
NOTE
Once you configure a virtual routing interface on a VLAN, you cannot configure Layer 3 interface
parameters on individual ports in the VLAN. Instead, you must configure the parameters on the
virtual routing interface itself.
Also, once an IP address is configured on an interface, the hardware is programmed to route all IP
packets that are received on the interface. Consequently, all IP packets not destined for this device’s
MAC address will not be bridged but dropped.
The device supports both classical IP network masks (Class A, B, and C subnet masks, and so on)
and Classless Interdomain Routing (CIDR) network prefix masks:
•
To enter a classical network mask, enter the mask in IP address format. For example, enter
“209.157.22.99 255.255.255.0” for an IP address with a Class-C subnet mask.
•
To enter a prefix network mask, enter a forward slash (/) and the number of bits in the mask
immediately after the IP address. For example, enter “209.157.22.99/24” for an IP address
that has a network mask with 24 significant bits (ones).
By default, the CLI displays network masks in classical IP address format (example:
255.255.255.0). You can change the display to prefix format. Refer to
“Changing the network mask
display to prefix format” on page 164.
Assigning an IP address to an Ethernet port
To assign an IP address to port 1/1, enter the following commands.
BigIron RX(config)# interface ethernet 1/1
BigIron RX(config-if-e1000-1/1)# ip address 192.45.6.1 255.255.255.0
NOTE
You also can enter the IP address and mask in CIDR format, as follows.
BigIron RX(config-if-e10000-1/1)# ip address 192.45.6.1/24
Syntax: interface ethernet <slot/port>
Syntax: [no] ip address <ip-addr> <ip-mask> | <ip-addr>/<mask-bits> [ospf-ignore | ospf-passive
| secondary]
The ospf-ignore | ospf-passive parameters modify the device defaults for adjacency formation and
interface advertisement. Use one of these parameters if you are configuring multiple IP subnet
addresses on the interface but you want to prevent OSPF from running on some of the subnets.
•
ospf-passive – Disables adjacency formation with OSPF neighbors (but does not disable
advertisement of the interface into OSPF). By default, when OSPF is enabled on an interface,
the software forms OSPF router adjacencies between each primary IP address on the interface
and the OSPF neighbor attached to the interface.
•
ospf-ignore – Disables OSPF adjacency formation and advertisement of the interface into
OSPF. The subnet is completely ignored by OSPF.
Use the secondary parameter if you have already configured an IP address within the same subnet
on the interface.
NOTE
When you configure more than one address in the same subnet, all but the first address are
secondary addresses and do not form OSPF adjacencies.