Foundry Configuration Guide for the FESX, FSX, and FWSX
16 - 18 © Foundry Networks, Inc. December 2005
FastIron SuperX Router(config-if-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:
FastIron SuperX Router(config-if-1/1)# ip address 192.45.6.1/24
Syntax: [no] ip address <ip-addr> <ip-mask> [ospf-ignore | ospf-passive | secondary]
or
Syntax: [no] ip address <ip-addr>/<mask-bits> [ospf-ignore | ospf-passive | secondary]
The ospf-ignore | ospf-passive parameters modify the Layer 3 Switch defaults for adjacency formation and
interface advertisement. Use one of these parameters if you are configuring multiple IP sub-net addresses on the
interface but you want to prevent OSPF from running on some of the sub-nets.
• ospf-passive – This option disables adjacency formation with OSPF neighbors. 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 – This option disables OSPF adjacency formation and also disables advertisement of the
interface into OSPF. The sub-net is completely ignored by OSPF.
NOTE: The ospf-passive option disables adjacency formation but does not disable advertisement of the
interface into OSPF. To disable advertisement in addition to disabling adjacency formation, you must use the
ospf-ignore option.
Use the secondary parameter if you have already configured an IP address within the same sub-net on the
interface.
NOTE: When you configure more than one address in the same sub-net, all but the first address are secondary
addresses and do not form OSPF adjacencies.
Assigning an IP Address to a Loopback Interface
Loopback interfaces are always up, regardless of the states of physical interfaces. They can add stability to the
network because they are not subject to route flap problems that can occur due to unstable links between a Layer
3 Switch and other devices. You can configure up to eight loopback interfaces on a Chassis Layer 3 Switch and up
to four loopback interfaces on a Stackable Layer 3 Switch.
You can add up to 24 IP addresses to each loopback interface.
NOTE: If you configure the Foundry Layer 3 Switch to use a loopback interface to communicate with a BGP4
neighbor, you also must configure a loopback interface on the neighbor and configure the neighbor to use that
loopback interface to communicate with the Foundry Layer 3 Switch. See “Adding a Loopback Interface” on
page 21-11.
To add a loopback interface, enter commands such as those shown in the following example:
FESX424 Router(config-bgp-router)# exit
FESX424 Router(config)# int loopback 1
FESX424 Router(config-lbif-1)# ip address 10.0.0.1/24
Syntax: interface loopback <num>
The <num> parameter specifies the virtual interface number. You can specify from 1 to the maximum number of
virtual interfaces supported on the device. To display the maximum number of virtual interfaces supported on the
device, enter the show default values command. The maximum is listed in the System Parameters section, in
the Current column of the virtual-interface row.
See the syntax description in “Assigning an IP Address to an Ethernet Port” on page 16-17.
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