Brocade Communications Systems FastIron FGS624P Hardware Installation Manual page 64

Connecting Network Devices and Checking Connectivity
Configuring IP addresses
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 switch 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 – 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
subnet 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 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.
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 Base Layer 3 Switch and other devices. You can
configure up to four loopback interfaces on an FGS device.
You can add up to 24 IP addresses to each loopback interface.
NOTE
If you configure the Brocade device 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 Brocade
device. To add a loopback interface, enter commands such as those shown in the following example:
FastIron(config-bgp-router)# exit
FastIron(config)# interface loopback 1
FastIron(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.
Assigning an IP address to a virtual interface
A virtual interface is a logical port associated with a Layer 3 Virtual LAN (VLAN) configured on a device. You can configure routing
parameters on the virtual interface to enable the switch to route protocol traffic from one Layer 3 VLAN to the other, without using an
external router.
64 Brocade FastIron GS and GS-STK Hardware Installation Guide
Part Number: 53-1002186-03