Assigning an ip address to a loopback interface, Assigning an ip address to a virtual interface – Brocade BigIron RX Series Configuration Guide User Manual
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BigIron RX Series Configuration Guide
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Configuring IP parameters
7
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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.
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 device and other devices.
You can configure up to eight loopback interfaces on a device.
You can add up to 24 IP addresses to each loopback interface.
NOTE
If you configure the 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 device. Refer to
page 866 in the BGP4 chapter.
To add a loopback interface, enter commands such as those shown in the following example.
BigIron RX(config-bgp-router)# exit
BigIron RX(config)# int loopback 1
BigIron RX(config-lbif-1)# ip address 10.0.0.1/24
Syntax: interface loopback <num>
For the syntax of the IP address, refer to
“Assigning an IP address to an Ethernet port”
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.
NOTE
Other sections in this chapter that describe how to configure interface parameters also apply to
virtual interfaces.
NOTE
The device uses the lowest MAC address on the device (the MAC address of port 1 or 1/1) as the
MAC address for all ports within all virtual interfaces you configure on the device.