Assigning an ip address to a loopback interface – Brocade TurboIron 24X Series Configuration Guide User Manual
Page 483
Brocade TurboIron 24X Series Configuration Guide
449
53-1003053-01
Configuring IP parameters – Layer 3 Switches
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 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 Layer 3 Switch and other devices. You can configure up to eight loopback
interfaces on a Chassis Layer 3 Switch. You can configure up to four loopback interfaces on a
Compact Layer 3 Switch.
You can add up to 24 IP addresses to each loopback interface.
NOTE
If you configure the 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 Layer 3 Switch. Refer to
To add a loopback interface, enter commands such as those shown in the following example.
TurboIron(config-bgp-router)#exit
TurboIron(config)#int loopback 1
TurboIron(config-lbif-1)#ip address 10.0.0.1/24
Syntax: interface loopback
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.
Refer to the syntax description in