Loopback Interfaces In Ospf; Ospf Features Not Supported In This Release - Lenovo RackSwitch G8264 Application Manual

Loopback Interfaces in OSPF

OSPF Features Not Supported in This Release

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G8264 Application Guide for ENOS 8.4
A loopback interface is an IP interface which has an IP address, but is not
associated with any particular physical port. The loopback interface is thus always
available to the general network, regardless of which specific ports are in
operation. Because loopback interfaces are always available on the switch,
loopback interfaces may present an advantage when used as the router ID.
If dynamic router ID selection is used (see "Router ID" on page
interfaces can be used to force router ID selection. If a loopback interface is
configured, its IP address is automatically selected as the router ID, even if other IP
interfaces have lower IP addresses. If more than one loopback interface is
configured, the lowest loopback interface IP address is selected.
Loopback interfaces can be advertised into the OSPF domain by specifying an
OSPF host route with the loopback interface IP address.
To enable OSPF on an existing loopback interface:
RS G8264(config)# interface loopback <1‐5>
RS G8264(config­ip­loopback)# ip ospf area <area ID>
RS G8264(config­ip­loopback)# ip ospf enable
RS G8264(config­ip­loopback)# exit
The following OSPF features are not supported in this release:
 Summarizing external routes
Filtering OSPF routes

 Using OSPF to forward multicast routes
Configuring OSPF on non‐broadcast multi‐access networks (such as frame relay,

X.25, or ATM)
564) loopback