Specifications

IP Configuration Command Set
Configuring Routing Interface Settings
11-2 Matrix DFE-Gold Series Configuration Guide
11.2 IP CONFIGURATION COMMAND SET
11.2.1 Configuring Routing Interface Settings
About Loopback vs. VLAN Interfaces
Loopback interfaces are different from VLAN routing interfaces because they allow you to
disconnect the operation of routing protocols from network hardware operation, improving the
reliability of IP connections. A loopback interface is always reachable. The IP address assigned to
the loopback interface is used as the router ID, which helps when running protocols like OSPF,
because OSPF can be running even when the outbound interface is down. IP packets routed to the
loopback interface are rerouted back to the router or access server and processed locally.
Routing interface configuration commands in this guide will configure either a VLAN or loopback
interface, depending on your choice of parameters, as shown in Table 11-1.
For details on how to enable all router CLI configuration modes, refer back to Table 2-14.
For details on configuring routing protocols, refer to Chapter 12.
Table 11-1 VLAN and Loopback Interface Configuration Modes
For Routing
Interface Type...
Enter (in Global
Configuration Mode)...
Resulting Prompt...
VLAN vlan vlan-id Matrix>Router1 (config-if(Vlan 1))#
Loopback loopback loopback-id Matrix>Router1 (config-if (Lpbk 1))#
Local (software
loopback)
lo local-id Matrix>Router1 (config-if (Lo 1))#
NOTE: The command prompts used in examples throughout this guide show a system
where module (or standalone device) 1 and VLAN 1 have been configured for routing.
The prompt changes depending on your current configuration mode, the specific
module, and the interface types and numbers configured for routing on your system.