Enterasys Networks 1G58x-09 - Manual (Page 558)

IP Configuration Command Set
Configuring Routing Interface Settings
12-2 Matrix E1 Series (1G58x-09 and 1H582-xx) Configuration Guide
12.2 IP CONFIGURATION COMMAND SET
12.2.1 Configuring Routing Interface Settings
Basic Routing Interface Properties
The Matrix E1 firmware supports the following routing interface properties:
• Maximum number of (VLAN) routing interfaces: 256
• Maximum number of loopback interfaces: 20
• Maximum number of IP helper addresses per interface: 20
• Maximum number of IP addresses per interface: 1 primary, 8 secondary
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 12-1 .