Basic Configuration
64 Router Configuration Guide
• Configure appropriate routing protocols.
A system interface and network interface should be configured.
System Interface
The system interface is associated with the network entity (such as a specific Alcatel-Lucent
router), not a specific interface. The system interface is also referred to as the loopback
address. The system interface is associated during the configuration of the following entities:
• The termination point of service tunnels
• The hops when configuring MPLS paths and LSPs
• The addresses on a target router for BGP and LDP peering
The system interface is used to preserve connectivity (when routing reconvergence is
possible) when an interface fails or is removed. The system interface is used as the router
identifier. A system interface must have an IP address with a 32-bit subnet mask.
Network Interface
A network interface can be configured on one of the following entities a physical port or
LAG:
• A physical or logical port
• A SONET/SDH channel
For the 7950 XRS, a network interface can be configured on either a physical port or Ethernet
LAG interface.
Basic Configuration
Refer to each specific chapter for specific routing protocol information and command syntax
to configure protocols such as OSPF and BGP.
The most basic router configuration must have the following:
• System name
• System address
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