7705 SAR Routing Configuration Process

The 7705 SAR router can function as an LSR (label switch router), allowing it to be used in more complex networks; for example:

• tier-2 aggregation (aggregator of aggregator sites) – traffic is aggregated from other tier-3 7705 SAR nodes (aggregated small cell sites), and this traffic, along with local traffic, is switched to tier-1 7750 SR nodes

• ring-based configurations – multiple tier-3/tier-2 7705 SAR nodes are linked via a ring and a 7750 SR tier-2/tier-1 node, which acts as a gateway from the ring to a higher level or directly to the MTSO

  Note: For information about the 7705 SAR as an LSR, see the 7705 SAR MPLS Guide.

To switch traffic from one router to another in the network, the 7705 SAR must support IP forwarding. To support these larger and more complex topologies, dynamic routing protocols are provided. The 7705 SAR supports OSPF, IS-IS, BGP, and RIP as dynamic routing protocols.

Configuration Process lists the tasks that are required to configure multicast, OSPF, IS-IS, BGP, and RIP.

This guide is presented in an overall logical configuration flow. Each section describes a software area and provides CLI syntax and command usage to configure parameters for a functional area.