Cisco Systems A9014CFD manual Configuring Resilient Ethernet Protocol, Overview, 12-1

C H A P T E R 12

Configuring Resilient Ethernet Protocol

Resilient Ethernet Protocol (REP) is a Cisco proprietary protocol that provides an alternative to Spanning Tree Protocol (STP) to control network loops, to respond to link failures, and to improve convergence time. REP controls a group of ports connected in a segment, ensures that the segment does not create any bridging loops, and responds to link failures within the segment. REP provides a basis for constructing more complex networks and supports VLAN load balancing. Effective with Cisco IOS Release 15.4(1)S, the Cisco ASR 901 supports REP over port-channel.

Contents

•Understanding Resilient Ethernet Protocol (REP), page 12-1

•Configuring Resilient Ethernet Protocol (REP), page 12-7

•Configuration Examples for REP, page 12-24

Understanding Resilient Ethernet Protocol (REP)

This section contains the following topics:

•Overview

•Restrictions, page 12-3

•Link Integrity

•Fast Convergence

•VLAN Load Balancing (VLB)

•REP Ports

Overview

An REP segment is a chain of ports connected to each other and configured with a segment ID. Each segment consists of standard (non-edge) segment ports and two user-configured edge ports. A switch can have only two ports belonging to the same segment, and each segment port can have only one external neighbor. A segment can go through a shared medium, but on any link, only two ports can belong to the same segment. REP is supported only on Layer 2 trunk interfaces.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		12-1