- Preface
- Product Overview
- Configuring the Router for the First Time
- Configuring a Supervisor Engine 720
- Configuring a Route Switch Processor 720
- Configuring NSF with SSO Supervisor Engine Redundancy
- ISSU and eFSU on Cisco 7600 Series Routers
- Configuring RPR and RPR+ Supervisor Engine Redundancy
- Configuring Interfaces
- Configuring a Supervisor Engine 32
- Configuring LAN Ports for Layer 2 Switching
- Configuring Flex Links
- Configuring EtherChannels
- Configuring VTP
- Configuring VLANs
- Configuring Private VLANs
- Configuring Cisco IP Phone Support
- Configuring IEEE 802.1Q Tunneling
- Configuring Layer 2 Protocol Tunneling
- Configuring L2TPv3
- Configuring STP and MST
- Configuring Optional STP Features
- Configuring Layer 3 Interfaces
- Configuring GTP-SLB IPV6 Support
- IP Subscriber Awareness over Ethernet
- Configuring UDE and UDLR
- Configuring Multiprotocol Label Switching on the PFC
- Configuring IPv4 Multicast VPN Support
- Configuring Multicast VPN Extranet Support
- Configuring IP Unicast Layer 3 Switching
- Configuring IPv6 Multicast PFC3 and DFC3 Layer 3 Switching
- Configuring IPv4 Multicast Layer 3 Switching
- Configuring MLDv2 Snooping for IPv6 Multicast Traffic
- Configuring IGMP Snooping for IPv4 Multicast Traffic
- Configuring PIM Snooping
- Configuring Network Security
- Understanding Cisco IOS ACL Support
- Configuring VRF aware 6RD Tunnels
- Configuring VLAN ACLs
- Private Hosts (Using PACLs)
- Configuring IPv6 PACL
- IPv6 First-Hop Security Features
- Configuring Online Diagnostics
- Configuring Denial of Service Protection
- Configuring DHCP Snooping
- Configuring Dynamic ARP Inspection
- Configuring Traffic Storm Control
- Unknown Unicast Flood Blocking
- Configuring PFC QoS
- Configuring PFC QoS Statistics Data Export
- Configuring MPLS QoS on the PFC
- Configuring LSM MLDP based MVPN Support
- Configuring IEEE 802.1X Port-Based Authentication
- Configuring IEEE 802.1ad
- Configuring Port Security
- Configuring UDLD
- Configuring NetFlow and NDE
- Configuring Local SPAN, RSPAN, and ERSPAN
- Configuring SNMP IfIndex Persistence
- Power Management and Environmental Monitoring
- Configuring Web Cache Services Using WCCP
- Using the Top N Utility
- Using the Layer 2 Traceroute Utility
- Configuring Bidirectional Forwarding and Detection over Switched Virtual Interface
- Configuring Call Home
- Configuring IPv6 Policy Based Routing
- Using the Mini Protocol Analyzer
- Configuring Resilient Ethernet Protocol
- Configuring Synchronous Ethernet
- Configuring Link State Tracking
- Configuring BGP PIC Edge and Core for IP and MPLS
- Configuring VRF aware IPv6 tunnels over IPv4 transport
- ISIS IPv4 Loop Free Alternate Fast Reroute (LFA FRR)
- Multicast Service Reflection
- Y.1731 Performance Monitoring
- Online Diagnostic Tests
- Acronyms
- Cisco IOS Release 15S Software Images
- Index
Configuring Resilient Ethernet Protocol
This chapter describes how to configure the Resilient Ethernet Protocol in Cisco IOS Software Release 15.0(1)S.
Understanding Resilient Ethernet Protocol
Resilient Ethernet Protocol (REP) is a Cisco proprietary protocol that provides an alternative to Spanning Tree Protocol (STP) to support L2 resiliency and fast failover with Ethernet networks. REP provides functionality to:
An REP segment is a connected chain of ports configured with a segment ID. Each segment consists of standard (non-edge) segment ports and two user-configured edge ports. REP is supported on Layer 2 trunk interfaces and EVC ports. 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. REP extends the network resiliency across Cisco IP Next-Generation Network (NGN) Carrier Ethernet Design. REP is designed to provide network and application convergence within 50 to 200 ms. REP is a segment protocol that integrates easily into existing Carrier Ethernet networks. It allows network architects to limit the scope of STP domains. REP can also notify the STP about potential topology changes, allowing interoperability with Spanning Tree.
REP is a distributed and secure protocol and does not rely on a master node controlling the status of the ring. Hence, the failures can be detected locally either through loss of signal (LOS) or loss of neighbor adjacency. Any REP port can initiate a switchover after acquiring the secure key to unblock the alternate port. An REP segment is a chain of ports connected to each other and configured with the same segment ID. Each end of a segment terminates on an edge switch. The port where the segment terminates is called the edge port.
REP Edge No-Neighbor
Effective from Cisco IOS release 15.1.(01)S, a new functionality provides capability to configure the non-rep switch facing ports as edge no-neighbor ports. These ports inherits the properties of edge ports, and overcomes the limitation of not being able to converge quickly during a failure.
Figure 67-1 Edge No-Neighbor Ports
In access ring topologies, the neighboring switch might not support REP, as shown in Figure 59-1. In this case, you can configure the non-REP facing ports (E1 and E2) as edge no-neighbor ports. These ports inherit all properties of edge ports, and you can configure them the same as any edge port, including configuring them to send STP or REP topology change notices to the aggregation switch. In this case the STP Topology Change Notice (TCN) that is sent is a Multiple Spanning-Tree (MST) STP message.
Configuring Resilient Ethernet Protocol
For information on Configuring REP over Ethernet Virtual Circuit, see: http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap4.html
For information on Configuring Resilient Ethernet Protocol Configurable Timers, see: http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap4.html#wp1607518