Cisco Evolved Programmable Network System Test Topology Reference Guide, Release 5.0 First Published: 2017-05-30 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883
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CONTENTS CHAPTER 1 Overview 1 Test Topology High-Level Overview 1 CHAPTER 2 Test Topology High-Level Overview 3 Large Network Test Topology Design 3 Small Network Test Topology Design 4 Inter-AS Network Test Topology Design 4 Transport Infrastructure Components 5 iii
Contents iv
CHAPTER 1 Overview This chapter contains the following section: Test Topology High-Level Overview, page 1 Test Topology High-Level Overview The development process for the Cisco Evolved Programmable Network (EPN) system provides extensive validation of various functional aspects of the system design. This validation is conducted on a test bed designed to emulate the characteristics of a converged operator's production network environment. The details of the system test bed are illustrated in this document. The node names, loopback addresses, and other information correlates to the configuration examples shown in this design and implementation guide. 1
Test Topology High-Level Overview Overview The below figure shows a high-level overview of the entire test network topology, illustrating the small, large, and inter-as network scenario. Figure 1: Test Topology High-Level Overview The above figure depicts the various access domains interconnected through pre-aggregation, aggregation, and core domains using access technologies including MPLS with SR/LDP, REP, and G 8032. Each ring runs separate IGP domains with SR/LDP, that are interconnected through BGP LU. There are two autonomous systems in the topology that are interconnected through ASBR nodes such as AS 100 and AS 200. Each autonomous system runs its own services and transport route reflectors with redundancy. Transport route reflector runs BGP LU session to learn and advertise service PE loopbacks. Service route reflector learns service PE loopbacks from transport route reflector using BGP LU and is used to establish BGP neighborship towards service PE for various services. The topology also has the following installed as controllers: Cisco Evolved Programmable Network Manager (EPNM) is used for inventory, service monitoring, and assurance for the service deployed through CLI and NSO. Network Services Orchestrator (NSO) is used for service provisioning. Cisco Software Manager (CSM) is used for the software upgrade and downgrade on XE and XR devices. 2
CHAPTER 2 Test Topology High-Level Overview This chapter contains the following sections: Large Network Test Topology Design, page 3 Small Network Test Topology Design, page 4 Inter-AS Network Test Topology Design, page 4 Transport Infrastructure Components, page 5 Large Network Test Topology Design The below figure shows a detailed view of the large network test bed, with access, pre-aggregation, and aggregation domains in one BGP autonomous system. Figure 2: Large Network Test Topology Design 3
Small Network Test Topology Design Test Topology High-Level Overview Partitioning these network layers into independent and isolated IGP domains helps to reduce the size of routing and forwarding tables on individual routers in these domains, which, in turn, leads to better stability and faster convergence within each of these domains. Intra-domain Label-Switched Paths (LSPs) within the core, aggregation, and access domains are based on segment routing or LDP depending on the use case. Inter-domain LSPs across the core, aggregation, and access domains are based on BGP labeled-unicast, whereas internal BGP (ibgp) labeled-unicast is used within each autonomous system, and exterior BGP (ebgp) labeled-unicast is used to extend the LSP across autonomous system boundaries. Non-MPLS access in the Large Network is implemented as G.8032 or REP enabled access rings and is capable of sub-50 millisecond reconvergence in case of link or node failures. Each ring is terminated to a pair of PAN nodes for Dual Homing and traffic is load shared among PANs based on VLAN service. Small Network Test Topology Design The below figure shows a detailed view of the small network test bed that has the core and aggregation domains integrated into a single SR domain. This integrated domain consists of core nodes (CN) that connect to aggregation nodes (AGN), where the combined number is assumed less than 1000 nodes. Figure 3: Small Network Test Topology Design Inter-AS Network Test Topology Design The below figure shows a detailed view of the Inter-AS large network test bed, with access, pre-aggregation, aggregation, and core domains in one BGP autonomous system (AS100) interfacing through Autonomous 4
Test Topology High-Level Overview Transport Infrastructure Components System Boundary Routers (ASBR) in a different BGP autonomous systems (AS100). Each ring in AS100 runs ISIS as the IGP with segment routing enabled and rings in AS200 runs OSPF with segment routing. Figure 4: Inter-AS Network Test Topology Design Transport Infrastructure Components The various network components with their architectural role and functions are described in the following table: 5
Transport Infrastructure Components Test Topology High-Level Overview Table 1: Network Role Cisco Platform Software Version Functional Description Access Node (AN) ASR920 XE 3.18 MPLS Access: OSPF/ISIS with Segment Routing Unified MPLS BFD, BGP PIC Non-MPLS Access: G 8032 REP Pre-Aggregation Node (PAN) ASR903 XE 3.18 OSPF/ISIS with Segment Routing Unified MPLS BFD, BGP PIC Aggregation Node (AGN) ASR900x XR 6.1.4 OSPF/ISIS with Segment Routing and TI-LFA Unified MPLS BFD, BGP PIC Core Node (CN) ASR900x XR 6.1.4 OSPF/ISIS with Segment Routing and TI-LFA BFD NCS6000 XR 5.2.6 OSPF/ISIS with Segment Routing and TI-LFA BFD 6
Test Topology High-Level Overview Transport Infrastructure Components Network Role Cisco Platform Software Version Functional Description Route Reflector (RR) ASR9001 XR 6.1.4 OSPF/ISIS with Segment Routing Service and Transport route reflector XR Traffic Controller (XTC) xrv9k 6.2.1 PCE ISIS/OSPF with SR BGP 7
Transport Infrastructure Components Test Topology High-Level Overview 8