Testing PPPoX and L2TP Broadband Access Devices - Ixia

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3. LNS Performance and Scalability Test 3.1 Test Objective The objective of this test is to emulate multiple LACs to characterize the performance of LNS devices when forwarding 32,000 PPPoX sessions including both control and data plane traffic. The test is split into four phases, namely: • L2TP Tunnel setup, i.e. the rate at which the LNS can terminate 32,000 tunnels. • Tunneled session setup phase, i.e. the rate at which the LACs can initiate 16k L2TP tunnels with or without PAP/Chap authentication. • PPPoX session establishment through L2TP tunnels. • Data plane and keep-alive traffic generation (IMIX and fixed frame sizes at 100% utilization). 3.3 Input Parameters The primary input parameters for each phase include: • PPPoXsession setup rate & latency – maximum, minimum and average time and latency to establish all sessions with either no authentication, PAP or CHAP authentication. • PPPoX interfaces, VLANs and domain groups for access and network ports. • L2TP sessions per tunnel, Hello Request intervals and L2TP data plane options (e.g. UDP source and destination ports). • Traffic generation – upstream/downstream/bi-directional for stateless L3/L4 traffic (IMIX or fixed frame distributions). • Session teardown rate. 3.2 Setup In this test, Test tool emulates multiple LACs creating up to 32,000 L2TP tunnels and then running PPPoX session and data traffic over those tunnels. As depicted in Figure 8, either Ixia Ethernet or ATM ports may be used to simulate the number of subscribers on the access side of the LNS. The network side of the LNS is also connected to either Ixia ATM or Ethernet ports to receive or generate IP traffic. Access Side - PPPoEoL2TP - PPPoEo802.1qoL2TP - PPPoAoL2TP - PPPoAoL2TPoA LNS Network Side - IP (Ethernet, VLAN or ATM RFC 1483) 10/100/1000 Ethernet Or OC3/OC12 ATM 10/100/1000 Ethernet Or OC3/OC12 ATM 10/100/1000 Ethernet Or OC3/OC12 ATM Figure 8: PPPoX client emulation setup 8 Copyright © Ixia, 2004 PoE Test Plan
3.4 Test Methodology and Result Generation • Session setup test: − Test tool to emulate a specified number of LACs with the parameters outlined in Figure 9 below. − Test tool to generate 32,000 L2TP sessions. See Figure 10 for a graphical representation of 32,000 active sessions spread over 24,000 L2TP tunnels. − Test tool to generate 32,000 PPPoX sessions. − Record setup rates and latency measurements outlined in section 1.2. See Figures 2 and 3 for details. − Record the number of sessions in the DUT. Figure 9: LAC parameter definition PoE Test Plan Copyright © Ixia, 2004 9
Page 1 and 2: Testing PPPoX and L2TP Broadband Ac
Page 3 and 4: Overview Modern broadband networks
Page 5 and 6: Figure 3: Latency results − Recor
Page 7 and 8: • Record throughput results. See
Page 9: • Simulate an access link failure
Page 13 and 14: • Traffic generation over PPPoX t
Page 15: 4.4 Test Methodology and Result Gen

Testing PPPoX and L2TP Broadband Access Devices - Ixia

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