|Exam Name||:||Alcatel-Lucent Multicast Protocols|
|Questions and Answers||:||247 Q & A|
|Updated On||:||April 19, 2019|
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tests exhibit Packet-based mostly Backhaul Networks Can satisfy Synchronization necessities under precise-World situations
CALABASAS, CA--(Marketwire - Feb sixteen, 2012) - Ixia (NASDAQ: XXIA), the main world issuer of converged IP and wireless network examine options, these days introduced it participated in a look at various of mobile backhaul packet synchronization with Alcatel-Lucent. The demonstration highlighted that the Alcatel-Lucent cell Backhaul answer can hold accurate phase synchronization and excellent of carrier (QoS) guarantees, while present process verify conditions concerning extreme packet congestion and network failovers. For extra tips about this test seek advice from Ixia's sales space (hall 1, 1E47) and Alcatel-Lucent's sales space (corridor 6, 6C23) at cellular World Congress 2012 in Barcelona, Spain from February 27 - March 1.
reliable distribution of packet synchronization is crucial to the operation of advanced mobile broadband communications: it's required to be certain seamless mobility and permit new services comparable to people who leverage the LTE Multimedia Broadcast Multicast features (MBMS) capabilities. one of the vital traumatic packet synchronization environments is one which addresses the phase synchronization requirements for LTE TDD and LTE MBMS over a backhaul community which include microwave links.
Carriers are replacing legacy TDM-primarily based cellular backhaul networks with IP/Ethernet-primarily based options in order to charge-easily scale their networks and accommodate bandwidth-hungry cell instruments. correct timing synchronization throughout the network is vital for the successful operation of cell networks. network devices are imposing IEEE 1588v2 to achieve accurate clock synchronization for each frequency and part (time of day), but 1588v2 implementations can become strained in big network environments that encompass many slave clocks synchronizing to a master clock. Timing synchronization and service start can also be compromised throughout network failover and restoration. it's vital to look at various each the scalability of 1588v2 implementations, as smartly because the pace of clock alignment following network failure, to make sure the steadiness of network functions and SLA compliance.
Verifying the reliability and accuracy of a 1588v2 clock implementation requires repeatable trying out beneath true-world community situations over long test intervals. Ixia demonstrated Alcatel-Lucent's cell Backhaul answer the usage of its IxNetwork application with full IEEE 1588v2 protocol emulation. The demonstration reflects a customary multi-equipment backhaul deployment -- from network entry through aggregation, including the 7705 service Aggregation Router, 7210 service entry Switches, 9500 Microwave Packet Radio, and 7750 carrier Router. verify Composer, integrated within Ixia's IxNetwork software, tightly managed and automatic all examine sequences and routine -- together with site visitors generation, slave clock emulation, link screw ups, and clock measurements. IxNetwork's Macro Recorder made it convenient to checklist and translate consumer GUI movements into look at various Composer commands. These two fresh IxNetwork aspects helped make sure look at various consequences have been repeatable and professional over assorted iterations.
About Ixia Ixia offers the trade's most comprehensive converged IP functions trying out answer -- from the instant area to the cyber web core. network gadget producers, service providers, businesses, and govt companies use Ixia's industry-main check and simulation structures to design and validate a large range of wired, Wi-Fi, and 3G/4G networking device and networks. Ixia's solutions create true-world conditions with the aid of emulating a full latitude of high-scaling networking protocols and generating media-rich software site visitors to validate performance, conformance and security of cloud, core, information core, instant and multiplay networks. For greater guidance, visit www.ixiacom.com.
Ixia and the Ixia 4-petal logo are registered logos or emblems of Ixia. other emblems are the property of their respective homeowners.
TestersSANTA CLARA, Calif., can also 9, 2007 -- Agilent technologies Inc. (NYSE: A) nowadays introduced that its N2X multiservices check answer changed into used by using Isocore Corp. to validate the efficiency of the Alcatel-Lucent Triple Play service delivery structure (TPSDA). The N2X was the exclusive examine gadget employed in Isocore's impartial evaluation of the forwarding performance, carrier prioritization and restoration mechanisms of the Alcatel-Lucent TPSDA.
The verify became the primary within the business to validate a complete end-to-end network structure below a particularly scaled mixture of residential triple play and commercial enterprise VPN functions. The ensuing examine measurements offer provider providers fantastic perception into how the community structure will operate in true-world deployment scenarios, and provides confidence that capabilities can meet subscribers' exceptional expectations.
Emulating the architecture, subscriber profiles, traffic forms and protocol state features of contemporary multi-carrier networks inside a controlled lab atmosphere turned into a big challenge. The test bed covered numerous Alcatel-Lucent 7750 service Routers and 7450 Ethernet carrier Switches, as well as 58 GbE/10 GbE ports of the Agilent N2X. Isocore chose N2X for its capacity to simulate, scale and make measurements for the magnitude of subscribers and service site visitors required to emulate mass deployment conditions.
"before service suppliers install IPTV and different multi-play services, they want the self assurance that their network can deliver those services at scale and with the exceptional their customers are expecting," noted Rod Unverrich, company manager of Agilent's information Networks Operation. "N2X makes it possible for NEMs and service suppliers to charge-easily simulate the size and complexity of actual-world multi-play deployments and validate that their network architectures can meet strict performance, reliability and QoS requirements."
"The scalability and value of the Agilent N2X turned into pivotal in evaluating the performance of the Alcatel-Lucent Triple Play service delivery structure," spoke of Dr. Bijan Jabbari, president of Isocore. "We wanted this to be the industry's most comprehensive and legitimate evaluation of a working triple play network. N2X geared up us with the capacity to directly emulate a really tremendous variety of triple play subscribers with distinctive profiles and generate multi-class site visitors to create a extremely sensible verify ambiance."
Agilent's N2X examine measurements confirm that the Alcatel-Lucent TPSDA performed very well below extreme scaling situations. site visitors forwarding measurements that were run repetitively and overnight confirmed minimal latency and low packet loss. Media delivery Index video excellent metrics have been used to validate that high-quality of journey expectations have been met on a per-subscriber basis. the whole Isocore check report, including test parameters, is obtainable at http://www.isocore.com/papers2.htm.
experts from Isocore, Alcatel-Lucent and Agilent might be purchasable to talk about the key consequences and instructions learned from these validation exams as a part of a one-hour gentle reading webinar entitled "placing the Alcatel-Lucent TPSDA to the check" on may 31, 2007. From this webinar, carrier providers evaluating converged community solutions for mass deployment will be trained in regards to the test methodology used during this finished end-to-conclusion examine to measure and validate key efficiency metrics on scalability, fault resilience, subscriber management and high-quality of event.
extra particulars are available at www.agilent.com/discover/n2x.
The Agilent N2X helps NEMs and repair providers increase the time to market and first-class of triple play service deployments with the aid of:
o simulating tens of hundreds of subscribers;o emulating dynamic subscriber behaviors reminiscent of channel zapping, new web connection requests and DHCP session flapping;o generating multi-classification triple play video, voice and internet traffic, together with 500 channels of general and excessive-definition video and stateful TCP traffic;o inspecting multi-class site visitors-forwarding efficiency for lots of subscribers per port, together with Media delivery Index metrics for IPTV;o scaling multicast traffic, IGMP and multicast routing protocols to check even if a community answer is equipped for frequent production roll-out; ando replaying captured video and using protocol decodes to obtain more desirable insight into efficiency problems.
The Agilent N2X is complemented through a wide portfolio of Agilent check options to provide a holistic approach to measuring and monitoring video provider first-rate from R&D and lab-based efficiency validation, through to provider assurance and network troubleshooting.
additional info about Agilent's triple play test solutions is purchasable at www.agilent.com/locate/tripleplay.
U.S. Pricing and AvailabilityThe Agilent N2X multiservices solution is obtainable at a starting expense of $20,000.
extra advice is at www.agilent.com/discover/n2x.
About IsocoreIsocore provides technology validation, certification and product comparison features in rising and subsequent-era information superhighway and wireless technologies. Isocore is main validation and interoperability of novel applied sciences including service Ethernet, IPv6, IP Optical Integration, wireless backhauling and Layer 2/3 digital inner most Networks (VPNs), and at the moment specializes in IPTV provider deployment structure validation and design. most important router and swap companies, carrier suppliers, and test equipment suppliers take part in Isocore actions. Isocore has major workplaces in the U.S., Europe and Asia.
About Agilent TechnologiesAgilent technologies Inc. (NYSE: A) is the realm's premier dimension enterprise and a expertise chief in communications, electronics, existence sciences and chemical analysis. The business's 19,000 employees serve purchasers in additional than a hundred and ten nations. Agilent had web profits of $5.0 billion in fiscal 2006.
information about Agilent is available on the web at www.agilent.com.linked Thomas industry update
might also 10, 2007 -- Agilent technologies Inc.'s (seek Agilent applied sciences) N2X multiservices check platform was used through Isocore Corp. to validate the efficiency of the Alcatel-Lucent Triple Play carrier start structure (TPSDA). according to Isocore, the N2X changed into the unique verify gadget employed in its independent contrast of the forwarding efficiency, provider prioritization, and recovery mechanisms of the Alcatel-Lucent TPSDA.
according to the companies concerned, the test turned into the primary within the industry to validate an entire end-to-conclusion network architecture under a scaled mixture of residential triple-play and enterprise VPN services.
Emulating the structure, subscriber profiles, site visitors varieties, and protocol state traits of today's multi-provider networks within a controlled lab atmosphere was a significant problem, say the groups. The check mattress protected multiple Alcatel-Lucent 7750 service Routers and 7450 Ethernet carrier Switches, in addition to fifty eight Gigabit Ethernet (GbE)/10-GbE ports of the Agilent N2X (seek N2X). Isocore says it selected N2X for its skill to simulate, scale, and make measurements for the magnitude of subscribers and repair site visitors required to emulate mass deployment situations.
"before carrier suppliers deploy IPTV and different multi-play capabilities, they want the self assurance that their network can deliver those services at scale and with the fine their customers are expecting," explains Rod Unverrich, enterprise supervisor of Agilent's information Networks Operation. "N2X permits NEMs and service suppliers to charge-conveniently simulate the size and complexity of precise-world multi-play deployments and validate that their community architectures can meet strict performance, reliability, and QoS requirements."[Native Advertisement]
"The scalability and usefulness of the Agilent N2X turned into pivotal in evaluating the efficiency of the Alcatel-Lucent Triple Play provider beginning architecture," adds Dr. Bijan Jabbari, president of Isocore. "We wanted this to be the trade's most comprehensive and valid assessment of a working triple-play network. N2X fitted us with the capability to without delay emulate a very giant number of triple-play subscribers with distinct profiles and generate multi-type traffic to create a extremely functional check environment."
Agilent says its N2X look at various measurements verify that the Alcatel-Lucent TPSDA carried out very neatly below extreme scaling circumstances. site visitors forwarding measurements that have been run repetitively and overnight demonstrated minimal latency and low packet loss. Media delivery Index video nice metrics have been used to validate that fine of event expectations have been met on a per-subscriber basis. the entire Isocore examine report, together with test parameters, is obtainable here.
in accordance with Agilent, the N2X helps NEMs and service suppliers increase the time to market and exceptional of triple-play provider deployments with the aid of:
seek advice from Agilent applied sciences
be trained extra about the test and measurement business at Lightwave's look at various & measurement useful resource core.
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ARP support, Access Control List (ACL) support, Dynamic VLAN Support (GVRP), GRE tunneling, IGMP snooping, IPv6 support, LDAP support, LLDP support, Link Aggregation Control Protocol (LACP), MLD snooping, Management Information Base (MIB), Multicast Storm Control, Alcatel-Lucent Mapping Adjacency Protocol (AMAP), Multiple Spanning Tree Protocol (MSTP) support, NTP time synchronization, Neighbor Discovery Protocol (NDP), Network Access Control (NAC), Per-VLAN Spanning Tree (PVST), Quality of Service (QoS), RADIUS support, RARP support, Rapid Spanning Tree Protocol (RSTP) support, Remote Desktop Protocol (RDP) support, BOOTP support, Ring Rapid Spanning Tree Protocol (RRSTP), SNMP trap, STP Root Guard, Spanning Tree Protocol (STP) support, Strict Priority Queuing (SPQ), Syslog support, Trivial File Transfer Protocol (TFTP) support, Uni-Directional Link Detection (UDLD), VLAN support, Virtual Chassis technology, Broadcast Storm Control, Weighted Round Robin (WRR) queuing, anti-spoofing protection, auto-negotiation, auto-sensing per device, auto-uplink (auto MDI/MDI-X), dynamic ARP protection, event log, fanless, flow control, full duplex capability, DHCP client, layer 2 switching, layer 3 switching, port mirroring, sFlow, static routing, tunneling, DHCP relay, DHCP snooping, Deficit Weighted Round Robin (DWRR), DiffServ support
IEEE 802.1D, IEEE 802.1Q, IEEE 802.3ab, IEEE 802.3ac, IEEE 802.3ad (LACP), IEEE 802.3ah, IEEE 802.3i, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z, IEEE 802.1ab (LLDP), IEEE 802.1ad, IEEE 802.1ag, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3
Tests Demonstrate Packet-Based Backhaul Networks Can Satisfy Synchronization Requirements Under Real-World Conditions
CALABASAS, CA--(Marketwire - Feb 16, 2012) - Ixia (NASDAQ: XXIA), the leading global provider of converged IP and wireless network test solutions, today announced it participated in a test of mobile backhaul packet synchronization with Alcatel-Lucent. The demonstration highlighted that the Alcatel-Lucent Mobile Backhaul Solution can maintain accurate phase synchronization and quality of service (QoS) guarantees, while undergoing test conditions related to extreme packet congestion and network failovers. For further information about this test visit Ixia's booth (Hall 1, 1E47) and Alcatel-Lucent's booth (Hall 6, 6C23) at Mobile World Congress 2012 in Barcelona, Spain from February 27 - March 1.
Reliable distribution of packet synchronization is critical to the operation of advanced mobile broadband communications: it is required to ensure seamless mobility and enable new services such as those that leverage the LTE Multimedia Broadcast Multicast Services (MBMS) capabilities. One of the most demanding packet synchronization environments is one that addresses the phase synchronization requirements for LTE TDD and LTE MBMS over a backhaul network consisting of microwave links.
Carriers are replacing legacy TDM-based mobile backhaul networks with IP/Ethernet-based solutions in order to cost-effectively scale their networks and accommodate bandwidth-hungry mobile devices. Accurate timing synchronization across the network is critical for the successful operation of mobile networks. Network devices are implementing IEEE 1588v2 to achieve accurate clock synchronization for both frequency and phase (time of day), but 1588v2 implementations can become strained in large network environments that include many slave clocks synchronizing to a master clock. Timing synchronization and service delivery can also be compromised during network failover and recovery. It is important to test both the scalability of 1588v2 implementations, as well as the speed of clock alignment following network failure, to ensure the stability of network services and SLA compliance.
Verifying the reliability and accuracy of a 1588v2 clock implementation requires repeatable testing under real-world network conditions over long test intervals. Ixia tested Alcatel-Lucent's Mobile Backhaul Solution using its IxNetwork application with full IEEE 1588v2 protocol emulation. The demonstration reflects a typical multi-device backhaul deployment -- from network access through aggregation, including the 7705 Service Aggregation Router, 7210 Service Access Switches, 9500 Microwave Packet Radio, and 7750 Service Router. Test Composer, integrated within Ixia's IxNetwork application, tightly managed and automated all test sequences and events -- including traffic generation, slave clock emulation, link failures, and clock measurements. IxNetwork's Macro Recorder made it easy to record and translate user GUI actions into Test Composer commands. These two recent IxNetwork features helped ensure test results were repeatable and reliable over multiple iterations.
About Ixia Ixia provides the industry's most comprehensive converged IP services testing solution -- from the wireless edge to the Internet core. Network equipment manufacturers, service providers, enterprises, and government agencies use Ixia's industry-leading test and simulation platforms to design and validate a broad range of wired, Wi-Fi, and 3G/4G networking equipment and networks. Ixia's solutions create real-world conditions by emulating a full range of high-scaling networking protocols and generating media-rich application traffic to validate performance, conformance and security of cloud, core, data center, wireless and multiplay networks. For more information, visit www.ixiacom.com.
Ixia and the Ixia four-petal logo are registered trademarks or trademarks of Ixia. Other trademarks are the property of their respective owners.
Once upon a time, layer-2 unicast performance tests would have produced by far the most important results, but that's changed. Measuring unicast throughput on all ports, once considered the acid test for access switches, is no longer a major differentiator.
Even in the most stressful test case – with a Spirent TestCenter traffic generator blasting minimum-length 64-byte frames at all switch ports – throughput was at or very close to line rate for all switches except D-Link's 3650.
We observed similar results when measuring throughput for 256- and 1,518-byte frames as well, both in layer-2 (switched) and layer-3 (IP forwarded) configurations. Throughput just isn't the differentiator it once was.
After we completed testing, D-Link objected to our methodology, complaining that it isn't indicative of real-world conditions. We take D-Link's point, and hope no network manager would consider running a production network at 99% utilization or above. But we've heard this complaint before many times, and believe it misses the point. No one ever represented that industry-standard throughput testing practices use "real-world" traffic patterns (never mind that "reality" differs vastly from network to network). Rather, the goal is to determine the limits of switch performance.Multicast group capacity
If unicast performance didn't differentiate products, multicast performance certainly did. We assessed multicast by measuring group capacity, and layer-2 and layer-3 multicast throughput and latency. Multicast group counts turned out to be major differentiators, not just in the capacity tests but also in the throughput and latency tests.
The goal of the group capacity tests was to determine the maximum number IGMPv3 multicast groups each switch could handle. This is a key measure of multicast scalability: The more groups a switch can track, the more users can do with multicast.
Since this is an access switch test, we configured each device in layer 2-only mode and enabled IGMP snooping. Then we configured the Spirent TestCenter traffic generator/analyzer to join some number of groups, and measured whether the switch would forward traffic to all groups without flooding (see "Breaking the standards").
The results reveal lots of variation among products, with group capacity ranging from nearly 1,500 for HP's ProCurve to less than 70 for Dell's PowerConnect. For enterprises that only need 70 or fewer multicast groups in the enterprise for the life of the switch, this isn't an important distinction; for everyone else – and that certainly will cover most midsize and large enterprises, and many small ones as well – group counts do matter.
The capacity test focused only on maximum group count. When it came to measuring throughput and latency, the group counts supported by each switch were lower in some cases than other.
In part the difference is explained by switch configurations. We measured layer-2 throughput and latency using more or less the same topology as in the group capacity tests. In the layer-3 tests we enabled protocol-independent multicast (PIM), a multicast routing protocol, essentially putting a router on every port. Just judging from the supported group counts where less than half the switches hit the 500 group count mark, this is far more stressful on the device under test.
Not shown in the chart is the fact that it took multiple software builds for some vendors to obtain these results. Our initial multicast tests of the Alcatel-Lucent, Dell, D-Link and Foundry switches with 500 groups led to lockups or reboots. All these vendors supplied software updates that led to more stable switches. However, as the results show, not all could be tested with 500 groups. If a switch could not hit the 500 group mark we'd outlined for throughput and latency testing, we tested layer-2 and layer-3 multicast throughput and latency at the switch's maximum group capacity.
HP's ProCurve did support 500 groups, but with a twist: In L3 testing, it could use only two virtual LANs, IP subnets and PIM router instances, compared with 49 on all other devices. Clearly this limitation would rule out the use of this ProCurve switch in situations where more than two subnets and multicast routing instances are needed.
Several vendors observed that few customers today support 500 multicast groups at the edges of their networks. But we can argue that conditions may be changing. In some industries, notably financial services, it's already common to support dozens to hundreds of multicast group subscriptions for stock-quote applications.
Multicast scalability may not be a top priority in choosing network devices yet, but it's likely to become more important.Switch jitters
Latency, or the length of time a switch buffers each frame, is also a key switch metric, more important than throughput for real-time applications such as voice and video. In fact, multicast throughput turned out to be a nonissue in our tests, with all products moving packets within 0.5% of line rate.
For unicast traffic, differences between products handling midsize frames were relatively minor, but average and maximum unicast latencies differed widely when switches handled minimum- and maximum-length frames (see Unicast Latency chart). In particular, Foundry's X448 exhibited unusually high average and maximum delays when handling large frames. The vendor says it hasn't seen this result in other tests, but it was very repeatable in our lab.
Multicast latencies varied much more, with a 500-fold difference between the lowest result and the highest – both from HP's ProCurve switch (see Multicast Latency chart). A big delta between average and maximum latency may indicate an issue with jitter, or latency variation, which can have an adverse effect on delay-sensitive applications such as voice and video. The HP and Alcatel-Lucent switches exhibit much greater variation than other switches between average and maximum multicast latency, with spreads of hundreds or thousands of microseconds. In contrast, all other switches held up traffic at most 1 to 4 microsec.
The Alcatel-Lucent and HP switches also exhibited much higher latency for multicast than unicast. Conversely, Foundry's X448 did far better with large-frame latency when handling multicast traffic. The traffic topologies differed in the unicast and multicast tests, making the comparison a bit unfair, but given that switches move unicast and multicast alike in silicon we were surprised to see any differences.
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