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#CISCO MAC ADDRESS TABLE MAXED OUT SOFTWARE#
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In comparison, the average consumption across seven other 10G Ethernet access switches were 150 and 174 watts for idle and full loads, respectively.

Using a Fluke 335 clamp meter, the Juniper switch consumed 185 watts when idle and 199 watts when its control and data planes were fully loaded. In what's become a regular part of device testing, we also measured the EX 4200's power consumption, when idle and when maxed out. Still, given Juniper's rapid response on the duplication issue and its ongoing multicast development, we don't consider any of these bugs to be showstoppers. With interest growing in multicast, especially in certain vertical industries such as financial services, these misadventures may pose a cause for concern.

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We verified that the new software eliminated duplication. Juniper quickly issued a new software build (already available to customers at press time) that corrected a problem when the switch ran in standalone rather than stackable mode. Third, in initial testing the switch created duplicate copies of some multicast traffic, rendering results invalid. This latter feature is helpful in situations where transmitters or receivers in different groups share common switch ports. Chief among these are source filtering and the ability to monitor group states based on source plus group address. As described in RFC 3376, Appendix B, IGMPv3 offers numerous improvements over IGMPv2. The Juniper software version we tested supported IGMPv2, though the vendor says it's working to add IGMPv3 support later this year. Second, we tested other switches using IGMPv3, the current version of that protocol. And in any event, a switch should never spontaneously reboot, no matter how burdensome the load. But the others were over their multicast group counts limits at the time, while the 500 groups used in this test should have been no problem for the Juniper switch. Granted, these were stress tests, and Juniper's system certainly isn't the first we've caused to reboot while running multicast benchmarks. First and most seriously, the switch spontaneously rebooted once during layer-3 multicast tests. The EX 4200 moved traffic to 1,001 IGMPv2 groups - around 500 less than the leader of the previous tests, the HP ProCurve 3500yl, but still good enough to rank the Juniper switch second in multicast group capacity among access switches we've tested this year.Д«ut multicast testing also revealed some rough spots. The switch fared well in a test of multicast group capacity - the maximum number of IGMP groups the device can concurrently support.

#CISCO MAC ADDRESS TABLE MAXED OUT CODE#

While the EX 4200 put up stellar numbers in the throughput and latency benchmarks, testing also made clear that its multicast code is newer and less robust than other parts of the system.ДЇirst the good news. The Juniper switch won't hold up traffic long enough to adversely affect the performance of any enterprise application.

Multicast latency also hovered in the low microseconds, compared with numbers that in some cases were dozens of times higher in previous tests. The gigabit numbers are either comparable to or better than most other switches we've tested the 10G Ethernet latencies, again, set record lows. With large 1,518-byte frames, latencies hovered in the 2 to 3 microsec range on 10G Ethernet ports and in the 20 to 30 microsec range on gigabit Ethernet ports. In fact, even the maximum latency of the EX 4200 is less than the lowest average result we measured in the previous round of tests. Those are the lowest latencies we've ever recorded in an Ethernet switch. Measured at line rate, the Juniper switch delayed 64-byte frames across 10G Ethernet links for an average of 1.96 microsec and a maximum of 2.01 microsec. Latency - often a more important metric than throughput, especially for time-sensitive voice and video traffic - was low and consistent across all tests.

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Even under the heaviest loads our Spirent TestCenter traffic generator threw at it, the switch delivered line-rate throughput in every single unicast and multicast test, both in layer-2 and layer-3 configurations. With Juniper's EX 4200, there's no need to say 'nearly'.

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