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The bypass cards for the Allegro Network Multimeter deliver a fail-over when the software bypass is not active. The bypass will be enabled when the bridge mode is active when the Allegro Firmware is not running due power off, firmware upgrade process or most situations of software or hardware failure. | The bypass cards for the Allegro Network Multimeter deliver a fail-over when the software bypass is not active. The bypass will be enabled when the bridge mode is active when the Allegro Firmware is not running due power off, firmware upgrade process or most situations of software or hardware failure. | ||
=== PoE extension cards === | |||
Power over Ethernet bypass is not supported by the Allegro. A PoE extension card can be installed to support PoE. The usage of a PoE injector is recommended if PoE is required. | |||
== Limitations == | == Limitations == | ||
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[[File:Interface speed mismatch.png|200px]] | [[File:Interface speed mismatch.png|200px]] | ||
=== | === Delay and Jitter === | ||
The traffic forwarding is done in software. This implies a delay and jitter. The average delay and jitter is below 1 microsecond and does not have ameasurable impact on most networks. The worst case jitter is below 50 microseconds. You can check your average and worst cast jitter at '''System Info''' → '''Info''' → '''Load'''. | The traffic forwarding is done in software. This implies a delay and jitter. The average delay and jitter is below 1 microsecond and does not have ameasurable impact on most networks. The worst case jitter is below 50 microseconds. You can check your average and worst cast jitter at '''System Info''' → '''Info''' → '''Load'''. | ||
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[[File:Loop duration.png|600px]] | [[File:Loop duration.png|600px]] | ||
=== | === Packet limitations === | ||
The software bypass does '''NOT'' forward : | |||
* Packets with an MTU above 9000 bytes | |||
* FcoE ( Fibre Channel over Ethernet ) packets ( ethertype 0x8906 ) | |||
* Ethernet flow control and pause frames ( ethertype 0x8808 ) | |||
=== Performance limitations === | |||
The software bypass can forward several million packets per second, depending on the Allegro. If a packet loss on the bridge is not accepable for multi-million packets per second, please use a tap or similar. | |||