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In-Line Installation: Difference between revisions
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=== DISCLAIMER === | === DISCLAIMER === | ||
Allegro recommends a separate Tap, a Packet Broker or | Allegro recommends a separate Tap, a Packet Broker or Mirror Port for productive network links. Please use the '''In-Line''' only if the failure of a link does '''not''' cause problems. | ||
=== What is the '''In-Line''' mode? === | === What is the '''In-Line''' mode? === | ||
The '''In-Line | The '''In-Line mode''' allows the Allegro to work as a transparent Bridge. Pairs of network ports form a group where all received traffic is forwarded immediately to the other port of the pair. It is the default configuration of the Allegro Network Multimeter that 2 port pairs build a transparent Bridge. | ||
=== How should the '''In-Line | === How should the '''In-Line mode''' be used? === | ||
The Allegro can be installed between 2 network devices. As an example, the Allegro can be installed between a Switch and an Access Point. | The Allegro can be installed between 2 network devices. As an example, the Allegro can be installed between a Switch and an Access Point. | ||
The '''In-Line | The '''In-Line mode''' is designed for links where the downtime of a link is '''not''' critical and where a delay and jitter of a few microseconds is acceptable. See [[#Limitations]] for more details. | ||
=== | === How do I configure the '''In-Line mode?''' === | ||
The '''In-Line | The '''In-Line mode''' can be configured at '''Settings''' → '''Global settings''' → '''Packet processing mode'''. The interfaces can be configured to '''Bridge mode''' or '''Sink mode'''. The '''Bridge mode''' will enable packet forwarding to the Ethernet pair ports. | ||
[[File:Bridge mode.png|800px]] | [[File:Bridge mode.png|800px]] | ||
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=== Devices with built-in network ports === | === Devices with built-in network ports === | ||
The '''Allegro 200, 500, 1000, 1200, 3000 and 3200''' have built-in physical network ports which run by default in '''Bridge | The '''Allegro 200, 500, 1000, 1200, 3000 and 3200''' have built-in physical network ports which run by default in '''Bridge mode'''. | ||
{| class="wikitable" | {| class="wikitable" | ||
|Device||Picture||Monitoring Ports||Bridge Pairs||Pair Description | |Device||Picture||Monitoring Ports||Bridge Pairs||Pair Description | ||
|- | |- | ||
|'''Allegro 200'''||[[File:Allegro-200 back cut.jpg|400px]]||2||1||Ports 1 and 2 establish one | |'''Allegro 200'''||[[File:Allegro-200 back cut.jpg|400px]]||2||1||Ports 1 and 2 establish one Bridge for the '''In-Line mode'''. | ||
|- | |- | ||
|'''Allegro 500'''||[[File:Allegro-500 back cut.jpg|400px]]<br/>[[File:Allegro-500 front cut.jpg|400px]]||4||2||Port pairs '''1,2''' and '''3,4''' establish two | |'''Allegro 500'''||[[File:Allegro-500 back cut.jpg|400px]]<br/>[[File:Allegro-500 front cut.jpg|400px]]||4||2||Port pairs '''1,2''' and '''3,4''' establish two Bridges for the '''In-Line mode'''. | ||
|- | |- | ||
|'''Allegro 1000'''<br/>'''Allegro 3000'''||[[File:Allegro-1000 front cut.jpg|400px]]||7||3||Port pairs '''2,3''', '''4,5''' and '''6,7''' establish in total 3 | |'''Allegro 1000'''<br/>'''Allegro 3000'''||[[File:Allegro-1000 front cut.jpg|400px]]||7||3||Port pairs '''2,3''', '''4,5''' and '''6,7''' establish in total 3 Bridges for the '''In-Line mode'''. The pair are the upper and lower Ethernet ports. Port '''1''' will receive traffic in '''Sink mode''' since there is no corresponding Bridge port. | ||
|- | |- | ||
|'''Allegro 1200'''<br/>'''Allegro 3200'''||[[File:Allegro-1200-front cut.jpg|400px]]||7||3||Port pairs '''2,3''', '''4,5''' and '''6,7''' establish in total 3 | |'''Allegro 1200'''<br/>'''Allegro 3200'''||[[File:Allegro-1200-front cut.jpg|400px]]||7||3||Port pairs '''2,3''', '''4,5''' and '''6,7''' establish in total 3 Bridges for the '''In-Line mode'''. The pair are the upper and lower Ethernet ports. Port '''1''' will receive traffic in '''Sink mode''' since there is no corresponding Bridge port. | ||
|- | |- | ||
|'''Allegro x300'''<br/>'''Allegro x500'''||||none||none||The Allegro x300 and x500 series do not have built-in network ports; see section [[#Devices with port expansion cards| expansion cards]] below. | |'''Allegro x300'''<br/>'''Allegro x500'''||||none||none||The Allegro x300 and x500 series do not have built-in network ports; see section [[#Devices with port expansion cards| expansion cards]] below. | ||
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=== Devices with port expansion cards === | === Devices with port expansion cards === | ||
All Allegros with network card expansion slots support the '''In-Line | All Allegros with network card expansion slots support the '''In-Line mode''' by default. All expansion cards have either '''2''' or '''4''' network ports. Each card forms '''1''' or '''2''' Bridges. On expansion cards with '''4''' ports, the two left and the two right ports are the Bridge pairs. | ||
=== Bypass expansion cards === | === Bypass expansion cards === | ||
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 bypass cards for the Allegro Network Multimeter deliver a fail-over when the software bypass is not active. The bypass will be enabled when Bridge mode is active, when the Allegro firmware is not running due to power off, firmware upgrade process or most situations of software or hardware failure. | ||
=== PoE expansion cards === | === PoE expansion cards === | ||
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== Limitations == | == Limitations == | ||
=== Link | === Link setup === | ||
The Allegro negotiates every port of a | The Allegro negotiates every port of a Bridge pair independently. This can lead to a link speed mismatch. As an example, an installation between a 1GBit/s switch port and a 100 MBit/s VoIP telephone will lead by default to a speed mismatch. The Allegro will show a warning if there is a speed mismatch. | ||
You can check if there is a mismatch at '''Interface | You can check if there is a mismatch at '''Interface stats'''. | ||
[[File:Interface speed mismatch.png|200px]] | [[File:Interface speed mismatch.png|200px]] | ||
=== Delay and | === Delay and jitter === | ||
Traffic forwarding is handled in software. This incurs a minor delay and jitter. The average delay and jitter is below 1 microsecond and does not have a measurable impact on most networks. The worst case jitter is below 50 microseconds. You can check average and worst case jitter at '''System | Traffic forwarding is handled in software. This incurs a minor delay and jitter. The average delay and jitter is below 1 microsecond and does not have a measurable impact on most networks. The worst case jitter is below 50 microseconds. You can check average and worst case jitter at '''System info''' → '''Info''' → '''Load'''. | ||
[[File:Loop duration.png|600px]] | [[File:Loop duration.png|600px]] | ||
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=== Performance limitations === | === Performance limitations === | ||
The software bypass can forward several million packets per second | The software bypass can forward several million packets per second depending on the Allegro model. If packet loss on the bridge is not accepable for multi-million packets per second, please use a Tap or similar. | ||