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ERSPAN Installation: Difference between revisions
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=== How should the '''ERSPAN''' mode be used? === | === How should the '''ERSPAN''' mode be used? === | ||
'''ERSPAN''' quality depends on the Switch performance and the bandwidth and latency between the Switch and the Allegro. It will also add substantial load to the IP networks and can generate a packet storm when the ERSPAN packets are mirrored again into the ERSPAN tunnel. | '''ERSPAN''' quality depends on the Switch performance and the bandwidth and latency between the Switch and the Allegro Network Multimeter. It will also add substantial load to the IP networks and can generate a packet storm when the ERSPAN packets are mirrored again into the ERSPAN tunnel. | ||
See [[#Limitations]] for more details. | See [[#Limitations]] for more details. | ||
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The Allegro Network Multimeter allows you to send '''ERSPAN''' packets via the management interface over a switched and routed network like a pcap capture. Allegro recommend you use the '''ERSPAN''' sending feature only via the LAN interface and not with the Wi-Fi interface. Please see [#Limitations] for more details. | The Allegro Network Multimeter allows you to send '''ERSPAN''' packets via the management interface over a switched and routed network like a pcap capture. Allegro recommend you use the '''ERSPAN''' sending feature only via the LAN interface and not with the Wi-Fi interface. Please see [#Limitations] for more details. | ||
Please make sure that the sending Allegro MTU size is big enough to send the whole packet including the '''ERSPAN''' header. To configure the Allegro as an '''ERSPAN''' sender, increase the MTU size on the management interface AND on all Switches between the sending and receiving Allegro. This can be done at '''Settings''' → '''Management settings''' → '''LAN management interface'''. | Please make sure that the sending Allegro MTU size is big enough to send the whole packet including the '''ERSPAN''' header. To configure the Allegro Network Multimeter as an '''ERSPAN''' sender, increase the MTU size on the management interface AND on all Switches between the sending and receiving Allegro Network Multimeter. This can be done at '''Settings''' → '''Management settings''' → '''LAN management interface'''. | ||
[[File:Lan mtu settings.png|900px]] | [[File:Lan mtu settings.png|900px]] | ||
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[[File:Erspan capture dialog.png|400px]] | [[File:Erspan capture dialog.png|400px]] | ||
This can be done also using Back-In-Time. Please use the real-time replay with factor 1.0 to replay with the same packet timing for the receiving Allegro. See [#Limitations] for more details. | This can be done also using Back-In-Time. Please use the real-time replay with factor 1.0 to replay with the same packet timing for the receiving Allegro Network Multimeter. See [#Limitations] for more details. | ||
== Limitations == | == Limitations == | ||
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=== Fragmentation === | === Fragmentation === | ||
ERSPAN is supported for non-fragmented ERSPAN packets. Please make sure that the link between the Switch and the Allegro supports a higher MTU than the monitored link. We recommend to use jumbo frames with 9000 bytes to forward packets. | ERSPAN is supported for non-fragmented ERSPAN packets. Please make sure that the link between the Switch and the Allegro Network Multimeter supports a higher MTU than the monitored link. We recommend to use jumbo frames with 9000 bytes to forward packets. | ||
=== Timestamping === | === Timestamping === | ||