LANAUDIO

Troubleshooting LANAUDIO (AES67 / Livewire)

"Nothing received" :

- UDP port ?

- IGMP snooping enable on Ethernet Switches (on whole IP path).

- There must be at least one switch that acts as an IGMP Master (Querier).

- if VLAN used :

• is same VLAN ?
• Check that there is one IGMP Master (Querier) dedicated to this VLAN.

Clocking problem

(audio clics and many "samples added/removed/overrun" in logs) :

- Check Synchro Reference Clock

- Check Synchro Status : must be stable "LOCKED"

- if VLAN used : is same VLAN for clock ?

- Switch QOS / priority queues

- Switch IGMP snooping enable

- If SOUND4 is always Clock Master, better configure "Ref Clock internal" to use the clean low drift quartz (if not, may be too far from true 27MHz, and sync may not be possible)

Latency Problem

(audio clics and few "samples added/removed/overrun" in logs) :

- Switch QOS

- increase Buffer in Profile

Audio Packet Loss

- Check Audio Channel Status : must be stable "Stream OK"

- Switch QOS

- Switch IGMP snooping enable : board should not receive other audio streams than the ones configured. Check AES67/LIVEWIRE logs for "Dropped packets" with the faulty IP in hexa.

Packet / Link Overflow

Diagnose with "Ethernet Logs" that show plenty "Dropped packets <source HEX IP ADDRESS>-><dest HEX IP ADDRESS>". The IP source and multicast dest address are in hexa, eg C0A8051C->EFC00123 means 192.168.5.28->239.192.255.1.35

This usually happens when the Ethernet Switch is not filtering the unregistered Multicast packets. In this case the Ethernet link may be saturated and the switch may also drop packets which can cause audio clics. Check that IGMP is well configured on the Ethernet switch.

If the dest address is a wanted address, it may be a misconfigured UDP port.

If the dest address is a Livewire Clock address (EFC0FF01=239.192.255.1 or EFC0FF02=239.192.255.2), it's also probably a misconfigured UDP port.

Tools

RAV2SAP

Translate Ravenna mDNS <=> Dante SAP

May be used to diagnose advertisement problems (SDP SAP)

https://www.ravenna-network.com/aes67/rav2sap/

EBU LIST (Live IP Software Toolkit)

The Live IP Software Toolkit is a suite of software tools that help to inspect, measure and visualize the state of IP-based networks and the high-bitrate media traffic they carry.

It allows the user to:

• evaluate the utilization of a given network
• measure the impact of new equipment connected to the network
• pinpoint problems in an IP-based live production facilityLIST can decode network streams and can be used to inspect basic and deep level network properties.

https://tech.ebu.ch/list

MEINBERG PTP Track Hound

Tool to diagnose (record, visualize and analyze) PTP IEE1588 clock network traffic

Features :

• Records PTP traffic and visualizes received messages
• Automatically decodes PTP specific message data and TLVs
• Detects PTP capable devices and displays them in a clearly arranged tree view
• Discovers and conveys Master changes and configuration issues

https://www.meinbergglobal.com/english/sw/ptp-track-hound.htm