Network Switch Selection for AV

The switch is the foundation of any networked AV system. Choosing the wrong switch — or using consumer hardware in a professional installation — is one of the most common causes of intermittent audio dropouts, video tearing, and system instability. This note covers what to look for when specifying switches for AV use.

Managed vs. Unmanaged Switches

Unmanaged switches are plug-and-play devices with no configuration interface. They handle basic Layer 2 forwarding but cannot support VLANs, IGMP snooping, QoS, or port monitoring. They are not suitable for any installation carrying Dante, AES67, AV-over-IP, or other time-sensitive multicast protocols.

Managed switches provide full configuration access via a web GUI, CLI, or SNMP. They support:

• VLANs (802.1Q) for traffic isolation
• IGMP snooping for multicast management
• QoS (802.1p/DSCP) for traffic prioritization
• Spanning Tree Protocol (STP/RSTP) for loop prevention
• Port mirroring for traffic analysis
• SNMP monitoring and alerts

Always specify managed switches for professional AV installations. The cost difference is justified by the control and reliability they provide.

Smart/Web-managed switches sit between unmanaged and fully managed. They support basic VLAN and IGMP snooping configuration but often lack CLI access and advanced QoS features. They may be acceptable for very small systems but are not recommended for installations with Dante, AES67, or high-density video-over-IP.

Key Features for AV Networks

IGMP Snooping

Required for any installation using Dante, AES67, NDI, or AV-over-IP. The switch must support IGMP snooping per-VLAN and include an IGMP querier function. Verify the switch can handle the number of multicast groups your system will generate. Dante alone can create hundreds of multicast flows in large systems.

Also check for MLD snooping support (the IPv6 equivalent of IGMP snooping) if devices on the network have IPv6 enabled.

QoS (Quality of Service)

AV traffic requires priority handling over general data traffic. Look for switches that support both 802.1p (Layer 2 CoS) and DSCP (Layer 3 differentiated services) marking and queuing. The switch should have at least 4 egress queues per port, ideally 8.

Dante requires its traffic be prioritized at DSCP 46 (EF — Expedited Forwarding) for audio and DSCP 34 (AF41) for control. Audinate's Switch Configuration Guide (available at audinate.com) specifies recommended QoS settings for each major switch vendor — consult it when commissioning.

Low Latency

Switches add a small but measurable delay to every packet. For live AV applications, this matters. Enterprise-grade switches typically add 2–10 µs per hop for unicast traffic. Avoid switches with software-based forwarding engines (common in consumer and SMB gear) — these can add milliseconds of unpredictable delay.

Port Density and Speed

• 1 Gbps access ports — standard for most AV endpoints (Dante devices, IP cameras, control processors)
• 10 Gbps uplinks — recommended for aggregation and core switches carrying many AV flows
• 10 Gbps access ports — may be required for high-density Dante (>256 channels) or high-bandwidth video-over-IP (SMPTE 2110, NVX with multiple 4K encoders)
• 2.5G / 5G multi-gig — useful for high-bandwidth edge devices that don't yet need a full 10G port

Stacking and Uplinks

For larger systems, stackable switches allow multiple units to behave as one logical switch, simplifying management and providing high-bandwidth backplanes. Multi-gigabit uplinks (10G or 25G) prevent uplink congestion when aggregating many AV flows.

Power over Ethernet (PoE)

PoE allows network cables to carry DC power to connected devices, eliminating the need for separate power supplies at each endpoint. For AV installations, PoE simplifies cabling for PTZ cameras, IP intercoms, IP speakers, wireless access points, and control panels.

When specifying a PoE switch, check both per-port wattage and total switch PoE budget. See poe-power-over-ethernet for full budget calculation guidance.

Recommended Switch Models by Use Case

The right switch depends on the size and nature of the installation. These are commonly used models in current AV practice:

Small meeting room (< 10 AV endpoints, basic Dante):

• Netgear M4250-8G2XF-PoE+ (8-port 1G PoE+, 2x SFP+) — Audinate-certified configuration available
• Cisco CBS350-8P-2G — compact managed PoE+ switch with IGMP snooping

Medium installation (20–50 AV endpoints, Dante + video-over-IP):

• Netgear M4250-26G4F-PoE+ — 26-port 1G PoE+, 4x SFP; common in AV installs
• Cisco Catalyst 2960-X or 2960-CX series — well-documented Dante configurations
• HP Aruba 2530 or 2930 series — common in enterprise environments

Large installation (50+ endpoints, 10G uplinks, NVX/SMPTE 2110):

• Cisco Catalyst 9200 / 9300 series — enterprise-grade, 10G uplinks, robust IGMP/QoS
• Extreme Networks X435 / X440-G2 — strong in live events and broadcast
• Netgear M4300 series — 10G stackable, good value for larger AV deployments

Harsh/industrial environments (manufacturing, outdoor, permanent install):

• Belden/Hirschmann GECKO, SPIDER series — DIN-rail mounted, wide temperature range
• Cisco IE 1000 / IE 3400 — industrial Ethernet rated for extended environments

Spanning Tree Protocol

STP/RSTP prevents Layer 2 loops. Always enable RSTP on managed switches in AV installations.

Configure PortFast (Edge Port) on access ports connecting to AV end devices. This skips the STP listening and learning phases, allowing devices to connect immediately instead of waiting 30 seconds.

Enable BPDU Guard on PortFast ports to protect against accidental switch-to-switch connections on access ports.

See spanning-tree-protocol for detailed configuration guidance.

Audinate Switch Configuration Guide

Audinate (makers of Dante) publishes a free Switch Configuration Guide listing specific settings for Cisco, Netgear, HP, Extreme, and other major vendors. The guide covers:

• IGMP snooping enable commands per vendor
• IGMP querier configuration
• QoS/DSCP marking for Dante audio and control
• VLAN configuration examples
• PortFast/BPDU Guard settings

Download from audinate.com/learn/networking-resources. Reference this guide before commissioning any Dante system — the settings have been validated by Audinate's technical team and represent best practice for each platform.

Common Pitfalls

• Using unmanaged switches for Dante or AES67 — Without IGMP snooping, multicast floods all ports. Audio dropouts, excessive switch CPU load, and interference with other network devices are the result. Even a single unmanaged switch in the chain can cause problems.
• Undersizing PoE budget — Calculating only per-port wattage without checking total switch budget leads to devices that don't power up or randomly reboot. Always sum all PoE loads and add 20% headroom.
• Not enabling PortFast on access ports — AV devices connecting to ports without PortFast wait 30+ seconds for STP to converge. Dante Controller shows devices as appearing and disappearing. This is one of the most common commissioning problems.
• Mixing 1G and 10G links without traffic planning — A 10G uplink carrying multiple 1G Dante flows from access ports can still be saturated. Plan uplink capacity based on actual multicast and unicast load, not just port speed.
• Consumer-grade "gaming" switches — Marketing claims of "low latency" and "QoS" don't translate to the deterministic, configurable QoS required for AV. Always use enterprise-class managed hardware.
• Not verifying IGMP snooping is active per-VLAN — Many switches require IGMP snooping to be enabled both globally AND per-VLAN. Enabling it globally without per-VLAN activation leaves IGMP snooping inactive. Verify with show ip igmp snooping after configuration.