There are some considerations to be taken in account when running Dante over a Cisco SDA Network.
Depending on the fabric mode used on the VLAN where Dante devices will be connected, the following scenarios can apply:
- Layer 2 Flooding enabled
- Multicast traffic will just flow trough: Discovery (mDNS) and Clocking (PTP)
- There’s a Cisco bug (Bug Search Tool) where any PTP address other that 224.0.1.129 will be blocked
- That's not a problem with unmanaged Dante (PTPv1 or PTPv2)
- Under DDM:
- It will be a problem for PTPv1 as the default IP address will change (PTP IP addresses used by Dante | Dante). This can be workaround to force the PTPv1 address back to .129 by enabling PTPv2 mode and setting PTPv2 Domain 0.
- PTPv2 will be OK
- Layer 3 Overlay:
- Dante PTPv1 has TTL=1 which will not pass across the different switches.
- This can be worked around by:
- Enabling Unicast clocking in at least one device per switch - requires DDM
- By enabling PTPv2 on the network and Dante devices and having at least 1 Dante device with PTPv2 support on the switches with Dante Devices that only support PTPv1. More here: Dante Devices PTP Clocking Support | Dante
- Audio Multicast (Dante or RTP [AES67/ST2110]) uses TTL=32