Arista Multicast DNS Gateway (EOS-4.26 ++)
Description
A mDNS Gateway extends the link-local scope of mDNS messages to additional subnets
to provide service discovery and domain name resolution over an extended link-local
multicast domain. A mDNS gateway can also peer with additional mDNS gateways to
extend the logical link-local multicast domain to include directly connected subnets on a
mDNS gateway peer. To manage services in the extended link-local multicast domain, a
gateway also specifies service rule policies that can:
- filter on interested service types;
- control the discoverable subnets for a given client subnet; and,
- limit the discoverable services based on the geographical location of the client.
The mDNS gateway respects the link-local scope of mDNS messages and does not
propagate mDNS traffic between subnets when building extended link-local multicast
domain. Each mDNS gateway will snoop mDNS announcements and proxy mDNS queries based on the learned results. When a logical link-local multicast domain stretches
multiple gateways a mDNS query will be forwarded to a mDNS gateway peer to query
mDNS announcements learned on the peer.