Alcatel-Lucent AOS-W 6.5.3.x - Mdns Multicast Response Propagation

1033| AirGroup AOS-W 6.5.3.x| User Guide
Disable AirGroup using WebUI
To disable AirGroup using the switch WebUI:
1. Navigate to Configuration > Advanced Services > AirGroup.
2. Select Settings tab.
3. Under Global Setting > AirGroup Status, select Disabled from the drop-down list.
4. Click Apply.
Disable mDNS APVLANaggregation using WebUI
To disable mDNS APVLANaggregation using the switch WebUI:
1. Navigate to Configuration > Advanced Services > All Profiles.
2. Under Profiles, select AP > APSystem > <Profile-Name>.
3. Under Basic > General, deselect the checkbox next to APmulticast aggregation.
4. Click Apply.
Disable AirGroup using CLI
To disable AirGroup using the switch CLI:
(host) (config) #airgroup disable
Disable mDNS APVLANAggregation using CLI
To disable mDNS APVLANaggregation using the switch CLI:
(host) (config) #ap system-profile <profile-name> no mcast-aggr
mDNS Multicast Response Propagation
In the AirGroup solution, all mDNS packets are terminated on the switch. The AirGroup solution works as a
unicast querier and responder on behalf of mDNS capable devices and eliminates the propagation of multicast
mDNS traffic in the WLAN.
For some services, terminating the mDNS packets at the switch does not allow the initial advertisement to
reach other devices. For example, the iChat or Messages Application uses mDNS response packet to announce
the arrival of a new user. The new user entry does not reach the existing users if the announcement or
response packet is not multicast. The exiting users get to know about the new user only after they send a
periodic query.
mDNS multicast response propagation allows services to multicast the response packet. This allows the
existing users to instantly see a new user when a new user logs in.
The mDNS response packet for iChat or Messages Application is multicast across all VLANs that are trunked in
the switch except:
n If the VLAN is globally disallowed.
n If the iChat service is disallowed for a VLAN.
In both scenarios, the mDNS response message is not propagated and:
n mDNS queries for iChat records from a disallowed VLAN are dropped.
n mDNS responses are not propagated to a disallowed VLAN.
n When an allowed VLAN is disallowed, users disappear from the buddy list of other users when they query
for the service next time. This may take a maximum of one hour.
n When a disallowed VLAN is allowed, wildcard queries are sent to all users for discovery.