H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 746)

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Working mechanism
IMPORTANT:
•
The Bonjour gateway discards queries received from the wired network.
• The Bonjour gateway filters queries and responses according to user-defined Bonjour policies. This
section focuses on only the Bonjour gateway working mechanism. For more information about Bonjour
policies, see " Configuring a Bonjour policy ."
• Bonjour service advertisement snooping
The service devices send Bonjour responses to advertise their supporting services. Upon receiving
the Bonjour responses, the AC creates a service-device mapping table to store service information
about the service devices. When a client queries for a service, the Bonjour gateway searches the
service-device mapping table and sends a response to the client.
As shown in
Figure 475 , Bonjour service advertisement snooping operates as follows:
a. Apple TV and Print send Bonjour responses to advertise their supporting services.
b. Upon receiving the Bonjour responses, the AC creates a service-device mapping table to store
service information about Apple TV and Print.
c. iPad queries for the service of Apple TV or Print and the AC sends a response to iPad.
Figure 754 Bonjour service advertisement snooping
• Bonjour query snooping and response
When a client queries for a service that is not in the service-device mapping table, the Bonjour
gateway forwards the query. After receiving a response, the Bonjour gateway adds the service
information to the service-device mapping table and forwards the response to the client.
As shown in
Figure 476 , Bonjour query snooping and response operates as follows:
a. iPad queries for the printing service, and the AP sends the query to the AC through the
CAPWAP tunnel.
b. The AC forwards the query to the configured VLANs because it does not find any printing
service entries in the service-device mapping table.
c. Upon receiving the query, the print service sends a response to the AC.
d. The AC adds the service information to the service-device mapping table and forwards the
response to iPad.