Cisco Cisco Expressway 维护手册
Caching DNS records
To improve performance, DNS lookups may be cached. This cache is flushed automatically whenever the
DNS configuration is changed.
DNS configuration is changed.
You can also force the cache to be flushed by clicking Flush DNS cache.
Configuring Quality of Service settings
The
Quality of Service
(QoS) page (
System > Quality of Service
) is used to configure QoS options for
outbound traffic from the Expressway.
This allows the network administrator to tag all signaling and media packets flowing through the Expressway
with one specific QoS tag and hence provide the ability to prioritize video traffic over normal data traffic.
Management traffic, for example SNMP messages, is not tagged.
with one specific QoS tag and hence provide the ability to prioritize video traffic over normal data traffic.
Management traffic, for example SNMP messages, is not tagged.
Supported mechanisms
The Expressway supports the DiffServ (Differentiated Services) mechanism which puts the specified Tag
value in the TOS (Type Of Service) field of the IPv4 header or TC (Traffic Class) field of the IPv6 header.
value in the TOS (Type Of Service) field of the IPv4 header or TC (Traffic Class) field of the IPv6 header.
Cisco Expressway Administrator Guide (X8.1)
Page 24 of 344
Network and system settings
Network settings