Cisco Cisco Expressway Maintenance Manual
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.
Static routes
You can define static routes from the Expressway to an IPv4 or IPv6 address range. Go to
System
> Network interfaces > Static routes
.
On this page you can view, add, and delete static routes.
Static routes are sometimes required when using the Advanced Networking option and deploying the
Expressway in a DMZ. They may also be required in other complex network deployments.
Expressway in a DMZ. They may also be required in other complex network deployments.
To add a static route:
1. Enter the base destination address of the new static route from this Expressway
For example, enter 203.0.113.0 or 2001:db8::
2. Enter the prefix length that defines the range
Extending the example, you could enter 24 to define the IPv4 range 203.0.113.0 - 203.0.113.255, or 32 to
define the IPv6 range 2001:db8:: to 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff.
The address range field shows the range calculated by the Expressway from the IP address and Prefix
length.
define the IPv6 range 2001:db8:: to 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff.
The address range field shows the range calculated by the Expressway from the IP address and Prefix
length.
3. Enter the IP address of the gateway for your new route
4. Select an ethernet interface for your new route
This option is only available if the second ethernet interface is enabled. Select LAN 1 or LAN 2 to force
the route via that interface, or select Auto to allow the Expressway to make this route on either interface.
the route via that interface, or select Auto to allow the Expressway to make this route on either interface.
5. Click Create route
The new static route is listed in the table. You can delete routes from this table if necessary.
Notes
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Cisco Expressway Administrator Guide (X8.5.1)
Page 26 of 399
Network and system settings
Network settings