Use the DNS Group - Server window to configure DNS servers for a DNS group within a specific address context.
The SBC Core supports up to eight DNS servers per DNS group. The SBC 5400/7000 platforms support up to 2,048 DNS Groups system-wide. The SBC SWe supports up to 128 DNS Groups. Refer to SBC Provisioning Limits for additional provisioning limitations.
On the SBC main screen, go to Configuration > System Provisioning > Category: Base Provisioning > DNS > DNS Group > Server or
All > Address Context > DNS Group > Server
The Server window opens showing all configured DNS servers. Use the Address Context and DNS Group drop-down lists to filter the list.
Figure 1: DNS Group - Server
A DNS server must be associated with a specific address context and DNS group. To create a DNS server:
Click New Server. The Create New Server window is displayed.
Figure 2: Create New Server Window
Use the following table to configure the options and then click Save.
Table 1: DNS Group - Server Parameters
Parameter | Description |
---|---|
Name | The name for the DNS server. |
State | The administrative state of the DNS server.
|
Recursion Desired | Specifies whether to use recursion for the DNS server:
|
IP Address V4 or V6 | Specifies the IP v4 or IPv6 IP address of the DNS server. |
Transport Protocol | Specifies the transport protocol to use for DNS queries to the DNS server. Options are:
|
TCP Fallback | Enable this option to support TCP fallback for queries to this server when the transport protocol is configured as UDP.
|
Priority | Specifies the DNS server priority. Must be 0-100; default is 0. |
Weight | Specifies the load-sharing weight for this DNS server. Must be 0-100,default is 0. |
Record Order | Specifies the record lookup order for the DNS server. The options are:
|
DSCP Value | Specifies the Differentiated Services Code Point (DSCP) value the SBC sends in the IP header of DNS queries to the specified DNS server. The range allowed is 0 to 63. The default is 0 |
To edit the configuration of a DNS group server:
To copy the configuration of a DNS group server and make changes to the copy:
To delete the configuration of a DNS group server:
Before deleting a DNS group, first delete the DNS local records and DNS servers in that group.