About Service Ports : Configuring a host label
  
Configuring a host label
Add a New Host Label displays the controls to add a new host label.
Name specifies the label name: for example, YouTube. These rules apply:
Host label names are case sensitive and can be any string consisting of letters, numbers, the underscore ( _ ), or the hyphen ( - ). There can’t be spaces in host labels.
Riverbed suggests starting the name with a letter or underscore.
To avoid confusion, don’t use a number for a host label.
You can’t delete host labels that a QoS or in-path rule is using.
Hostnames/Subnets specifies a comma-separated list of hostnames and subnets. Hostnames aren’t case sensitive. You can also separate hostname and subnet names with spaces or new lines.
Use this format:
xxx.xxx.xxx.xxx/xx where /xx is a subnet mask value between 0 and 32.
A host label can be a fully qualified domain name.
A hostname can appear in multiple host labels. You can use up to 100 unique hostnames.
A host label can contain up to 64 subnets and hostnames.
To remove a host label, selected the check box next to the name and click Remove Selected. You can’t delete host labels that a QoS or in-path rule is using.
Add New Host Label adds the host label. The page updates the host label table with the new host label. Because the system resolves new hostnames through the DNS, wait a few seconds and then refresh your browser.