When looking at a device in CAPC, no ifAlias is present for the interfaces.
CA Performance Management
The device either does not have the ifAlias OID (18.104.22.168.22.214.171.124.1.1.18) or is returning blank values for that OID.
This can be verified by using an SNMP walk utility such as sapwalk or the Spectrum MIB browser
Please contact the vendor of the device if this should be populated on the device.