This names a standard IP access list that filters which routes are actually imported when redistributing routes from one routing protocol source into another on this device. Administrators use it to control precisely which routes cross protocol boundaries during redistribution, preventing unwanted or overly broad route leaking between protocols like OSPF, RIP, or static routes. If this object references an access list named "PERMIT-INTERNAL-ONLY," only routes matching that list's criteria would be redistributed, while leaving it unspecified means all routes are redistributed per the object's own rules.