9.20 does not allow "LIKE" operator to be used with ifSpeed , while setting filter conditions for Interface groups. But this was allowed in 9.1.customer had an interface group with 9.10 which contains a filter condition "ifSpeed LIKE 12300" . This worked in 9.1. However, this filter condition is invalid in 9.20.After upgraded to 9.20, this group of interfaces in Monitoring settings are shown as "Unknown Object" . A part of the topology is not being polled .Since "ifSpeed" has integer values, it should not be compared using "LIKE" operator. Hence "LIKE" should not be used with ifSpeed. Since 9.1 config allowed the "LIKE"
operator, the migration code is expected to have handled this during upgrade.