Hi,
The ERO as u said is the output of cspf on the local area database that has been constructed by flooding.

now that once u have the database we can directly check out all the LSR interfaces that satisfy the constraint say some b units of bandwidth, starting from ingress to egress.

now that we have a list we ought to do a strict source routing through the LSR as they match the criteria .

if we specify a loose source routing it may lead us to a router which does not match the criteria.

so essentially all the LSR in the ERO should be a strict route.

so can u explain the appearance of loose route in the ERO.