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10.35.25.32/28 10.133.3.11 OSPF-EXT1 3 if-illneveranswerquestionsagain-10.133.3.11
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10.35.8.192/27 10.133.3.11 OSPF-EXT1 3 if-servermgmt.cntx03-servermgmt-10.133.3.11
10.35.9.128/28 10.133.3.11 OSPF-EXT1 3 if-servermgmt.cntx03-servermgmt-10.133.3.11
####
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10.35.25.32/28 10.133.3.11 OSPF-EXT1 3 if-illneveranswerquestionsagain-10.133.3.11
####
perl -ne '/^(\S+)/;if($S{$1}){print$S{$1}unless$s{$1}++;print}$S{$1}=$_' file