The mask covers all bit without regard to the boundary. For example, FFFF would cover all nodes, FFFFF would cover all nodes and the last byte of the network address | APOLLO DOMAIN Key Commands Shows and Debugs Apollo routing host-address Apollo routing 123a interface ethernet 0 Apollo network 4ac Apollo access-list MyAcessList deny FFFF Can use a range optional Apollo access-list MyAccessList deny FFFF interface ethernet 0 apollo access-group MyAccessList apollo route 4ac apollo maximum-paths 2 Show apollo interface Show apollo route Show apollo arp Show apollo traffic Additional Commands Spot The Issue Node address is unique for entire router E0 can be SO can be The mask covers all bit without regard to the boundary. For example FFFF would cover all nodes FFFFF would cover all nodes and the last byte of the network address Notes Apollo addresses 12 bit network number in HEX 20 bit host in HEX - format Permit FFFF - is permit .