L (phase-locked loop), 284 blocking state, 73 plugs and receptacles for AC power feeds, 17 configured for PortFast, preventing from point-to-multipoint networks, support by receiving BPDUs, 81 OSPF, 125 designated port on each segment, 75 point-to-point networks, 3 information about, in CatOS, 223 support by OSPF, 124 load balancing using source and/or VPNs (virtual private networks), 150 destination port, 58 point-to-point subinterfaces, 314 root port on each bridge, 75 no IP address-to-DLCI mapping, 315 security, shutting down switch ports not Point-to-Point Tunneling Protocol in use, 49 (PPTP), 162 spanning tree states, 76 poison reverse, 111 switch port, changing to router port on policing packets (QoS), 422 switches, 198 policy maps, 437 trunk ports, 25 applying to an interface, 438 port-security violations, actions taken in converged network, 448 response, 239 showing specified queues, 450 Post Office Protocol (POP) policy routing, 173 bandwidth requirements in QoS, 434 example, 175-180 priority in QoS, 433 applying policy to Ethernet POTS (plain-old telephone service), 264 interfaces, 178 power requirements, 469-471 monitoring policy routing, 178-180 planning for chassis switch, 16 politics in network design, 521-523 PPP (Point-to-Point Protocol) POP (Post Office Protocol) authentication, 347-353, 356 bandwidth requirements in QoS CHAP (Challenge Handshake scheme, 434 Authentication Protocol), 349-353 priority in QoS, 433 changing sent hostname, 352 port ACLs, 334 one-way authentication, 350 port adapters, CMM, 222 two-way authentication, 351 Port Address Translation (see PAT) method list, 359 Port Aggregation Control Protocol applying to an interface, 360 (PAgP), 60 PAP (Password Authentication CatOS EtherChannel, 61 Protocol), 347 port channel interface (IOS debugging PPP authentication, 348 EtherChannel), 55, 62 ppp chap hostname command, 352 port layout spreadsheets, 463-466 ppp chap interface commands, 353 port redirection, 386 ppp pap sent-username command, 347 configuring in CSMs, 404 two-way authen