nt-to-point VPNs, 167 Primary Rate Interface (PRI), 347, 357 poison reverse, 128 priorities policing packets, 578 LLQ scenario, 590-592 policy feature card (PFC), 238 QoS considerations, 578-581 policy maps, 596 priority command, 596 policy routing priority percent command, 596 defined, 198, 200 priority queuing, 582, 621-624 example, 200-203 private branch exchange (PBX), 350, 527 monitoring, 203-205 Private Line Automatic Ringdown (PLAR), policy-map command, 536 port ACLS, 427-428 private virtual circuits (PVCs), 602 port adapters, 249 privilege levels, 440 Port Address Translation (see PAT) problem escalation, 704 Port Aggregation Control Protocol (PAgP), 68, problem solving, 700-704, 724 process switching port channel interfaces, 63 configuring switching paths, 216-217 port layout spreadsheets, 629-633 defined, 207, 209 port redirection, 504 managing switching paths, 216-217 port security, 329-332 steps for, 209-210 port speed, 390 processing delay, 348-349 port-object command, 476 propagation delay, 348 PortFast feature (spanning tree), 95 Protected Extensible Authentication Protocol ports (PEAP), 514 documenting layouts, 629-633 proxy servers, 555 FEX considerations, 271 PSK (preshared keys), 515 network design considerations, 642 PTT (Push To Talk) button, 549 small office VoIP example, 535, 542 Push To Talk (PTT) button, 549 states supported, 90 PVC (permanent virtual circuit), 387, 401, 403- POTS (plain-old telephone service), 351, 528, 551-553 PVCs (private virtual circuits), 602 power considerations PVDM (Packet Voice Digital Signal Processor), chassis-based switches, 16 documenting, 634 PVST (Per-VLAN Spanning Tree), 91 planning rack space, 634 Power over Ethernet (PoE), 527 QoS (Quality of Service) Index about, 573-577 defined, 122, 147 Catalyst 3750 support, 338-340 EIGRP and, 152-154 common misconceptions, 586-588 limiting, 159-166 configuring routers, 594-598 mutual, 156 congested networks and, 612 OSPF and, 154-156 IP prioritization, 578-581 process steps, 147 LLQ and, 223, 589-593 real-world exa