Index Q

P

Packet Internet groper (Ping) program

for connectivity, 69-70

defined, 506

for multicast, 327-328

Packet Level Protocol (PLP), 506

packet loss in best efforts networks, 357-358

packet mode connections, 504

Packet over Sonet (POS) interfaces, 308

Packet Switch Exchange (PSE), 508

packet-switched networks (PSNs), 508

packet switches, 504

packet switching, 504

packets

defined, 504

in MLS

candidate, 248-249, 248

enable, 249-250, 250-251

subsequent, 250

in OSI model, 11-12

in unicast, 285

packets command, 257

PAgP (Port Aggregation Protocol)

defined, 504

for redundant links, 186

PAP (Password Authentication Protocol), 504

parallel Fast EtherChannel links, 180

configuration for, 181-186

guidelines for, 180-181

parity checking, 505

partial mesh topology, 505

particle buffers, 410, 410, 505

Password Authentication Protocol (PAP), 504

passwords, 59

for 2950 switches, 59-61

for 3550 switches, 59-61

for 4000 switches, 59

for VTP, 108, 114

PAT (Port Address Translation), 505

paths

best path selection, 142-145

in campus networks, 9, 14

payload compression, 505

PCR (Peak Cell Rate), 505

PDNs (Public Data Networks), defined, 505

PDUs (Protocol Data Units)

in OSI model, 12

in unicast, 285

Peak Cell Rate (PCR), 505

peering problems, 28

per-hop routing

in best efforts networks, 357

defined, 505

Per-VLAN Spanning Tree (PVST), 150

defined, 508

operation of, 163-164

Per-VLAN Spanning Tree+ (PVST+)

defined, 508

operation of, 164-165

performance in campus networks, 4-6

permanent virtual circuits (PVCs), 508

permanent virtual paths (PVPs), 508

PFCs (Policy Feature Cards), 21

defined, 505

in MLS, 244

PGP (Pretty Good Privacy), 505

Physical layer, 12, 505

PIM (Protocol Independent Multicast), 22

defined, 505

enabling, 320-323

PIM DM (PIM dense mode)

defined, 506

for multicast delivery, 311-313, 312-313

for multicast routing, 321

PIM SM (PIM sparse mode)

defined, 506

for multicast delivery, 315-316, 315

for multicast routing, 321-322

PIM sparse-dense mode

defined, 506

enabling on interfaces, 322-323

Ping (Packet Internet groper) program

for connectivity, 69-70

defined, 506

for multicast, 327-328

plain old telephone service (POTS), 507

planning for multicast, 317-318

pleisochronous transmissions, 506

PLP (Packet Level Protocol), 506

PNNI (Private Network-Network Interface), 506

PNNI Topology State Packet (PTSP), 508

point-to-multipoint connections, 506

point-to-point connections, 506

Point-to-Point Protocol (PPP), 507

Points of Presence (POPs), 507

poison reverse updates, 506

policing

defined, 506

in DiffServ model, 359, 361

Policy Feature Cards (PFCs), 21

defined, 505

in MLS, 244

policy-map command, 366

polling, 506

POP (Post Office Protocol), 507

POPs (Points of Presence), 507

Port Address Translation (PAT), 505

Port Aggregation Protocol (PAgP)

defined, 504

for redundant links, 186

port block command, 459

port density, 507

port security, 507

PortFast, 187-188

and BPDUs, 189

configuring, 188-189

defined, 507

ports

in bridges vs. switches, 137

in Cisco switch model numbers, 20

console, 55-56

duplex configuration for, 68-69

Ethernet, 56

ID setting for, 171-172

in RSTP, 194

in show spantree, 152

in spanning tree operation, 142-143

cost setting, 171-173

designated, 142, 145

priority setting, 173-177, 175

root, 144-145

states of, 145-146, 146

speed setting, 68-69

for 2950 and 3550 switches, 68-69

for 4000 switches, 68

status LEDs for, 56

trunk, 103-105

POS (Packet over Sonet) interfaces, 308

Post Office Protocol (POP), 507

POTS (plain old telephone service), 507

PPP (Point-to-Point Protocol), 507

PPP callback, defined, 507

Predictor compression, 507

preemption in HSRP, 376

Presentation layer, 507

Pretty Good Privacy (PGP), 505

PRI (Primary Rate Interface), 507

priority

bridges, 143, 168-169

in GLBP, 383-384

ports, 173-177, 175

in spanning tree operation, 147

in TCI, 102

for traffic classes, 362, 362

priority-list command, 369-371

Priority Queuing, 363, 369-371, 507

Private Network-Network Interface (PNNI), 506

process switching, 266, 266, 507

processing delay

in best efforts networks, 357

defined, 507

PROM (programmable read-only memory), 508

propagation delays

with BPDUs, 144, 163

defined, 508

Protocol Data Units (PDUs)

in OSI model, 12

in unicast, 285

Protocol Independent Multicast (PIM), 22

defined, 505

enabling, 320-323

Protocol Independent Multicast dense mode

defined, 506

for multicast delivery, 311-313, 312-313

for multicast routing, 321

Protocol Independent Multicast sparse mode

defined, 506

for multicast delivery, 315-316, 315

for multicast routing, 321-322

Protocol Independent Multicast sparse-dense mode

defined, 506

enabling on interfaces, 322-323

protocol stacks, 508

protocols

defined, 508

in Gigabit Ethernet, 53-54

routing. See routing protocols

Proxy ARP, 508

proxy option, 329

pruning

defined, 508

in PIM DM, 311-312, 312

in PIM SM, 315, 315

in VTP, 117-119, 118

PSE (Packet Switch Exchange), 508

PSNs (packet-switched networks), 508

PSTNs (Public Switched Telephone Networks), 508

PTSP (PNNI Topology State Packet), 508

Public Data Networks (PDNs), 505

PVCs (permanent virtual circuits), 508

PVP tunneling, 508

PVPs (permanent virtual paths), 508

PVST (Per-VLAN Spanning Tree), 150

defined, 508

operation of, 163-164

PVST+ (Per-VLAN Spanning Tree+)

defined, 508

operation of, 164-165