B

backbone areas, OSPF, 452 backbone layer (hierarchical network design), 129

BackboneFast (Cisco STP toolkit), 133, 250 backup links, 176 backups, WAN

backup links, 338-339

dial backup routing, 338 Internet, 341-343

permanent secondary links, 338-339 shadow PVC, 340

bandwidth, 13

domains, 14 EIGRP usage, 449 integrated IS-IS usage, 455 OSPF usage, 452 voice networks codec design, 536 cRTP, 533

QoS, 538

requirements for, 534-535 VAD, 534 voice traffic engineering requirements, 546 trunk capacity calculation, 552 WAN design, 320-321

congestion avoidance, 329-330 data compression, 322-324 ECN, 329-330 link utilization, 325-329 MLP, 324 PPP, 324 queuing, 325-329 RED, 329

traffic policing, 330-331 traffic shaping, 330-331 window size, 324-325 WRED, 329 BER (Bit Error Rates), WAN design, 318 Best Effort class (QoS), 359 best-effort transport (OSI model, transport layer), 8

BGP (Border Gateway Protocol), 457-458

EBGP, 460 IBGP, 460-461 implementation example, 459 routes filtering, 470 redistribution, 470 routing metrics, 441 BGP4+, 422

BHT (Busy Hour Traffic), voice traffic engineering, 547 BIA (Burned-In Addresses), 31-32 binary-to-decimal conversion chart, 809-812 bits (binary digits), 7, 242 blade servers, Enterprise Data Center networks, 271 blocking probability, voice traffic engineering, 546

blocking state (STP), 46 bottom-up design (network design methodologies), top-down design versus, 108

BPDU (Bridge Protocol Data Units), 857 BPDU Filtering (Cisco STP toolkit), 249 BPDU Guard (Cisco STP toolkit), 249

BPDU Skew Detection (Cisco STP toolkit), 250

Branch modules (Enterprise Architecture),

144-145, 157-158 Branch networks (Enterprise), WAN architectures, 353-355

large branch office design, 361-362 medium branch office design, 360 small branch office design, 356-358 branch office wireless networks (UWN) H-REAP, 640-641 local MAP, 638 REAP, 639-640 WLC placement, 642 BRI (Basic Rate Interfaces), ISDN, 493 Bridge mode (lightweight AP), 602 bridged wireless technologies, WAN, 310 bridges root bridges, 44-45 root ports, 44 switches versus, 15

broadcast data, 13 broadcast domains, 14 broadcast storms, 175 broadcasts directed broadcasts, 16 IP-directed broadcasts, 16, 37 BSS (Basic Service Sets), WLAN, 579 budgets, organizational constraints (network design methodologies), 78 Building Access Layer, 148

Enterprise Campus networks, 246 PAgP management, 252 routing, 252 server placement, 264 STP management, 248-250 trunk management, 251 VLAN management, 247 VLAN support, 257 modular voice network design, 179 routing, enterprise architecture deployments, 463 voice networks, 544-545

Building Distribution layer, 148

Enterprise Campus networks, 253 convergence, 256

deploying Layer 3 routing protocols to

Campus Core switches, 255-256 infrastructure services, 254

performance, 253 redundancy, 253-255 server placement, 264 VLAN support on building access layer switches, 257 modular voice network design, 179 routing, enterprise architecture deployments, 463 Bulk Data class (QoS), 358 busy hours, voice traffic engineering, 547

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