core layer, 23
distribution layer, 23-24
one-tier model, 26
redundant two-tier model, 27
router placement, 27
two-tier model, 26
peering router placement, 519-520
High-Level Data Link Control.
holddowns, 189
host subarea nodes, 440
hosts per subnet, calculating, 154-155
HPR (high-performance routing), 491-492
HSRP (Hot Standby Router Protocol), 16, 194-195
hub and spoke design, 299
hybrid routing protocols, 186
EIGRP, 236-237
DUAL finite-state machine, 238
Mobile IP, 240
neighbor discovery/recovery, 237
protocol-dependent modules, 238
RTP (reliable transport protocol), 238
VLSM, 240
route redistribution, 200-201
route summarization, 198
IBM SNA
dual-backbone Token Ring, 513
Proxy Explorer, 515-516
idle time, DLSw+, 539
I-frames (SDLC), 459
IGMP (Internet Group Management Protocol), 165
IGPs (Interior Gateway Protocols), 195-196
IGRP, 233-234.
count-to-infinity loops, preventing, 235
holddown, 235
metrics, 234
split horizon, 236
variance, 236
IKE (Internet Key Exchange), 575-576
Implementation Agreements, FRF12, 607
implementing
CBWFQ, 620
design, 12
fast switching, 192
fault-tolerant media, 15
reliable SNA networks
FEPs, 512
VLANs, 93, 95
inactive state (DLCI), 349
inactivity timers, 456
independent LUs, 443
information gathering, 9
infrared wireless networks, 89-90
infrastructure, campus networks, 52
insulation, shielding, 86
integrity, 55
interarea route summarization, 224
interface processors, VIP, 366
interfaces, supported on AXIS interface shelf, 128
internal routers, 219
Internet connectivity, analog, 391, 393
Internet Router Discovery Protocol (IRDP), 195
Internetwork Packet Exchange.
intranet, 164
Inverse ARP, 358