ng support, 38 head command (NX-OS), 278 usage considerations, 40 High-Speed Serial Interface (HSSI), 379 VLAN tagging, 39 hop count (metric), 123 IEEE 302.3ad standard, 68 host ports, 271 IETF (Internet Engineering Task Force), 672, host route defined, 109, 111 if-needed method, 456 IP routing table, 111 IGP (internal gateway protocol), 127 hostnames IGRP (Interior Gateway Routing Protocol) CHAP authentication and, 447-449 administrative distance, 107, 126 naming conventions, 637 communication considerations, 120 Hot Standby Router Protocol (see HSRP) in-band signaling, 359 HSRP (Hot Standby Router Protocol) include command (NX-OS), 278 functionality, 181-184 incoming called-number command, 554 interface tracking, 184-186 infrastructure wireless networks, 511 Nexus and, 189 initializing state, 90 two-link failover scenario, 186-188 inspections, 477-479 HSRP groups, 181 install all command, 313 HSRP interface tracking, 185-186 install command, 313 HSSI (High-Speed Serial Interface), 379 Integrated Services Digital Network (ISDN), HTTP packets, 575 hub and spoke networks, 391 Inter-Switch Link (see ISL) interexchange carrier (IXC), 347 bridges and, 81 interface command, 277, 401 defined, 5 interface macros, 321 functionality, 5-10 interface port-channel command, 64 switch comparison, 10, 11 interface range command, 35, 535 human command (NX-OS), 278 interface range macro command, 320 hybrid mode interface ranges, 319 configuring SVIs, 225-227 interface vlan command, 224 defined, 222 interfaces ASA firewalls and, 470-473 contexts and, 489 failover, 492-493 mapping, 632 Index multicontext ASAs and, 482-484 VTP modes, 56 PAT examples, 502-504 VTP passwords, 57 Interior Gateway Routing Protocol (IGRP) VTP pruning, 59 administrative distance, 107, 126 IP addresses communication considerations, 120 allocating space, 656-658 Intermediate System-Intermediate System (IS- availability of, 671 IS), 107, 126 displaying as names (ASA), 473-474 internal gateway protocol (IGP), 127 mapping, 389 internal routers, 138 public versu