 masks switch console command, 227 about, 663-669 Switch Fabric Module (SFM), 233, 235-237 IPv6 addresses and, 675, 676 switch preempt command, 255 as wildcard masks, 416 switch priority command, 255 subnets switch profiles, 302 allocating, 658-669 switch renumber command, 318 defined, 109, 112 switch virtual dual-active summary command, divide-by-half allocation method, 660 IP routing table, 112 switch virtual link command, 256 IPv6 addresses and, 673, 677-678 switchback command, 287, 488 principles of, 663-669 Switched Port Analyzer (SPAN), 332-335 reverse binary allocation method, 660 switched virtual circuit (SVC), 387 sequential allocation method, 658-660 switched virtual interfaces (see SVIs) VLSM support, 652 switches, 10 subset advertisements, 52 (see also specific types of switches) summary advertisements, 52 bridges and, 81 summary LSAs, 138 broadcasts and, 8 summary route defined, 10 defined, 109, 112, 655 dual-active scenario, 260 IP routing table, 112, 655 functionality, 11-13 superframe framing, 360 hub comparison, 10, 11 supernet NEBS-compliant, 17, 231 defined, 109, 114 root bridges and, 89 IP routing table, 114 small office VoIP example, 535 Supervisor-1A model, 239 split-brain scenario, 260 Supervisor-2 model, 238, 239 stacking, 14, 317-319 Supervisor-32 model, 239 types of, 14-15 Supervisor-720 model VLANs on, 25 Cisco 6509 and, 237 VTP domains and, 50 connectors for, 240 VTP transparent, 51 functionality, 240 switching Index Cisco routers and, 207 types of, 356 defined, 11, 207 TACACS+ protocol interrupt context switching, 207, 210-216 custom groups, 452 optimum, 213 default server groups, 451 process switching, 207, 209-210, 216-217 functionality, 450 switchport access command, 34 tacacs-server command, 451 switchport access vlan command, 36 tag, frames, 38 switchport backup interface command, 324 tagging switchport broadcast command, 326 routes, 159-162 switchport command, 222 VLAN, 39 switchport mode access command, 42 tail command, 508 switchport mode fex-fabric command, 292 TCP packets, 1