parisons, 249-253 enhanced chassis, 237 managing spanning tree, 92 functionality, 231-233 VTP domains, 56 installing VSS, 253-263 VTP modes, 57 modules supported, 15, 231, 236, 240-249 VTP passwords, 58 supervisors and, 238 VTP pruning, 60 vertical enhanced chassis, 238 CBWFQ (class-based weighted fair queuing), Cisco 6509 device, 236 Cisco Call Manager (CCM), 526, 529 CCM (Cisco Call Manager), 526, 529 Cisco Connection Online (CCO), 538 CCO (Cisco Connection Online), 538 Cisco Discovery Protocol (CDP), 328 CDP (Cisco Discovery Protocol), 328 Cisco Express Forwarding (see CEF) CEF (Cisco Express Forwarding) Cisco routers configuring switching paths, 219 configuring switching paths, 216-220 functionality, 213-216 GRE and, 178 managing switching paths, 219 interrupt context switching, 207, 210-216 central office (CO), 344, 355 managing switching paths, 216-220 Challenge Handshake Authentication Protocol process switching, 207, 209-210 (CHAP), 442, 445-449 Cisco switches, 40 change control, 725-727 (see also specific switches) changeto command, 287, 488 protocol considerations, 40 Index trunk negotiation, 40 collect top command, 253 types of, 14 collision domains, 8 Cisco telephony terms, 528 collisions Cisco Unified Communication Manager late, 9 Express (CUCME), 529 in network segments, 7 Cisco Unified Communications Manager commit command, 305 (CUCM), 526, 529 committed information rate (CIR), 390, 604 Cisco Unity application, 529 Communication Media Module (CMM), 249 Cisco Unity Connection, 529 computer jerks, 727-730 Cisco Unity Express (CUE), 529 computer networks (see networks) CiscoView application, 238 config-sync feature (NX-OS), 80, 300-309 class maps, 594-595 configuration rollback, 309-312 Class of Service (CoS) configure sync command, 302 functionality, 581 congested networks QoS and, 577 about, 607 switches and, 223 determining if congested, 607-612 voice VLAN and, 336 resolving problems, 612 class-based weighted fair queuing (CBWFQ), congestion avoidance, 395 connection plar command, 543 class-map com