ongestion, QoS and, 428 command, 68-72 connected interfaces, redistributing in CRC6 (Cyclic Redundancy Check EIGRP, 153 (6-bit)), 276 connected routes, 131 crossbar fabric bus, 207 redistributing into RIP, 134 crossbar switching bus, 206 redistribution into EIGRP, 144 cryptographic features, IDSMs, 221 connections, 3 CSMs (Content Switching Modules), 204, showing all active connections on PIX 219, 396, 398, 405-413 firewall, 391 common tasks, 407-411 consulting costs, 527 configuring, 401-404 Content Switches, 398 client VLAN, 402 Content Switching Modules (see CSMs) load-balanced network content-addressable memory table (CAM (example), 405-407 table), 12 port redirection, 404 contexts (multiple), support by FWSM, 218 real servers, 402 control packets (RIP updates), 135 server farms, 403 converged network, 447-458 server VLAN, 402 configuration, 447 virtual servers, 403 monitoring QoS, 449-452 implementing SLB, 398 troubleshooting, 452-458 upgrading, 411-413 default queue too large, 458 CSU/DSU (Channel Service Unit/Data default queue too small, 458 Service Unit), 257 incorrect queue configuration, 452 configuration, 283 nonpriority queue too large, 457 integrated CSU/DSU WICs, 282 nonpriority queue too small, 456 loopback tests, 280-282 priority queue too large, 455 troubleshooting, 284-287 priority queue too small, 454 custom queuing, 426 convergence, 112 customer premises equipment (CPE), 257 cooling on chassis switches, 17 Cyclic Redundancy Check (6-bit) cooling requirements, documenting in (CRC6), 276 network design, 469-471 copy running startup command, 389 core (network) area, OSPF, 122 core, distribution, and access levels (three-tier D bus (data bus), 207 network model), 473 D4/superframe, 273 corporate networks, 473-477 DACCS (Digital Access Cross-Connect collapsed core-no distribution, 474 System), 258 collapsed core-no distribution or dangers of upgrading, 537 access, 476 data bus (D bus), 207 configuration concerns, 476 data channel, 259, 270 NTP hierarchy, 509 data link control identifiers (see DLCI