stacked switches, 14 source-quench ICMP messages, 333 stacking, 227 space (T1 signaling), 270 stacking GBICs, 227 SPAN (Switched Port Analyzer), 241-244 stack-member#/module#/port# interface configuring with monitor command, 241 type, 228 spanning tree, 66-88 standardizing properly sized production BackboneFast feature, 83 network, 525 BPDU Guard feature, 81 Index standby PIX firewall, 378 subnets, 95, 98 forcing to become active PIX, 383 allocating IP subnets, 494-498 saving configuration changes to, 389 divide by half allocation, 496 switching roles with active PIX, 382 reverse binary allocation, 497 taking over from failed active sequential allocation, 494 firewall, 379 group of subnets (see summary routes) standby preempt command, 165 IP subnetting made easy, 498-505 standby priority statement, 165 subnets keyword, using with redistribute standby routers, 164 command in OSPF, 138 taking over for active router when it subnettable ranges, 493 fails, 166 subset advertisements, 45 standby track command, 168 summarization of routes stateful failover, 378, 379 EIGRP, 119 configuring failover interface for, 381 RIPv2, 116 CSMs, dedicated VLAN for, 401 summary advertisements, 45 statistics for link, 382 summary LSAs for ABRs, 122 static command, 384 summary LSAs for ASBRs, 122 DMZ servers, access from Internet, 388 summary routes, 95, 98 including port numbers, 387 supernets vs., 99 overriding nat command, 385 superframe (D4), 273 static routes, 131 supernets, 95, 100 redistributing into RIPv2, 132 summary routes vs., 99 static secure MAC addresses, 238 supervisors, 211 sticky command, 403 models, 212 sticky connections, 399 MSFC, 211 sticky secure MAC addresses, 238 SFMs (Switch Fabric Modules) vs., 213 storm control, 233-238 sups (see supervisors) storm-control action command, 235 SVCs (switched virtual circuits), frame storm-control command, 235 relay, 299 STP (Spanning Tree Protocol), 66, 233 SVIs (switched virtual interfaces) (see also spanning tree) configuring, 198-201 stratum (NTP), 507 hybrid mode, 201-203 s