See also link-state routing
split horizons, preventing routing loops, 109
standard ACL (Access Control Lists), 211
named standard IP ACL, 234
numbered standard IPv4 ACL, 222-227
star topologies, Frame Relay DLCI, 329
stateless autocon?¬?guration of IPv6 address
assignments, 279-281
statements (ACL), 210
static learning (Catalyst switch port security),
72
Static NAT (Network Address Translation),
251, 256
static routing, overview of, 98
Static VLAN port membership mode
(Catalyst switches), 24
STP (Spanning Tree Protocol), 49
bridges
BID, 51, 58
blocking port state, 52-53
disabled port state, 52
forwarding port state, 53
listening port state, 52-53
port states, 51
root bridge election, 50
root bridge selection, 51-52
root port selection on nonroot bridges,
50
Catalyst switches, 63
convergence, 56
CST, 56
loops, avoiding, 50
MSTP, 59-61
operation example, 54
path cost example, 55
PortFast, 53-54
protocol verification, 62
PVRST+, 59-61
PVST+
BID, 58
Catalyst switches, 61
VID, 57
recalculation example, 56
root bridges, 87
RSTP, 58-59
port roles, 60
port states, 60-61
verifying con?¬?guration of, 87
segments, designated port selection, 50
switch security, 70
troubleshooting, 88
bridging loops, 86
logging events, 86
network diagrams, 85-86
root bridges, 87
temporarily disabling unnecessary
features, 87
verifying RSTP con?¬?guration, 87
stub area ?¬‚ags, hello packets, 143
Subinterface con?¬?guration mode (IOS
Software), 5
subinterfaces, Frame Relay networks,
330-331
multipoint subinterfaces, 336-339
point-to-point subinterfaces, 336-338
subnets
address creation, 124
calculating the number of usuable subnets,
124
VLSM, 123, 133
bene?¬?ts of, 125
calculating networks, 126
calculating subnet addresses, 128
route summarization, 128-132
subnetting subnetted addresses, 126
successor routes, EIGRP, 173
summarizing routes, VLSM, 128-132
supernetting.
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