1Q) trunks
frames, 25
VLAN, 24-26, 32-35
switch security, 71
VLAN, 23
Ethernet (802.1Q) trunks,
25-26, 32-35
VTP, 26-32
TTL (Time-To-Live) values (IP packets), 108
tunneling IPv6 integration methods, 285-286
dynamic 6to4 method, 284
ISATAP protocol method, 284
manual IPv6-over-IPv4 method, 283
Teredo tunneling method, 284
U - V
unequal-cost load balancing, EIGRP, 182
unicast addresses (IPv6)
global addresses, 275-276
loopback addresses, 276
private addresses, 275
reserved addresses, 275
unspecified addresses, 276
updates (triggered), distance vector route
maintenance, 111-115
User EXEC mode (IOS Software), 4
username command, 321
VC (Virtual Circuits), Frame Relay networks,
326-327
VID (VLAN ID), PVST+, 57
VLAN (Virtual Local Area Networks), 40
adding, 38-39
Catalyst switches, 23-24
common network components, 20
configuring
Ethernet (802.1Q) trunks, 32-35
port assignments, 37-38
VTP, 30-32
creating, 35-36
deleting, 38-39
displaying, 36
hierarchical network addressing schemes,
benefits of, 16-17
inter-VLAN routing, 64-66
IP addressing schemes, 17
modifying, 38-39
name command, 35
network design example, 18-20
poorly designed networks, issues stemming
from, 14
PVRST+, 59-61
PVST+
BID, 58
Catalyst switches, 61
VID, 57
STP, root bridge configuration, 63
traffic types, 21
troubleshooting
inter-VLAN connectivity, 81
IP subnets, 81
native VLAN mismatches, 80
port connectivity, 79
trunk mode mismatches, 81
VTP, 82-85
trunks, 23
Ethernet (802.
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