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IN-17
Catalyst 2940 Switch Software Configuration Guide
78-15507-02
BPDU filtering
described
12-3
enabling 12-11
BPDU guard
described
12-2
enabling 12-11
BPDU message exchange 11-2
configuration guidelines 11-11, 12-10
configuring
forward-delay time
11-19
hello time 11-18
maximum aging time 11-19
path cost 11-16
port priority 11-14
root switch 11-12
secondary root switch 11-14
switch priority 11-17
default configuration 11-10
default optional feature configuration 12-9
designated port, defined 11-3
designated switch, defined 11-3
detecting indirect link failures 12-5
displaying status 11-20
EtherChannel guard
described
12-7
enabling 12-14
extended system ID
affects on root switch
11-12
affects on the secondary root switch 11-14
overview 11-3
unexpected behavior 11-12
features supported 1-3
inferior BPDU 11-3
instances supported 11-9
interface state, blocking to forwarding 12-1
interface states
blocking
11-5
disabled 11-6
forwarding 11-5, 11-6
learning 11-6
listening 11-6
overview 11-4
interoperability and compatibility among modes 11-9
limitations with 802.1Q trunks 11-9
load sharing
overview
13-18
using path costs 13-20
using port priorities 13-18
loop guard
described
12-9
enabling 12-15
modes supported 11-9
multicast addresses, affect of 11-8
overview 11-2
path costs 13-20, 13-21
Port Fast
described
12-1
enabling 12-10
port priorities 13-19
preventing root switch selection 12-8
protocols supported 11-9
redundant connectivity 11-7
root guard
described
12-8
enabling 12-14
root port, defined 11-3
root switch
affects of extended system ID
11-3, 11-12
configuring 11-12
election 11-3
unexpected behavior 11-12
shutdown Port Fast-enabled port 12-2
superior BPDU 11-3
timers, described 11-18
UplinkFast
described
12-3
enabling 12-12
stratum, NTP 6-2