Cisco ME-3400G-12CS-A-RF - Ethernet Access Switch Manual de usuario Pagina 125

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© 2009 Cisco Systems, Inc. All rights reserved.
126
Cisco PublicBRKBBA-2006
Cisco Spanning Tree Toolkit
PortFast
for Edge Ports
(0-30 secs)
UplinkFast
for direct Root link failure
(3-30 sec)
BackboneFast
for indirect link failure
(30 to 50 sec)
Now standardized with 802.1w/.1d
Root B- Root
Access
3
2
1
3
2
1
RootGuard:
prevents an external switch from becoming root
BPDU-Guard:
Disables a portfast non-trunk port if it receives a BPDU
BPDU Filtering:
Filters outgoing and received BPDUs
4
4
BAD
B
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