2010-09-16

Question of the day

вопрос:

бывает ли half-duplex на gigabit ethernet?

ответ:
вариант 1: да, см:
http://en.wikipedia.org/wiki/802.3ab
IEEE 802.3 chapter 40, section 3 page 149


вариант 2: нет:
# show interface status | include Gi0/1
Gi0/1                        connected    1          a-full a-1000 10/100/1000BaseTX
# conf t
(config)#int gi0/1
(config-if)#duplex half

% Duplex cannot be set to half when speed autonegotiation subset contains 1Gbps

SW4(config-if)#speed 1000
SW4(config-if)#duplex half
Gigabit port is restricted to full duplex

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