[CentOS] The most weird thing i've ever seen (networking)
cboyd at gizmopartners.com
Mon Mar 5 01:20:09 UTC 2007
On Mar 4, 2007, at 7:01 PM, Radu-Cristian FOTESCU wrote:
> What have a Cisco switch and the DHCP to do
> with an interface not coming up at all?!
Some Cisco switches take a long time to negotiate link speed, duplex,
and bridge forwarding when left at default settings. This causes the
initial DHCP requests to time out, leaving you with no IP address as
the box comes up. dhclient should finally run again and get an
address, but it can take a few minutes.
You can speed this up by using the "portfast" keyword, but do be
careful and read up on it before enabling it. Portfast on the wrong
port can cause a network meltdown.
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