Table 12-1: Fast Ethernet and Gigabit Ethernet Trunking Modes Mode Function
on
Puts the port into permanent trunking mode and negotiates to convert the
link into a trunk link. The port becomes a trunk port even if the
neighboring port does not agree to the change.
off
Puts the port into permanent nontrunking mode and negotiates to convert the
link into a nontrunk link. The port becomes a nontrunk port even if the
neighboring port does not agree to the change.
desirable
Makes the port actively attempt to convert the link to a trunk link. The
port becomes a trunk port if the neighboring port is set to on, desirable,
or auto mode.
auto
Makes the port willing to convert the link to a trunk link. The port becomes
a trunk port if the neighboring port is set to on or desirable mode. This is
the default mode for Fast and Gigabit Ethernet ports.
nonegotiate
Puts the port into permanent trunking mode but prevents the port from
generating DTP frames. You must configure the neighboring port manually as a
trunk port to establish a trunk link.
from my readings, "Desirable" is the best option to use for
interoperability. Although ON should be equally effective in forcing the
link into "Trunking" mode. Auto is OK, if one side is set to ON or Auto, but
would be better switched to desirable on those ports which are part of a
trunk group.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/e
_trunk.htm (Watch for Wrap)
Ken Claussen MCSE CCNA CCA
[EMAIL PROTECTED]
"The Mind is a Terrible thing to Waste!"
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Lopez, Robert
Sent: Tuesday, April 17, 2001 9:54 AM
To: [EMAIL PROTECTED]
Subject: trunking modes [7:902]
Is there any "rule of thumb" when it comes to determining which trunking
mode to use. I'm in an environment where about a dozen trunks exist between
4 6509's. The trunking modes have been set using "on", "desirable" and
"auto". Is there any need to have them uniform in appearance? For example,
one side of the link "desirable", the other side "auto".
>From what I'm reading, I'm thinking since these 6509's are in the core of
our network, the setting should be to "on" throughout. Any suggestions? TIA!
Robert
Robert M. Lopez
Network Planning
Ann Arbor Data Center
Pfizer Global Research & Development
Phone 734-622-3948 Fax 734-622-1690
"There are only two ways to live your life. One is as though nothing is
a miracle. The other is as though everything is a miracle." ...Albert
Einstein
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=923&t=902
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
