05-07-2010 10:11 AM - last edited on 03-25-2019 04:10 PM by ciscomoderator
I have a 3550 ans 3560 switches connected together over three link, so I configured switch port mode to be desirable on the 3560 and switch port mode auto on the 3550. they trunk normaly, but when i configure portchannel like the config below, they port chanel never come up
3560................
interface Port-channel14
switchport mode dynamic desirable
nterface FastEthernet0/19
switchport mode dynamic desirable
channel-group 14 mode on
!
interface FastEthernet0/20
switchport mode dynamic desirable
channel-group 14 mode on
!
interface FastEthernet0/21
switchport mode dynamic desirable
channel-group 14 mode on
3560(config-if)#do sh ethe summ
14 Po14(SD) - Fa0/19(D) Fa0/20(D) Fa0/21(D)
3550..................
interface Port-channel14
switchport mode dynamic auto
interface FastEthernet0/13
switchport mode dynamic auto
channel-group 14 mode on
!
interface FastEthernet0/14
switchport mode dynamic auto
channel-group 14 mode on
!
interface FastEthernet0/15
switchport mode dynamic auto
channel-group 14 mode on
3550(config-if-range)#do sh ether summ
14 Po14(SD) - Fa0/13(D) Fa0/14(D) Fa0/15(D)
05-07-2010 12:48 PM
Hi,
change "channel-group 14 mode on" to
"channel-group 14 mode desirable" and test again.
HTH
Reza
05-07-2010 02:33 PM
Are the physical interfaces up? I know it´s a stupid question but since you have "channel-group 14 mode on" on the interfaces should come up as standalone (I) or suspended (s) in case of a channel misconfig
05-07-2010 11:02 PM
Changing the channel-group mode to desirable means using Pagp, I want to use same config.
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