Hi Everyone
I
created an etherchannel on two ports (2960 switch) and placed them into
an etherchannel. Did the same on the other switch Cisco 3020 blade
chassis switch. Without connecting any cables the 2960 had done an
up/down sequence as though a cable had been connected and yet this had
not been done. Can someone try and help with what could be the
technical explanation of this interesting phenomena. the etherchannel
was a trunk and the ports were sitting in vlan 200 and this vlan was
also configured as the native vlan for the trunk.
Please, please help - any comment is appreciated.
Sydney
Hi Sydney,
It can be possible that speed and duplex setting between the switches are not in sync. Configure all interfaces in an EtherChannel to operate at the same speeds and duplex modes.Enable all interfaces in an EtherChannel. If you shut down an interface in an EtherChannel, it is treated as a link failure, and its traffic is transferred to one of the remaining interfaces in the EtherChannel.
For EtherChannels:
–Assign all interfaces in the EtherChannel to the same VLAN, or configure them as trunks.
–If you configure an EtherChannel from trunk interfaces, verify that the trunking mode (802.1Q) is the same on all the trunks. Inconsistent trunk modes on EtherChannel interfaces can have unexpected results.
–An EtherChannel supports the same allowed range of VLANs on all the interfaces in a trunking Layer 2
Hope to help
If helpful do rate the post
Ganesh.H
