Channel Group Configuration

Answered Question

Good Morning,

Trying to create a channel group to a UNIX box setup for server backups. Group sets up okay. SH Interface shows it to be a 2gb link. Problem is only getting 1gb throughput. UNIX has two (2) NICs with same MAC and IP, and here is the config on the switch:

interface Port-channel205

description Channel-Group For TSMBCKUP-G-2/35 & 2/36

switchport

switchport access vlan 8

switchport trunk encapsulation dot1q

switchport mode access

no ip address

interface GigabitEthernet2/35

description TSM - CHASSIS 1 - SLOT-7 B (Rack 506)

switchport

switchport access vlan 8

switchport mode access

no ip address

duplex full

channel-group 205 mode on

end

interface GigabitEthernet2/36

description TSM - CHASSIS 1 - SLOT-7 A (Rack 506)

switchport

switchport access vlan 8

switchport mode access

no ip address

duplex full

channel-group 205 mode on

end

Can someone please tell me where I have made my error.

Thanks again for your assistance.

Dave Holder

Correct Answer by Giuseppe Larosa about 8 years 2 months ago

Hello Dave,

member links need to be configured as trunk ports too.

advice:

after the channel is up to modify the list of allowed vlans do it only on the logical port-channel, or you can experience big problems like bridging loops.

for better load-balancing try to use

port-channel load-balance src-dst-port

this is available on some platforms like C6500.

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Thu, 12/04/2008 - 07:07

Hello Dave,

member links need to be configured as trunk ports too.

advice:

after the channel is up to modify the list of allowed vlans do it only on the logical port-channel, or you can experience big problems like bridging loops.

for better load-balancing try to use

port-channel load-balance src-dst-port

this is available on some platforms like C6500.

Hope to help

Giuseppe

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