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New Member

Multiple links between switches

In our network we have some catalist switches.

On one of the switches (an 2960) we have connected the servers (most with teamed 1Gb LAN interfaces).

Another switch (an 3550) has 1Gb fiber links to the switches in the rest of the office. To increase bandwith to the servers we want to connect the 2960 (server switch) with multiple ethernet links to the 3550 (fibre switch). Is this possible and, if so, where do I start.

Regards,

Elmar

3 REPLIES

Re: Multiple links between switches

Hello Elmar,

basically, what you need to do is configure an EtherChannel. Let's say you want to connect GigabitEthernet01 and 02 on the 3550 with GigabitEthernet0/1 and 02 on the 2960, you would configure the ports as following:

3550# configure terminal

3550(config)# interface range gigabitethernet0/1 -2

3550(config-if-range)# switchport mode trunk

3550(config-if-range)# switchport trunk encapsulation dot1q

3550(config-if-range)# channel-group 1 mode desirable

3550(config-if-range)# end

2960# configure terminal

2960(config)# interface range gigabitethernet0/1 -2

2960(config-if-range)# switchport mode trunk

2960(config-if-range)# switchport trunk encapsulation dot1q

2960(config-if-range)# channel-group 1 mode desirable

2960(config-if-range)# end

This is the basic configuration, can you try this and see if it works for you ?

Regards,

GNT

Gold

Re: Multiple links between switches

You need configure fastehter channel

check following link

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml

EtherChannel provides full-duplex bandwidth up to 8 Gbps (Gigabit EtherChannel) between your switch and another switch

M.

Hope that helps rate if it does

New Member

Re: Multiple links between switches

Thanks for the fast reply !

I will test this on my switch as soon as I have some spare time. Will also read some more about the etherchannel options.

Regards,

Elmar

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