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New Member

Connect two Switches

Greetings,

I'm relatively new to Cisco networking and very eager to learn everything I can.

Currently the company I work for is undergoing a remodel and expansion. The office building I am in has opened a suite on another floor so employees who are displaced can work there. On my main floor I have a huge Catalyst 4507R with a WS-X4506-GB-T blade in it. I would like to temporarily connect a Catalyst 3750G to it so the people on the other floor have network connectivity. From what I have learning a trunked line can be set up on two ports so the traffic from the 3750G can work with the 4507R. I have a basic setup on the 3750G but when I connect it to the 4507R I get this...

Dec 18 00:14:16.181: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up

Dec 18 00:14:18.622: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down

Dec 18 00:14:48.008: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up

Dec 18 00:14:50.742: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down

Dec 18 00:15:20.220: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up

Dec 18 00:15:22.820: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down

Is this going to be with the 3750g or the 4507R? Do I need a crossover cable in between the swicthes? I get mixed answers some say yes some say no.

Any suggestions would be greatly appreciated....

Thanks

6 REPLIES
Hall of Fame Super Blue

Connect two Switches

Dale

So you are using an RJ45 cable and not a fibre cable ?

Can you post the config of both ports used for the connection ?

Also you need to be aware of VTP issues, so can you post "sh vtp status" from both switches as well ?

Jon

New Member

Connect two Switches

I do have a CAT6 RJ45 cable ran between the floors. It is not a crossover setup but a regular typeA Ethernet cable.  I currently have a small 5port unmanaged Natgear giga-switch up there and it is working fine. But I will need more ports. Probably 10-15 total but not all at the same time running.

I thought I screwed something up on the 3750G so I did a Write Erase and reload in it. I'm reprogramming it now now with a basic setup, VLAN1 all ports in VLAN1 and port 1 will be my link to the other. I'm getting access to the 4507R here shortly (red tape - egos in play) and will post that port's config ASAP.

I know I'm going to to need to get one port on the 4507 set up for truncating. I was told it would be automatic on the larger switch but it seems not the case.

Thanks

Hall of Fame Super Blue

Connect two Switches

Dale

It won't be automatic if the port has not been configured as a trunk.

You only need a trunk if you have multiple vlans on the 4500 and you need those on the 3750. It depends on the existing config so it's difficult to help without seeing it, but you do need to be careful with VTP. It is unlikely, but there is a chance that when you connect the 2 together theh 3750 could overwrite the vlans on the 4500 which would not be good.

So can you post outputs requested plus a "sh vlan brief" from the 4500 ?

Jon

New Member

Connect two Switches

Yes Sir... 

Very concerned about VTP....   Will not do much until I can get access to the other switch.. Thanks!

Hall of Fame Super Blue

Connect two Switches

Dale

Don't worry too much about VTP, it is unlikely but something to be aware of just in case.

Jon

New Member

Connect two Switches

Update:

I'm up and running...  I was able to get into the other switch and set a port up for trunking. Working fine.

Thanks for your help!!!

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