Connecting 2960G to 3750

Answered Question
Mar 1st, 2009

New to Cisco so excuse my product ignorance. I'd like to design a network with 3*3750 as the Core/Distribution layer and a number of 2960 as the access layer.

I'm thinking of trunking the 3750s to create one virtual router. I'd like to use 2 uplink ports on each 2960 to connect to different routers to provide

1) increased speed

2) failover in case one router/port fails

Is this possible and briefly, how would it be done? I'm working with a vendor who'll do the actual config.

I have this problem too.
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Correct Answer by Mark Yeates about 7 years 9 months ago

Based on your post it appears you are looking for two things.

Redundancy for your vlans/gateway for user traffic. You will want to use HSRP or a similar function. Here is how to configure HSRP.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/configuration/guide/swhsrp.html

Etherchannel uplinks to the core-distribution/distribution-access layers. For this you will want to configure port channels to utilize multiple links to increase bandwidth, and provide redundancy. Please see the following link to configure these.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/configuration/guide/swethchl.html

HTH,

Mark

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Correct Answer
Mark Yeates Sun, 03/01/2009 - 17:43

Based on your post it appears you are looking for two things.

Redundancy for your vlans/gateway for user traffic. You will want to use HSRP or a similar function. Here is how to configure HSRP.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/configuration/guide/swhsrp.html

Etherchannel uplinks to the core-distribution/distribution-access layers. For this you will want to configure port channels to utilize multiple links to increase bandwidth, and provide redundancy. Please see the following link to configure these.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/configuration/guide/swethchl.html

HTH,

Mark

Ramjet999 Sun, 03/01/2009 - 17:51

Thanks Mark, Your second link illustrates what I want to achieve, esp Figure 30-3, the Cross-Stack EtherChannel.

My use of the term 'virtual' router was incorrect, I actually meant a stack as the illustration shows.

Joseph W. Doherty Mon, 03/02/2009 - 04:02

Besides Cross-Stack EtherChannel, you might still want to run HSRP within your 3750 stack. Reason being, if "master" fails, the gateway MAC might change.

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