HSRP

kt2003
kt2003 used Ask the Experts™
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Let's say that we have two Cisco switches 3750 and six 2900 and I have to configure three VLANs. What configuration should I implement to achive full redandancy at Layer 2 and also at Layer 3.
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Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Hi,

L2 redundancy:

- You connect two 3750 wirh stack cable to make a cluster
- All other switches connect two ports to 3750_1 and 3750_2
- All switches uplink ports configured to Etherchannel, so the uplink will be 2G

L3 redundancy

- You connect two 3750 wirh stack cable to make a cluster

Best regards,
Istvan

Author

Commented:
Istvan thanks a lot. What is the advantange\disadvantage of having clustring at L3 over HSRP (active/passive)?
 
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
If you clustering the 2 3750 switch will be only one switch!
If your server has 2 NIC you able to make Full redundancy!
In this case better way to clustering, becouse the s swtches able to see each other wirh 32Gps!

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/product_data_sheet0900aecd80371991.html 
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Author

Commented:
Ikalmar. Thank you. I don't have much experience configuring switches so let me ask you one more question. If I configure switch-1 at L3 as active and switch-2 at L3 as passive using HSRP, would this configuration be regarded as clustering?
Head of IT Security Division
Top Expert 2010
Commented:
NO WAY!!!!!!!!!!!!!!!!!!!!

PUT backplane clustering cable, and forget HSRP in this CASE!

Author

Commented:
Thanks
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:

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