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How do you physically connect two Cisco 3750G switches in a redundant cross-stack?

Posted on 2011-09-16
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Last Modified: 2012-05-12
Hello,

I am setting up an etherchannel  link for NetApp FAS2020 appliance in Dynamic mode VIF. The documentation says that the switches must be configured in a cross-stack etherchannel.

Question
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1, I have the two cisco switches above with cross-stack cables. How do I connect them to be a fully redundant cross-stack with the cables? Each switch has ports at the back labeled stack 1 and stack 2.

2, How do I configure which switch will be the master of the stack?



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Question by:darkoaddison
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rog2054 earned 500 total points
ID: 36548853
Run one stack cable from SWITCH1-stackport1, to SWITCH2-stackport2.
Run another stack cable from SWTICH2-stackport1, to SWITCH1-stackport2.

To see the status of the stack (including which is master): SW# show switch

To change which is master: SW(conf)# switch 1 priiority n
where n is the priority. 15 is highest, so easiest to set your preferred stack master to 15

The ports on the stack members will be as follows:
SWITCH1 ports will be gi1/0/1 - 1/0/48
SWITCH2 ports will be gi2/0/1 - 1/0/48
etc

You can access the 'stack' for config via either console port (on Switch1 or Switch2).
- essentially the stack operates as if it were one 96 port switch (with a shared/common ARP table, etc)

When connecting dual-nic devices - servers, etc, connect 1 nic to each switch, so that if a switch fails the other connection remains up (compared to connecting both server nics to the same switch).
- Same logic for SANs, uplinks, etc - providing the uplink device can do some sort of teaming...

Hope this helps
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by:darkoaddison
ID: 36549225
Hi rog 2054,

Thank you for the answer. I must say this is a very and concise clear one.  
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Expert Comment

by:rog2054
ID: 36568115
Thanks for the feedback.

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Expert Comment

by:rog2054
ID: 36904908
Edit, i'm sure you've realised by now, but there was a typo in my answer (sorry)
SWITCH2 ports will be gi2/0/1 - 1/0/48

should be
SWITCH2 ports will be gi2/0/1 - 2/0/48
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