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stacking Catalyst 3650

Posted on 2016-12-01
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Last Modified: 2016-12-08
I posted a simiular question before but now I have model numbers. How should I stack my 3x 3650's? Is this setup OK ? This will be going to another stack on a different floor. Should I configure an IP for each switch? Should I have trunks going to the first stack from each of the 3 switches? Anything I need to know, anything I'm missing?

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Question by:Shark Attack
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Expert Comment

by:Predrag Jovic
ID: 41909355
Setup is OK.
Should I configure an IP for each switch?
No
Should I have trunks going to the first stack from each of the 3 switches?
Not sure what you are asking. But, if I understand what you are asking - No. When switches are in stack you will actually have switches marked as 3 slots. (I guess you have stacking modules).
Gi1/0/1 - 2 - 3 etc
Gi2/0/1 - 2 - 3 etc
Gi3/0/1 - 2 - 3 etc
3 switches will actually become one switch.

Catalyst 3750-X and 3560-X Switch Software Configuration Guide - Managing Switch Stacks
Cisco Catalyst 3750-X and 3560-X Series Switches FAQ
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by:Shark Attack
ID: 41909362
sorry for not being clear. I will have two sets of stacks. one on floor 1 and the 2nd on floor 2. The pic is of the stack 2. I will need a trunk between the two stacks.

So I should not configure any IP for the switch 2 or 3 ?
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Expert Comment

by:Predrag Jovic
ID: 41909370
So I should not configure any IP for the switch 2 or 3 ?
No. Just stack Master have IP address.
I will need a trunk between the two stacks.
If you plan to create etherchannel between switches on 1 and 2 floor than it is recommended to create etherchannel with ports from 2 different stack members for better resiliency. (for example Gi2/0/49 & Gi3/0/49)
If you have just one uplink it does not really matter.
Commands start with
# switch ....
# show switch
You have more details on link above - managing switch stacks.
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Author Comment

by:Shark Attack
ID: 41909380
definitely, that makes sense. I will have ether-channels. I will use all switches. Thanks!
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Expert Comment

by:Predrag Jovic
ID: 41909387
Number of etherchanne links:
Bundle links in numbers 2, 4, 8.
You can even configure 3 links in etherchannel and configure max number of links in etherchannel.
interface po1
 lacp max-bundle 2

Why 2, 4, 8 ? - Understanding EtherChannel Load Balancing and Redundancy on Catalyst Switches
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Author Comment

by:Shark Attack
ID: 41909393
what do you mean by 2 4 8 ?
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Expert Comment

by:Predrag Jovic
ID: 41909394
2 link
4 link
8 links
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Author Comment

by:Shark Attack
ID: 41909396
So,

STACK 1                            STACK 2
SW1                                   SW1     - 2 links between SW1's
SW2                                   SW2    - 4 links between SW2's
SW3                                   SW3    - 8 links between 3s
SW4

thats what you mean ?
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Predrag Jovic earned 500 total points
ID: 41909401
2 interfaces in bundle:
**************************************
interface po1
!
interface range gi1/0/49, 2/0/49
 channel-group 1 mode active
!
**************************************

4 interfaces in bundle:
**************************************
interface po1
!
interface range gi1/0/49, 2/0/49-50, 3/0/49
 channel-group 1 mode active
!
**************************************

8 interfaces in bundle:
**************************************
interface po1
!
interface range gi1/0/49 - 50, 2/0/49 - 51, 3/0/49 - 51
 channel-group 1 mode active
!
**************************************

Any 2, 4 or 8 interfaces, not necessary those.
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Author Comment

by:Shark Attack
ID: 41909403
oh i see, got it, thanks
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Expert Comment

by:Predrag Jovic
ID: 41909410
You're welcome.
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Author Comment

by:Shark Attack
ID: 41918182
did you mean to name the channel-groups 1's? probably not since you can only have 8 in a bundle.
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Expert Comment

by:Predrag Jovic
ID: 41918303
To each ehterchannel you need to assign different number. If you need to have 2 etherchannels on one device, sure you need to have different numbers (e.g Po1 and Po2). You can use the same numbers on every switch if you want, numbers are locally significan (only on switch itself), does not have to match to the number on the other switch.
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Author Comment

by:Shark Attack
ID: 41918322
so if I create etherchannels po1 po2 and po3 from the floor 1 stack i will need three trunks to the stack 2 on the Floor 2, right? there is no other way i can do this
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Expert Comment

by:Predrag Jovic
ID: 41918332
so if I create etherchannels po1 po2 and po3 from the floor 1 stack i will need three trunks to the stack 2 on the Floor 2, right?
Why would you create 3 ethechannels between 2 switches?
Create just one. Take 4 interfaces from stack and bundle it into port channel, that's it.
Do the same on the neighbor device and connect those two together.

How many interfaces you want to bundle into etherchannel?
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Author Comment

by:Shark Attack
ID: 41918341
you mentioned, 2, 4 and 8 bundles each from stack 1 (one logical switch) that's three bundles all together since I can't bundle more then 8 links together. So I will have 3 port-channels on stack 1  and I need to connect that to stack 2 on floor 1.
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Author Comment

by:Shark Attack
ID: 41918348
unless you meant to pick 2, 4 or 8 and create one ether-channel
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Expert Comment

by:Predrag Jovic
ID: 41918349
From one stack to other stack create just one etherchannel per switch.

I was taking that you should create stack with 2 OR 4 OR 8 interfaces. Meaning was NOT TO create etherchannel with for example 3 interface (or 5 etc). Please read Cisco article on one of previous posts for detailed explanation why not to create bundle of 3 interface in etherchannel.
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Expert Comment

by:Predrag Jovic
ID: 41918350
That's exactly what I meant.
:)
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Author Comment

by:Shark Attack
ID: 41918352
ok, thats what I was confused about. and trunk across the stacks and that should do it
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