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Connecting 2 Cisco 3750s 24p X model as redundant core switches and one server switch

Posted on 2013-01-15
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Last Modified: 2013-01-19
I need to connect in stacking the 2  3750s 24 p switches that will act as core switches L3 . These 2 switches will be connected to another 3750 48p X model L2 sw that will act as a servers switch. I would like help for knowing the configuration for the etherchannel port in the server switch and also for connecting the 2 core ones.
What is the best option to connect them ?
coreswitches-proposal-diagram.pdf
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Question by:Apolo Victores
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mat1458 earned 500 total points
ID: 38782165
You use the stacking cables for the tow switches in the core (no GigabitEthernet needed) which make them virtually one switch.

For the EtherChannel towards the server switch you do something like that:

interfaces PortChannel1
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
interface GigabitEthernet1/0/1
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
interface GigabitEthernet2/0/1
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active


On the Server switch it would look like that:

interfaces PortChannel1
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
interface GigabitEthernet1/0/1
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
interface GigabitEthernet1/0/8
 switchport mode trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
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Author Comment

by:Apolo Victores
ID: 38784095
Thanks!, and sorry, one more question regarding to the server switch,
There is a Servers VLAN (Vlan150) so for the rest of the interfaces GigabitEthernet that will go the servers phisically, Do I need to declare the VLAN150? and also assign it in the interfaces configuration? as this?

interface GigabitEthernet1/0/20
 description "Server xxxxx"
 switchport access vlan 150
 switchport mode access
 spanning-tree portfast
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Expert Comment

by:mat1458
ID: 38784949
Looks good. You also need to make sure that the vlan is defined on the switch. This is either already done if you have a VTP server switch on which the VLAN exists. Or you set all switches on which the VLAN needs to be enabled to "vtp mode transparent" and define "vlan 150" and add maybe a name with the next command.
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Author Closing Comment

by:Apolo Victores
ID: 38796980
Thanks somuch!!
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