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Configure stacking, bundling of ports for C3750X & etherchannel for VMware

Posted on 2012-03-13
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Last Modified: 2012-04-08
2x WS-C3750X-48T Cisco switches stacking config & etherchannel config for VMware
Asked by: sunhux
Pls refer to EE thread id 27593251  where I described the BOM
list of items that I have ie:


2x WS-C3750X-48T-S      Catalyst 3750X 48 Port Data IP Base          
2x C3750X-48-IOS-S-E    C3750X-48 IP Base to IP Services factory IOS Upgrade
2x Included: CAB-STACK-50CM Cisco StackWise 50CM Stacking Cable    
16x GLC-SX-MM=  1000BASE-SX SFP transceiver module for MMF, 850-nm wavelength

I'll need to connect the above two units of WS-C3750X-48T-S (I suppose these
are distribution switches) to a pair of 6500 core switches, so I suppose the 16x
transceivers is distributed such that four pcs of the transceivers go to each of
the C3750X above & four pcs of the transceivers go to each of the 6500 switches
(as I was given 8 pcs of LC-LC fibre cables to link the pair of C3750X to the
 pair of 6500 core switches together).

There's no VSS (Virtual Switching System?) between the pair of 6500 switches.


Q1:
I suppose I can't configure a bundle of 8 fibre connections but 2 pairs of 4
fibre connections since there's no VSS, right?  So how does the configuration
on my C3750X's ports (that has a GLC-SX-MM transceiver inserted into it)
look like if I'm configuring 2 pairs of 4 fibre per pair?  Is it like the following:
  int giga 1/0/x
    spanning-tree portfast
    duplex full
    speed gigabit (or auto-sense?)

Q2:
For stacking between the two C3750X, is it just a matter of joining them
together using stacking cable ie " connect sw1 stack1 to sw2 stack 2,
  sw1 stack2 to sw2 stack 1"  or on the C3750X switches, there's some
 configuration needed or on the stacking ports some config is needed?
 How do those configuration look like?  Pls provide exact sample config
 if any

Q3:
I'm setting up an ESX server which has multiple VMs in it.  Will be
'bundling' or 'aggregating' four gigabit NIC ports on the ESX server
(IBM x3850 & x3650) to the switches.  I suppose for the server,
2 NIC ports will connect to one C3750X switch while the other 2
NIC ports will connect to the other C3750X switch.  I was told I'll
need to configure 'etherchannel' on the C3750X switches.  Pls
provide me with the exact config.  Does the four NIC ports
configured in such a way provide a total 4Gbps or it's just 2Gbps
(ie live/standby pair)?  I was told the switch (or is it the server
hardware?)  needs to support VMware's  "VLAN tagging",  so is
there any specific configuration on the C3750X to provide this
 "VLAN tagging" ?
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Question by:sunhux
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mat1458 earned 500 total points
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Q1:
Yes, correct. It's 2 pairs of 4.

interface range G1/0/49-52
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
interface range G2/0/49-52
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 2 mode active

No need for setting speed and duplex. Portfast on Uplink Ports is not recommended. Use Rapid Spanning Tree if possible.

Q2:
No special config needed, however if you want to know which Switch is the master you can add a priority (default 1):
stack <stack-member-nr> priority 5
look at http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00807811ad.shtml for instructions.

Q3:
The bundling of two or four NIC depends on your NIC teaming configuration. I don't know the IBM servers but that should be part of the configuration.

If the VLAN have to be tagged the config looks like this:

interface range G1/0/1-2 , G2/0/1-2
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 3 mode active

vlan <ESX VLAN-nr>
 name <Name of the ESX VLAN>
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by:sunhux
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Correction to the term "2 pairs"  ==> should read  "2 sets "


Need to clarify further for VMware's etherchannel.  
Suppose I have 2 ESX servers, each ESX server has
4 NIC ports connected to the pair of stacked switches.

So for each ESX server, do I create a separate "Port-Channel"
(say, I call them "Port-channel3"  &  "Port-channel4" for ESX3
 & ESX4  servers) as shown below:

            interface Port-channel3
            switchport trunk encapsulation dot1q
            switchport mode trunk
            switchport trunk native vlan 88
            port-channel load-balance src-dst-ip
            end

            interface Port-channel4
            switchport trunk encapsulation dot1q
            switchport mode trunk
            switchport trunk native vlan 88
            port-channel load-balance src-dst-ip
            end


Then for each port on the switch that’s connected
& grouped for an ESX server, configure as:

            interface GigabitEthernet 0/1, 0/2, 0/49, 0/50
            switchport trunk encapsulation dot1q
            switchport mode trunk
            flowcontrol receive desired
            channel-group 3 mode on
            spanning-tree portfast trunk
            spanning-tree bpdufilter enable
            speed 1000M
            duplex full
            no shut
            exit

 
            interface GigabitEthernet 0/3, 0/4, 0/51, 0/52
            switchport trunk encapsulation dot1q
            switchport mode trunk
            flowcontrol receive desired
            channel-group 4 mode on
            spanning-tree portfast trunk
            spanning-tree bpdufilter enable
            speed 1000M
            duplex full
            no shut
            exit


Correct the configs above if I'm mistaken
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by:sunhux
Comment Utility
Need to clarify the reply for Q1:

interf range G1/0/49-52 <== which physical ports on the 1st 3750X are these ports?
  switchport trunk encapsulation dot1q
  switchport mode trunk
  channel-group 1 mode active
interf range G2/0/49-52 <== which physical ports on the 2nd 3750X are these ports?
  switchport trunk encapsulation dot1q
  switchport mode trunk
  channel-group 2 mode active

For the 1st set of 4 fibre links, can we use 2 fibre links from the first 3750X switch
& the other 2 fibre links from the second 3750X switch?
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Expert Comment

by:mat1458
Comment Utility
Just to answer your question above: in the older 3750 switches the uplink ports were called g1/049, g1/0/50, etc. Since I have not had any 3750x in my hands so far I assumed that Cisco did not change the numbering with the pluggable network modules in the 3750x. However this could be wrong. I you send a show int status i probably can tell you what interfaces I meant.
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