7 replies to this topic

[rev.research]

Okay, so I have multiple 3750's and would like to "stack" them for the purpose of redundancy.  Any suggestions on how to connect the stackwise cables? :confused:

[wildweaselmi]

When stacking your 3750's, try and keep a full bandwidth configuration (think of a loop that you can travel from top to bottom and have a cable going back to the top)

Here is a photo of FULL BANDWIDTH
http://www.mywiseguys.com/forums/picture.php?albumid=37&pictureid=994&thumb=1

Here is a photo of HALF BANDWIDTH (no redundancy)
http://www.mywiseguys.com/forums/picture.php?albumid=37&pictureid=995&thumb=1

Are you going to have redundant power as well?

[rev.research]

Not sure what you mean. :(

[wildweaselmi]

No worries :cool:

If you utilize the FULL BANDWIDTH configuration for your stackwise cables (note: you'll probably need on long stackwise cable to reach from the bottom to the top) you will have connectivity redundancy in the event one of the switches in the stack fail.

Now, something else that is common to fail is power.  Currently without power redundancy you'll have something like the following
http://www.mywiseguys.com/forums/picture.php?albumid=37&pictureid=993&thumb=1

With a Cisco RPS 675 (which is old and Cisco no longer sells them)
http://www.mywiseguys.com/forums/picture.php?albumid=44&pictureid=996&thumb=1

Or the newer Cisco RPS 2300 (which is the replacement to the 675)
http://www.mywiseguys.com/forums/picture.php?albumid=37&pictureid=891&thumb=1

With an RPS (Redundant Power Supply) with one cable plugged into UPS and the other into WALL power as shown above, you will always have power (until the battery drains)

Check out the YouTube video/advertisement

[rev.research]

Ohh, I see.  I have the stackwise cables but don't have a long cable to connect the bottom to the top so I'll have to get one of those.

How expensive is the redundant power supply and does it come with the DC cables needed to connect the cisco switches together?

[wildweaselmi]

Powering Considerations

Consider the following guidelines before you power on the switches in a stack:

•The sequence in which you initially power on the switches might affect the switch that becomes the stack master.

•If you want a particular switch to become the stack master, power on that switch first. This switch becomes the stack master and remains the stack master until a master re-election is required. After approximately 10 seconds, power on the remaining switches in the stack.

•If you have no preference as to which switch becomes the stack master, power on all the switches in the stack within a 10-second timeframe. These switches participate in the stack master election. Switches powered up after the 10-second timeframe do not participate in the election.

•Power off a switch before you add it to or remove it from an existing switch stack.

As far as RPS price, a google search shows between $600 - $700 and not sure if the DC power cables come with it or not.  I know seperatly they run about $150/each

[rev.research]

Thank You for your help :) , some really good information.

[wildweaselmi]

Basic Initial Configuration

Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(25)SEB2, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by Cisco Systems, Inc. Compiled Wed 08-Jun-05 01:19 by yenanh

Cisco IOS Software, C3750 Software (C3750-ADVIPSERVICESK9-M), Version 12.2(25)SEC2, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by Cisco Systems, Inc.


Would you like to terminate autoinstall? [yes]: no


System Configuration Dialog


Would you like to enter the initial configuration dialog? [yes/no]: yes


At any point you may enter a question mark '?' for help.

Use ctrl-c to abort configuration dialog at any prompt.

Default settings are in square brackets '[]'.


Basic management setup configures only enough connectivity

for management of the system, extended setup will ask you

to configure each interface on the system


Would you like to enter basic management setup? [yes/no]: yes


Configuring global parameters:


Enter host name [Switch]: CAT-3750 *** Note - use Your Standard Naming convention ***


The enable secret is a password used to protect access to

privileged EXEC and configuration modes. This password, after

entered, becomes encrypted in the configuration.


Enter enable secret: switch


The enable password is used when you do not specify an

enable secret password, with some older software versions, and

some boot images.


Enter enable password: packet


The virtual terminal password is used to protect

access to the router over a network interface.


Enter virtual terminal password: terminal


Configure SNMP Network Management? [no]:no 


Current interface summary


Any interface listed with OK? value "NO" does not have a valid configuration


Interface IP-Address OK? Method Status Protocol

Vlan1 unassigned NO unset up down 

FastEthernet1/0/1-48 unassigned YES unset down down 

GigabitEthernet1/0/1-4 unassigned YES unset down down 


Enter interface name used to connect to the

management network from the above interface summary: vlan1


Configuring interface Vlan1:


Configure IP on this interface? [yes]: no


Would you like to enable as a cluster command switch? [yes/no]: no


[0] Go to the IOS command prompt without saving this config.

[1] Return back to the setup without saving this config.

[2] Save this configuration to nvram and exit.


Enter your selection [2]: 2

Building configuration...

[OK]

Use the enabled mode 'configure' command to modify this configuration.


CAT-3750>



--------------------------------------------------------------------------------


Basic Switch Configuration


*****************************************************

***Reorder the switch stack

***Switches should be numbered from 1 – x

***Starting from the top

*****************************************************


CAT-3750#conf t

Enter configuration commands, one per line. End with CNTL/Z.


CAT-3750#switch current-stack-member-number renumber new-stack-member-number 

***Note – Move switches to unused numbers first then back to correct numbers


CAT-3750#end


CAT-3750#reload




*****************************************************

***Set Priority of Switch Master

*****************************************************

CAT-3750#conf t

Enter configuration commands, one per line. End with CNTL/Z.


CAT-3750# switch stack-member-number priority new-priority-number 

***Note – Top switch should be priority 15, each switch down 1 less


CAT-3750#end


*****************************************************

***Base Configuration


CAT-3750#ip routing 


CAT-3750#conf t

Enter configuration commands, one per line. End with CNTL/Z.


CAT-3750(config)#interface vlan 101


CAT-3750(config-if)#no sh


CAT-3750(config-if)#ip address x.x.x.x x.x.x.x 

*** Note – enter the IP address and subnetmask ***


CAT-3750(config-if)#name data_VLAN_101


CAT-3750(config-if)#exit 


CAT-3750(config)#ip default-gateway x.x.x.x 

*** Note – enter the IP address and subnet mask *** 


CAT-3750(config)#no service pad


CAT-3750(config)#service timestamps debug uptime 


CAT-3750(config)#service timestamps log uptime 


CAT-3750(config)#no service password-encryption


CAT-3750(config)#vlan internal allocation policy ascending 


CAT-3750(config)#ip classless 


CAT-3750(config)#ip http server 


CAT-3750(config)#snmp-server community public RO


CAT-3750(config)#snmp-server location sitename 

*** Note - describe the location ***


CAT-3750(config)#ntp server x.x.x.x key 0

*** Note - replace with your ntp server


CAT-3750(config)#ntp server x.x.x.x key 0

*** Note - replace with your ntp server


CAT-3750(config)#ip domain-name something.com


*** Note - replace something with something



CAT-3750(config)#ip name-server x.x.x.x


*** Note - replace with a DNS Server


CAT-3750(config)#ip name-server x.x.x.x


*** Note - replace with a DNS Server


CAT-3750(config)#no file verify auto


CAT-3750(config)#spanning-tree mode pvst 


CAT-3750(config)#spanning-tree extend system-id 



CAT-3750(config)#end


CAT-3750#copy run start


Destination filename [startup-config]?

Building configuration...

[OK]


*****************************************************

***Configure Ports for Access

*****************************************************



CAT-3750#conf t

Enter configuration commands, one per line. End with CNTL/Z.


CAT-3750(config)#int range gig 1/0/1-4 , fa 1/0/1-48 

***Note –enter the range of all ports, except router and etherchannel


CAT-3750(config-if-range)#Switchport Host (this command will configure the basic configuration of the port)

CAT-3750(config-if-range)# switchport access vlan 101


CAT-3750(config-if-range)#exit


CAT-3750(config)#int vlan1


CAT-3750(config-if)#shutdown


CAT-3750(config-if)#end


00:31:06: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively downt


CAT-3750#copy run start


Destination filename [startup-config]?

Building configuration...

[OK]






Ether Channel Switch Configuration


CAT-3750#conf t


CAT-3750(config)#interface Port-channel 1


CAT-3750(config-if)# switchport access vlan 101

CAT-3750(config-if)# switchport trunk native vlan 101

CAT-3750(config-if)# switchport mode dynamic desirable


CAT-3750(config-if)#exit


CAT-3750(config)#int range gigabitEthernet 1/0/1-4


*** Note – Range of ports to use in Channel


CAT-3750(config-if)# switchport access vlan 101

CAT-3750(config-if)# switchport trunk native vlan 101

CAT-3750(config-if)# switchport mode dynamic desirable


CAT-3750(config-if)# channel-group 1 mode desirable


CAT-3750(config-if)# spanning-tree portfast disable



CAT-3750(config-if)#end


CAT-3750#copy run start


Destination filename [startup-config]?

Building configuration...

[OK]