Cisco Switching/Routing :: Power Stacking For 3750x - Both Cables Needed?
Jun 7, 2012
Suppose I have a 3 member stack of 3750x switches. Members a, b and c.I have all 3 members stacked with all 3 *data* stacking cables in a daisy-chain topology. The 50 cm data stacking cable from switch a (on the very top) to switch c (on the very bottom) just barely reached.Of course, that means the 30 cm *power* stacking cable didn't reach between a & c. Right now, the power stacking cable goes from a to b, and then another cable from b to c. Leaving me with a useless extra 30 cm power stacking cable.
My question is, can switch "a" receive power from switch "c" through switch "b"? Is this just a big electrical "bus"? What if the power supply in switch "b" is removed?Just wondering if there is a need for me to get a longer power stacking cable (one of the 150 cm power stacking cables).
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Dec 27, 2012
I'm trying to get some clarity on power stacking 3750X switches. I have a new stack of 6 switches. I know I can only have 4 in a power stack and all 6 in the data stack with a max of 8. I'm trying to find the proper way to connect the power stack cables for the 4 switch power stack.
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Mar 28, 2012
In my office we bought 7 cisco 3750X - 48PS switches. We configured Data Stacking between those switches. We also want to configure Power Stacking between those 7 devices.
I found in the Data Sheet that we can only configure 4 devices in power stacking at a time. If it is like that how to configure the rest of 3 devices. Need configuring power stacking between those devices in a better way..
power stack cable part no we have is
CAB-SPWR-30CM
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Mar 13, 2013
I have a customer that has a stack of 3750x switches installed in production and now would like to install the powerstack cables. The switches are in production and downtime would like to be avoided. Can you install the powerstack cables with the switches powered up? I would assume you can, but wanted to verify before doing so.
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Jan 1, 2013
There seems to be a lot of conflicting information on what can and can't stack together in the 3750X range.
I know that LAN Base can only stack with other LAN Base switches.
Can IP Base stack with IP services in 3750X? I have also heard that the 15.x.x IOS restricts mixed feature set stacks?
I know that Cisco recommends that all switches in a stack have the same IOS and feature set but having all IP Services in a stack can get too expensive.
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Nov 1, 2012
I have two WS-C3750-48PS-S switches and I need to add two more. The new part number I am looking at is WS-C3750X-48P-S will these all stack together ?
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Apr 22, 2013
I have one 3750X with C3KX-NM-10GT, I need to interconnect using stackwise to 3750G-24TS. The 3750X needs IOS 15.0(1) to use C3KX-NM-10GT, and the latest IOS for 3750G-24TS is 12.2.55. How can I interconnect them using diferent IOS?
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Jan 23, 2013
We currently have a stack of 3750G switches that are running 12.2(46)SE C3750-ADVIPSERVICESK9-M
Our 3750X is currently running 15.0(2)SE C3750E-UNIVERSALK9-M and I believe we were told you can't stack with a Universal IOS image. We have the universal on there because we have some 10GB fiber connections on it that Cisco told us wouldn't work otherwise.
I realize that the switch versions need to match, but the question is, which version should we work off to have use of the 10GB SFP card?
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Oct 3, 2012
can I make the stacking of these two switches WS-C3750E-48PD-SF and WS-C3750X-48PF-L. Both have universal IOS.
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Dec 11, 2012
We purchased a number of 3750X 48 and 24 port switches for the College Campus. Am finally getting around to getting them inserted on the network. Working with a WS-3750X-48PF-S and a WS-3750X-24P-L. Have them stacked with the 10Gb uplink on the 48 port switch. Have not been having fun.In the boot sequence, the switches recognize they are stacked, but as soon as they finish boot, I get the message on the 48 port switch: “Stack Port 1 Switch 1 has changed to state down.” Then “Stack Port 2 Switch1 has changed to state down.” Am noticing that I have a message preceding that: “Major version mismatch with stack neighbor.”The 48 port is running c3750e-universalk9-mz.150-1.SE3, HBOOT 12.2(53r)SE2.The 24 port is running c3750e-unversalk9-mz.122-55.SE3, HBOOT 12.2(53r)SE2Most of our 3750X and older switches are running 122-55 or 122.58 code. IP base or Universal. There is speculation that the problem is the 24 Port is Lan base, as the part number might indicate. (WS-C3750X-24-P-L.... I think that is the part number) and the 48 is IP base. Both switches are Universal, and my understanding is that they don't care about LAN or IP Base until you enable a function that falls in the IP Base domain. Then I have to call Cisco Licensing.For these switches, LAN Base is fine, based on the boot message, I feel the real problem is 122-55 versus 150-1 in the stack. So.. the question is: Do I downgrade the 48 port to match what we have in our environment, and what is on the 24 port switch. Or... Upgrade the 24 port switch to match the 48 port switch and have an installation that is not consistent with our environment? I do have two more edge closets to install with this purchase of 3750X 48 port switches.
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Nov 14, 2011
convergence time in case of stack master will be switched over to other switch.In my understating, when the stack master will be switched over to other switch based on election algorithm, convergence time will be less than 10 second.
I tried to calculate concersion time during fail over testing but convergence time was 21 second. I think it is too long...
Expected reasons
・I configured Rapid Spanning tree protocol between L3 and L3. (But RSTP's convergence time is 2~3 second..)
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May 2, 2013
is it easy to remove the 3750x stacking? i'd like to test one of them on a sunday and keep the other one on production. it's just two stack of 3750x, is it hard and do i really need to remove the cables on the back?
basically i need to put a different config for my testing, i gues i need to remove the cables right? and put it back on the stack before monday.
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Jul 18, 2012
I am trying to stack a 3750g with a 3750x. At the moment they will not stack with their current IOS as the hardware version is mismatched.
According to various posts this is possible as long as the same IOS is in use. The following IOS are currently in use:
3750g - c3750-ipbaselmk9-tar.122-55.SE5
3750x - c3750e-ipbasek9-mz.150-1.SE3
I have tried to downgrade the IOS on the 'X' to 122-55.SE5 however, i get errors regarding firmware incompatibility.
I am unable to upgrade the IOS on the 'G' to 150-1.SE3, as the size of the IOS image is larger than the available flash (Version 15 IOS for the 3750G (c3750-ipbasek9-mz.150-1.SE3.bin) is 16,074,189 bytes whereas the 3750G has 16MB of flash memory or 15,998,976 bytes total which mean the IOS will not fit).
Has not actually stacked these devices successfully? I understand there may be license implications of upgrading to 15 but at the moment I just want them to stack!
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Sep 4, 2012
After stacking two 3750X switches, with four equal power-supply's, with StackWise and PowerStack , still got the next message every few hours %PLATFORM_ENV-1-FRU_PS_ACCESS: FRU Power Supply is not responding (gn4m-rt1p08-04-2)( note that the message revers to the second switch in the stack ) although the stackwise and powerstack on the switches is oke and are working correctly. !
Config : Stack-power in power-sharing mode/strict With CLI on the switch : All the power supply's and stack-power details, prio look OK.
Only: LMS prime /inventory/cisco-view/configure/power supply status result : some power supply's are marked as disabled.with the command > power supply 2 slot a off/on I manage to get the status back to "normal", but after a few hours some power supply's are again marked as "disabled".
Looks like SNMP en IOS difference from opinion.
Hardware
WS-C3750X-24S-S
C3KX-PWR-350WAC
Software
15.0(2)SE
C3750E-UNIVERSALK9-M
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Apr 4, 2012
In a stand alone 3750x switch configuration, can the secondary power supply only act as a redundant power supply (active/standby), or can it become a "pool" of power similar to power sharing mode for StackPower (somewhat active/active)? I understand there is no stack involved here but I'm curious if this functionality is possible.
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Jan 21, 2012
Just received a couple of new 4500e chassis with the 2800ACV power supplies installed. I have not seen the cables they come with standard, the plug ends are considerably thicker than normal, what is the deal, do we need an electrician to come out and rewire or purcahse new powerboards?
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Oct 26, 2011
Does the color strips on C3750X stack power cables mean anything, I mean the green and yellow ones. On all Cisco pictures the green one seems to be plugged in the upper ports. I asked local Cisco representative, but he seems not to be sure. We tried to try different scenarios, and it looks like it does not matter what cable end we use. We do not have any external power supply, only interconnecting C3750Xs.
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May 6, 2012
I have a WS-C3750X-12S-S (IP Services) that I THINK I'd like to downgrade to LAN Base so I can stack it with a WS-C3750X-48T-L that is already LAN Base..
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Mar 21, 2013
I am building a switch stack using 4 48 port 3750X switches that will also have the power stacked. If I install a single 715W power supply in each switch will the stack support 802.3af accross all 48 ports on each switch? My calculations are 48 ports x 15.4W which gives me almost 740W needed which is over hte 715W power supply. I was reading somewhere were it mentioned that in a powerstack additional power can be drawn from the stack. I know this will not work if you are trying to support power on all switches accross all ports but would it if say 2 of the 4 switches are needing to provide PoE accross all 48 ports? If I say we can only use 24 ports per switch for PoE that drops the power need down to 370W which I believe should work. Just trying to get a better understanding of PoE consumption. Would the best solution be to just add a second power supply to each switch?
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Mar 12, 2012
I have two WS-C3750X-48PF-S in stack, but every one has just one power supply. In the package of the switches is included one stack power supply cable.does it make sense to use stack power cable if every switch has just one power supply ??
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Aug 28, 2011
Is the CAB-C15-CBN - Cabinet Jumper Power Cord, 250 VAC 13A, C14-C15 Connector, supported on the Cisco Catalyst 3750X/3560X. I need to plug the switches into a UPS PDU, that requires a C14 plug.
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Jul 11, 2012
Looking at the specs for the 3750 power supply - is the WS-C3750X-48P-S model with the 715W power supply referring to the amount for both power supplies per switch or just one power supply per switch? Meaning, is the 715 a accumulative number or, just the watts of one power supply. I would like to purchase a 3750x PoE switch with redundant power supplies. If this model is not the correct one?give me the model that offers 48 port PoE with redundant power supplies?
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Oct 28, 2012
We have 9 x 3750x switches with 5-nonPOE and 5-POE. There is a limitation with 4 POE per stack with Stack Power.
Can we combine all 9 to one stack since there are only 4 POE?
Or, is the 4-switch limitation applied regardless if they are mixed with POE and non-POE?
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Nov 6, 2012
I have a 3750x 48port POE switch that I installed a second power supply in. But it doesnt power on. Am I supposed to enable it in the switch somewhere? I've plugged it into a couple different outlets so I know that's not the problem.
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Jul 21, 2012
When quoting a Catalyst 3750X with PoE (WS-C3750X-48P-E) the Dynamic Configurator Tool allows to include as the secondary power supply option the Catalyst 3K-X 350W AC Secondary Power Supply (C3KX-PWR-350WAC/2), but the default included primary power supply is the Catalyst 3K-X 715W AC Power Supply (C3KX-PWR-715WAC). My questions are the following:
1. Will this combination of power supply work?
2. Will the C3KX-PWR-350WAC/2 be able to power up the switch if the primary power supply of 715W fails?
3. Will the PoE will be lost if the primary power supply fails and only the secondary power supply of 350W keeps working?
4. If this secondary power supply of 350W is not suitable for PoE, why it is available as a secondary power supply option in the Dynamic Configurator Tool for a PoE switch?
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Oct 31, 2012
I have 3 switches in my 3750 X stack. I am getting the following error in the logs: %PLATFORM_STACKPOWER-4-PRIO_CONFLICT: Switch 1's power stack has conflicting power priorities. Not sure what I should do next. Below is my Stack-power configuration:
Power stack name: Powerstack-1 Stack mode: Power sharing Stack topology: Ring Switch 1: Power budget: 735 Low port priority value: 20 High port priority value: 10 Switch priority value: 2 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: c464.1308.7900 Neighbor on port 2: e8b7.4827.e680
Switch 3: Power budget: 729 Low port priority value: 22 High port priority value: 13 Switch priority value: 4 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd9.9f00 Neighbor on port 2: 2894.0fd8.e200
Switch 2: Power budget: 690 Low port priority value: 21 High port priority value: 12 Switch priority value: 3 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd8.e200 Neighbor on port 2: c464.1308.7900
Each switch has its own 715W power supply in it and all check out OK.
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Feb 2, 2012
We just received two Catalyst 3750X switches. Cisco's documentation provides cabling installs for StackPower in a three or more switch example. Need to clarify the cabling of the two cables between two switches? Having two cables with green and yellow on either side and a switch with both colors signified beside it is a little confusing especially when considering electricity.
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Jun 5, 2013
I am trying to find on Cisco's web site the specification of their power cables for the ASR1002. I am particularly interested in the NEMA specification for the US power cable CAB-AC-RA .
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Jan 2, 2011
I need to configure these qos settings in a C2960S. [code]How I calculate the buffer allocation needed? [code]
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Feb 15, 2012
Our sister site had a new building and the network it was supposed to resemble the network on this site with link redundancy as far as the edge switches.After 6 months asking for the password to the equipment I finaly got it and started to plan the deployment of some phones, I got a little confused as to the layout of what had been done as CDP was not showing what I had expected.
I then used CNA to map out the site.We have 1 main server room (at the top of the picture with the two 4507 cores and a number of fixed config 1U switches)And 3 further wiring rooms at other points in the building with fixed config 1U switches.
(And a wan link to this site)In my opinion the design as it stands is significantly flawed in redundacny with multiple points of failure, and its efficiency is very poor.
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Nov 14, 2012
How to stack a set of these switches with the copper 5G SFP on these switches. We currently have 4 switches stacked with Cat5e jumpers between S1&S2. We want to stop using this stacking method and go to the SFP. What is the best way to do this. Live would be preferable but whatever is the safest method is the way we will proceeed. Any goth'ca's in this process?
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Feb 5, 2012
One of my clients is using Cisco catalyst 2955 industrial switch.I am doing the configuration for them and come across one setting of FCS Error Hysterasis Threshold. I know FCS is Frame Check Sequence.
I do not understand is what is the meaning the setting of Hysteresis in term of percentage stand for what purpose?For example, the default is 10 percent. If I set the value to be lower 5% and what is the impact on that? Is this more stringent than default of 10% or less stringent than default of 10%?
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Oct 8, 2012
i have a strange problem in my campus network.im trying to run port security on my access switches which they are 3550 with ios c3550-ipservicesk9-mz.122-52.SE when i run the port security with Sticky option, even i put 1000 mac address for just learning on the port but when i issue the switchport port-security command every pc connected to that port loses its connection with network UNTIL i enable dhcp snooping!!! all my client are getting they ip address from DHCP server but strange thing is that how on earth i have to enable DHCP snooping to port security work properly? also when i check the configuration under the interface when dhcp snooping is not yet enabled switch doesnt add any mac address under the interface so no one can work until i enable snooping and then switch adds mac addresses under the interface configuration.is this Bug on this version of IOS?[code]
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