3750 Stack Switch Issue

Hi
I have Stack of 7 3750 Switches. In that Switch 1 is master with 15 Priority and other switches are Member but because of some reason switch 1 rebooted and then Switch 2 becomes Master because it’s having 14 Priority.
We have 2 uplinks which connected on switch 1 (1/1/1) and switch 6 (6/1/1) Tengig port. Also we have 4 AP connected on switch 6.
So we observed that the Switch 1 came up and after that 3 AP is disconnected from WLC. if we disconnect the uplink port on Switch 1 (1/1/1) AP will connect the WLC and using uplink 6/1/1 but if we connect uplink port 1/1/1 and disconnect the uplink port 6/1/1 all 4 AP will disconnect from Network.
We try to connect the Uplink 1/1/1 to Switch 1 other port 1/1/2 but face the same issue. So we reconnect the port 6/1/1 and used the same link which connect on 1/1/1 to switch 7 (7/1/1) and AP will connect on WLC. So as per this troubleshooting we thought some issue with Network Module or Switch of Switch1.
So we Swap the Network module between Switch1 and Switch7 and connect the uplink on 1/1/1 but face the same issue and if we connect the same uplink on Switch 7 Ap connect to WLC.
So we thought that Switch is having issue. But before raising an RMA for Switch we observer 1 more thing that. Earlier that when the Switch 1 is Master all 4 AP's connected to WLC and working fine but when the Switch1 became rebooted and Switch2 became Master issue started. So we rebooted the Switch 2 and make switch master and found that while connecting on port 1/1/1 of Switch port AP's are able to connect to WLC and Issue resolved.
So I wants to know that is there any requirement that If the high priority switch rebooted and after came up it should not be Master then connected uplink will not work.
Also let us know what’s happen if the high priority switch came up in network. Means it’s will became Master or Menber.

Just now i Found one bug which is matching on our issue.
3750x stack fails to update ARP table after reboot causing traffic loss
BUG ID:-CSCtz98066
Symptoms: When the master switch (Switch A) is reloaded or loses power and
rejoins the stack as a member switch, any traffic stream being sent through
Switch A is unable to be received by the destination because the newly joined
member is not able to establish an ARP entry for the next hop router/switch.
Debugs confirm that Switch A does not send a GARP/ARP for the next hop, though
traffic continues to be sent to the switch.
Conditions: The symptom is observed when only Switch A has a physical
connection between the source and destination router/L3 switch. The newly
elected master (Switch B) does not.
Workaround: Ping destination from Switch A, forcing ARP request/response.
Also affected version is 12.2(58)SE and15.0(1)SE2 and we are using IOS 12.2(58)SE.
So we are going to upgrade the devices by this weekend with IOS 15.0(2)SE5.
Will update you once we upgraded the switches.

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Magic number mismatch: bad mzip file in 3750 stack switch

Hi All can anybody help me in this error msg
"magic number mismatch: bad mzip file"
I am trying to upgrade the switch with"c3750e-ipbasek9-tar.122-55.SE5.tar" in 3750 stack switch it is showing this error msg while booting
thanks in advance

Hi,
The reason you are getting this error message on the switch is a corrupt or wrong IOS image "c3750e-ipbasek9-tar.122-55.SE5.tar".
If the switch is in rommon mode, and you have any other image in the switch, boot it using that image. Once the switch is up, download and copy the correct IOS image once again on the switch and try to upgrade.
If you need help in finding the correct IOS image, give me the exact switch model number, i will help you with that.
But forsure the image is wrong or corrupt and that is why you are getting this error.
Thanks
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"Please rate the post if found useful"

Visibility of 3750 Stack Switches on SCH Portal

We have implemented Smart Call Home in one of our customer network. Customer has 34 3750 switches configured in stack. We have done SCH configuration for all 34 devices, problem over here is on SCH portal under “Global Summary Report” only 17 switches are reflecting however in “Device Report” all 34 devices are reflecting.
Can you please confirm/suggest to whom we can coordinate to resolve “Global Summary Report” discrepancy issue.

When a stack boots, each stack of switches determines a master switch. The master switch is the switch handling coordination for all of the other switches in the stack and outside communication.
It looks like the global summary report is reporting only the master switch for the stack. This makes sense to me. All of the other switches in the stack are suppose to be invisible to the outside world and the stack is supposed to operate as a single virtual switch. Since it is a virtual switch, each virtual switch should be counted once as a single entity.
All of the devices in the stack are available for view if you drill down, but from a Smart Call Home view, only the stack master is communicating with Smart Call Home.
But the bottom line is this is only software and can be written differently if it is too confusing to the customer.

Power Redundancy problem for cisco 3750 stack switches

Hi Team,
I have installed and configured cisco 3750X series switches in stackwise. Those are having dual power supply.
Power redundancy test performed:
1. Removed one of the power supply and inserted it back.
2. once the first power supply is ready, removed another power supply and switch got rebooted.
please find the below stack-power output:
JP2-RDC-DIS-02#sh stack-power detail
Power Stack           Stack   Stack    Total   Rsvd    Alloc   Unused Num Num
Name                  Mode    Topolgy Pwr(W) Pwr(W) Pwr(W) Pwr(W) SW   PS
Powerstack-2          SP-PS   Stndaln 700     477     223     0       1    2
Powerstack-1          SP-PS   Stndaln 700     477     223     0       1    2
Power stack name: Powerstack-2
    Stack mode: Power sharing
    Stack topology: Standalone
    Switch 2:
        Power budget: 223
        Power allocated: 223
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 4
        Port 1 status: Not connected
        Port 2 status: Not connected
        Neighbor on port 1: 0000.0000.0000
        Neighbor on port 2: 0000.0000.0000
Power stack name: Powerstack-1
    Stack mode: Power sharing
    Stack topology: Standalone
    Switch 1:
        Power budget: 223
        Power allocated: 223
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 4
        Port 1 status: Not connected
        Port 2 status: Not connected
        Neighbor on port 1: 0000.0000.0000
        Neighbor on port 2: 0000.0000.0000
Can anyone help what went wrong here?
Thanks
Manish

Cosmetic bug
CSCui21029    3750X Stack no standalone stays in running configureation as standalone
Symptom:
When you are configuring a 3750x stack and initially putting it into a stack ring topology by configuring the following.
Switch(config)#stack-power switch 1
Switch(config-switch-stackpower)#sta
Switch(config-switch-stackpower)#no stan
Switch(config-switch-stackpower)#no standalone
You will see that in the running configuration it shows up as standalone mode
stack-power switch 1
switch mode: standalone
stack-power switch 2
switch mode: standalone
Conditions:
3750X stacks with any license level
Workaround:
none

Question Re: connecting 2960C switch to 3750 stack, max number of VLANS limit...

Hypothetical question: Let's suppose for example I've got a 3750 switch stack in a data center with over 300 VLANs defined on the 3750 stack, and that stack is also my VTP domain server. I wish to connect a small compact 2960C switch (which has a max limit of 255 VLIDs) as a VTP client to the 3750 stack's VTP domain and have the port at each end of this uplink connection set up to be an 802.1q trunk, but limit the VLIDs trunked to the 2960 to just a small handful (let's say just 3 or 4 vlans) via for example something like "switchport trunk allowed vlan 1,2,11,18" on the uplink port of the 2960C switch. Will the mere fact that there are hundreds of VLIDs present in the vlan configs on the 3750 stack confuse the little 2960C switch's max 255 vlans limits? Or will the 2960C with its "Lan Base" software happily show all 300+ vlans present in the parent switch stack in a "show vlan" command but simply only let you activate up to the 255 limit locally on that switch?
Normally I'd just use a 3560C switch with IP Base software for this purpose and not worry about any vlan max limit, but we're having to penny-pinch the project and save a few hundred dollars on this compact switch purchase and I've never used the 2960 family before. The small compact switch will be used to host a non-Cisco, 3rd party wireless LAN controller with several APs that will have a handful of different SSIDS, each on a separate vlan, and will not be located in the data center, but in another building connected by a fiberoptic link that will carry the "trunk".
EDIT: I found an old discussion thread where someone else was faced with a similar scenario, and he discovered that even with using "switchport trunk allowed..." and "switchport trunk pruning..." commands on the interfaces at both ends of the link, that the 2960 switch would still fall out of VTP client mode into transparent mode, which make you lose the benefit of having centralized management of a VTP domain. Seems the VTP protocol will always publish the full list of vlans from the server and this blows the mind of the small switches which drop into VTP transparent mode because they cannot handle all that many spanning tree sessions. Looks like the 2960 simply cannot be used in a high-vlan-density network if you wish to preserve central VTP domain management features. Rats.

The house network machine can browse and playback/stream video fine, however at the same time the machine on the wireless shows significant slowdown when browsing the web.
The issue is defiantly on the wireless side, If i plug a machine directly into the switch and assign it a static ip, i do not get slowdown, so this is happening before it reaches the poe switch.
So many factors affect the way to stream data up and down wireless. Sure, I have seen >40 clients on 802.11a AND 802.11b radio of a single 1140 AP. But this is not good. Why? Because wireless is a very "noisy" environment. When one talks, everyone else has to stop, listen and waits for their turn. The > 80 wireless clients connected to the 1140 AP had a detected maximum speed of 11 Mbps and they couldn't get any higher than that. They couldn't get any lower than 11 Mbps because I've disabled lower data rates.
You said you hard-code the channels to 1, 6 and 11 but what is the co-channel interferrence like in your wireless environment?

Connecting LAP1231 using stacked pair of 3750's switch

I am trying to connect my LAP1231 to switch port on stack pair of 3750s that is connected to 6509 switch. When I look at the mac address table of the 6509 switch I don't see the mac address of my LAP. I have the switch port configured on the 3750 to right VLAN and set switchport host as well as switchport mode access. I have 27 other LAP access points connection and this is the only one I am having troubles with. Does anyone know of some issue with stacked 3750-24 switches running 12.2(25r)
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Gary

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Hi,
We are trying to configure Etherchannel between four ports of cisco 3750 stack(2ports from one switch of stack and two ports from another switch of same stack). We are facing issues with this setup. The ports in WS-CBS3012 are going to err disable mode.
Is there any limitations associated with such a cross-stack etherchannel configuration. Please suggest if there is any particular sequence of configuration involved.
Switch1 in stack
int gi 3/0/3
switchport mo trunk
switchport trunk allowed vlan 10-30
sw tr en dot1q
channel-group 1 mode on
spanning-tree guard root
switch 2 in stack
int gi 3/0/3
switchport mode trunk
switchport trunk allowed vlan 10-30
sw tr en dot1q
channel-group 1 mode on
spanning-tree guard root
int port-channel 1
switchport mode trunk
switchport trunk allowed vlan 10-30
sw tr en dot1q
channel-group 1 mode on
spanning-tree guard root
in WS-CBS3012 ports are configured with trunk,allowed vlan and etherchannel configuration with mode on.
With Regards,
Madhan kumar G

Hi,
The commnad "no spanning-tree etherchannel guard misconfig" on WS-CBS3012 resolved the issue.
Regards,
Madhan kumar G

Etherchannel between stack switches[3750] and standalone switch[3560]

Hi,
I have 2*3750 switches in stack as core and 1*3560 switch in access layer. I want to enable ether channel between stack switch[3750A & 3750B] and 3560 switches.
Have connected 2 links from 3560 switch to stack switch, one link to 3750A and other link to 3750B. Will it work in this way as per my requirement?
or i should enabled stacking on 3560 switch too and configure cross-stack ether channel between 3750 stack and 3560 stack. i refered few cisco documents, but the cross stack etherchannel configuration example has 3750 at both end stacks.
Rgds...
VikramS

Hi,
This should work fine as per you set up, the 3750 stack will be acting as one switch, which means that the ether-channel configuration should be straight forward. There is no need to stack the 3560 for this to work, also the 3560 are not stackable.
Hope this helps.

Question about 3750 stack

Hi,
I have 3 3750 switches: WS-C3750G-12S-S, WS-C3750G-16TD, WS-C3750G-16TD.
They are connected via Stack Cable in half-duplex mode.
I have a 10GE module(X2-10GB-LR=) on WS-C3750G-16TD.
the bandwidth of the logical switch should be 32Gbps. My question is about oversubscribe. totally there are 44 Giga ports. how these 44 Giga ports and 1 10Giga port share this 32Gbps? And what's mean half-duplex for stack mode?
Thank you very much.
Regards,
Sha

Hello Sha,
this might not directly answer your question, but the way I understand the StackWise technology is that the switches in the stack form a logical ring, with a maximum backplane throughput of 32Gbps, as you already said. Each packet on each switch is load-balanced across the ring. The ring/backplane supports 32Gbps max, if you have more ingress bandwidth than that, the 32Gbps will still be the limit.
I found this article, which explains some of the issues, you might want to have a look at it:
Cisco Catalyst 3750 stackable switches
http://www.networkworld.com/reviews/2003/0811revcisco.html
HTH,
GP

3750-48/3750-12s compatibility issue

Has any one ever seen a problem like the following?
We have a stacked pair of 3750-48s (SMI) ether-channeled to a stacked paire of 3750-12s switches (EMI). The channeled ports are each on separate switches within their respective stacks.
Everything is woring fine. We power down one of the 3740-12s and we lose 1 ping across the etherchannel (works perfect). Howver, when we first power back up the 3750-12, and I mean within a couple of seconds the link light comes on on the 3750-48 that it connects to and the 3750-48 thinks the channels is back up. We begin loosing pings until the 12s is fully powered up. Seems like a bug to me. We are running 12.2.25 Code. I'm in the process of opening a TAC case but just Thought I'd toss it out here.
Also, we removed the stack configuration and Etherchannel and just connected one 48-port switch to one 12-port switch. The same issue happened. As soon as we powered up the 3750-12s the link light on the 48port comes up ( 2 seconds tops).

Hi,
I have seen similar between 3750's with Etherchannelled uplinks to 6509 switches
It turned out to be a bug with running different versions of spanning tree between both sets of switches.
I think the 3750's were running PVST+ and the 6509's were running RSPT.
This was diagnosed by a Cisco consultancy, when one of the Etherchannel links was dropped, it caused EIGRP to reconverge and all sorts of timeouts occured for a while. Unfortunately i haven't had time to test it since the changes were made but i know the consultancy reproduced this issue in their lab which resulted in them hardcoding both sets of switches to PVST+
Have a look and see if this could be the same for you.
Rgds
PJD

Sg-300 - 3750 stack with SPANNING-TREE root problem.

Morning. I think ive configured a few hundred switches, maybe a thousand in my time, but never have a faced such horribleness that is the SG-300. After this week, I think ill refuse to touch them.
Got 2 voice vlans and running a few vrf's on a 3750 stack. but this discussion is about layer 2.
2 x 3750 stacked
1 x voice switch sg-300 company A voice vlan 18 - Po1 up to 3750 distributed etherchannel Po1 (LACP active both sides) 2 ports in channel
1 x voice switch sg-300 company B voice vlan 19 - Po1 up to 3750 distributed etherchannel Po2 (LACP active both sides) 2 ports in channel
Allowed vlans on both sides (command on Port-channel) are data A, Voice A, Mgt A to switch A
Allowed vlans on both sides (command on Port-channel) are data B, Voice B, Mgt B to switch B
It seems that these switches are limited to one voice vlan....
and that spanning tree BPDU's are ignored (or not recevied- havnt released the shark yet). let me explain.
originally when using "smart port" the switch with the lowest mac address, whatever Voice vlan was configured would take over the other switche's voice vlan, argh what a nightmare.
I gave up on the GUI as its far to complcated and have Almost got this working.
I am now using auto voice vlan, but have disabled smart macro. I hope that disabling smart macro stop other switches from learning the switch with the lowest mac address's voice vlan. So far so good - in the LAB. No where was it documented in the cli guide how do disable this stupid feature.
DHCP is working from scope on core, can mange the switches etc etc, access vlan voice vlan all good (after a monster battle).
Now I have an issue with spanning tree.
spanning tree priority for vlans 1-4094 on the 3750 is 4096.
spanning tree priority for vlans 1-4094 on the SG-300's is 6xxxx.
ALL switches think that they are the root. (well the "logical" 3 of them) The 3750's for all vlans, and the SG-300 for the one instance as it doesnt support per vlan. (I am not interested in trying MST here..this is not a datacentre)
On the 3750's Ive tried ieee, pvst, rpvst, while matching the non per-vlan equivalent on the SG series.
What is the difference between a General port and Trunk Port on a SG-300 specific to spanning tree, native vlans (when you can just configure an untagged vlan anyway!!) and what is the relevance to the way the bpdu's are carried?
And why the need for a PVID, when you can tell a port what is tagged and what isnt.
Does the trunk need Vlan1 to be explicitly allowed, and untagged? Does the Po trunk need to be a general port with PVID configured? in vlan 1?
I need to sort this, as cannot put an access switch into production that thinks it is the root of the tree. I wish I had a 2960.... a 3500XL..anything
Does anyone have CLI commands that can help here?

F.Y.I for catylyst heroes - here is the equivalent config for SG-300 - Vlan1 is required on the allowed list on the catylyst side (3xxx/4xxx/6xxx)
In this example:
VLANS - Voice on 188, data on 57, management on 56.
conf t
hostname XXX-VOICE-SWXX
no passwords complexity enable
username xxxx priv 15 password XXXXX
enable password xxxxxx
ip ssh server
ip telnet server
crypto key generate rsa
macro auto disabled
voice vlan state auto-enabled !(otherwise one switch controls your voice vlan….)
vlan 56,57,188
voice vlan id 188
int vlan 56
ip address 10.230.56.12 255.255.255.0
int vlan1
no ip add dhcp
ip default-gateway 10.230.56.1
interface range GE1 - 2
switchport mode trunk
channel-group 1 mode auto
int range fa1 - 24
switchport mode trunk
switchport trunk allowed vlan add 188
switchport trunk native vlan 57
qos advanced
qos advanced ports-trusted
exit
int Po1
switchport trunk allowed vlan add 56,57,188
switchport trunk native vlan 1
do sh interfaces switchport po1
!CATYLYST SIDE
!Must Explicitly allow VLan1, this is not normal for catalysts - or spanning tree will not work ! Even though it’s the native vlan on both sides.
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,56,57,189
switchport mode trunk

L2 stack switch - to end-user devices

Hi all,
I came across a design in my project today and realize that there are 3 x L2 stack switches which will be connecting to end-user computers.
According to the client, for end-user devices, he intend to just connect 1device/interface.
Q1) I am wondering, in this design, the only intention is to increase the number of interfaces/ports , am i right ? as there is only 1 physical cable for each connected device.
==========================================================================================
In the same design, there is 2 x L3 switches which are meant for core network connecting to servers computers. They are stacked as well.
In this case, etherchannels are configured on the switches and servers which the 2 interfaces in 1 server are connecting to separate switches' interface in the stack.
Q2) Can I check, for this kind of switch stacking setup, are the etherchannels configure as active, active or it can be configure as active,passive ? or it is switches and servers dependable ?
Regards,
Noob

Hi Reza,
Thanks for the reply.
Q1) I am wondering, in this design, the only intention is to increase the number of interfaces/ports , am i right ? as there is only 1 physical cable for each connected device.
That is correct. The end devices (printers, PCs, laptops) usually have one physical cable and you can only connect them to one switch, but sometimes for mission critical environments engineers deploy multiple switches in case one of them goes out for any reason.
What if in the event that 1 of the switch go down, as the switches are stacked, can i just plug out the cable @ interface let's say at switch1 fe0/1 and insert it into switch2 fe0/1 ? (provided it is not occupied)
Q2) Can I check, for this kind of switch stacking setup, are the etherchannels configure as active, active or it can be configure as active,passive ? or it is switches and servers dependable ?
If you issue "sh etherca summay" on the stack, it will show you the port number that are part of that etherchannel. As for active or passive, usually the switch is configured as active and servers as passive but you can also configure both sides as active.
Do you mean on the server side, only 1 port will be receiving/sending information, but on the switch side, each interface at each of the 2 switches is able to receive/send ?
Regards,
Noob

Re: Cat 3750 Stack Management

Hello,
I am building a few 3750 stacks with three or more units, I want to be able to poll/monitor each individual switch in the stack but as it only has 1 ip associated with the stack, how can I do this? I am blind to a switch going down in the middle of the stack. I saw this in a four-year-old forum, but I say no specific resolution.

All stack management happens through the commander. The stack looks like a huge switch. If you want to monitor a specific switch's interfaces you can. They will be numbered as *EthernetX/0/Y, where X is the stack member number and Y is the interface number. CPU utilization can only be monitored on the active stack master, though. Inventory can be obtained from each stack member using ENTITY-MIB. Environmental data can be obtained for each switch using the CISCO-ENVMON-MIB.

3750 stack won't sync with NTP server

Any help greatly appreciated with this one - I can't for the life of me figure out what's going wrong here.
I'm working on a 3750 stack in Singapore (UTC +8) and I'm trying to get it to sync its clock with 3.sg.pool.ntp.org.
This is the weird part - "sh ntp associations" shows that it is syncing:
address         ref clock       st   when   poll reach delay offset   disp
*~199.195.193.200 203.117.180.36   2     52     64   377 80.936 -13895. 1.771
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
And "sh ntp associations de" shows that it's happy:
199.195.193.200 configured, our_master, sane, valid, stratum 2
ref ID 203.117.180.36, time D691F63E.C4B691CD (17:26:22.768 UTC Tue Jan 28 2014)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 196.39 msec, root disp 592.71, reach 377, sync dist 944.69
delay 80.93 msec, offset -13895.2686 msec, dispersion 2.65
precision 2**20, version 4
org time D691FA8F.5FF29003 (17:44:47.374 UTC Tue Jan 28 2014)
rec time D691FA9D.5041E9C7 (17:45:01.313 UTC Tue Jan 28 2014)
xmt time D691FA9D.3B3524C8 (17:45:01.231 UTC Tue Jan 28 2014)
filtdelay =    82.20   80.93   82.17   81.49 155.78   81.08   84.67   82.09
filtoffset = -13897. -13895. -13899. -13900. -13901. -13872. -13876. -13876.
filterror =     0.00    0.99    1.98    2.94    3.94    4.92    5.87    6.81
minpoll = 6, maxpoll = 10
But the clock is stubbornly remaining unsynchronised ("sh ntp st"):
Clock is unsynchronized, stratum 16, reference is 199.195.193.20
nominal freq is 119.2092 Hz, actual freq is 119.2092 Hz, precision is 2**17
reference time is 00000000.00000000 (08:00:00.000 UTC Mon Jan 1 1900)
clock offset is -13895.2686 msec, root delay is 0.00 msec
root dispersion is 14.62 msec, peer dispersion is 3.26 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000000000 s/s
system poll interval is 64, never updated.
NTP-relevant config is as follows (no ACLs, outbound UDP 123 allowed on perimeter firewall):
clock timezone UTC 8 0
ntp server 3.sg.pool.ntp.org
I have configured a pair of stacks in Hong Kong for NTP (though that was a couple of months ago and I recall that those were a pain at the time as well) and those are working fine.

Much to my annoyance, the switch stack is now synchronised. No configuration changes were made in the interim; it just looks like it needed a long time (well over an hour in this case) to start syncing properly.

What is a stacked switch?

Hi,
Can anyone explain what is a stacked switch and what kind of switches can be stacked and why the switched need to be stacked and how they work.
Any links that I can go through to get the details.
Thanks in Advance,
Shyam

Hi
When you talk about stacking the cisco switches, there are two techniques
gigastack :- In this you connect all the switches uplink with gigabit stack GBIC.
guru prasad has given one cisco url for that.
and all the switches that support stackwise technology are now end of sale.
stackwise and stackwise plus :-
Cisco StackWise technology unites up to nine individual Cisco Catalyst 3750 switches into a single logical unit, using special stack interconnect cables and stacking software. The stack behaves as a single switching unit that is managed by a master switch elected from one of the member switches. The master switch automatically creates and updates all the switching and optional routing tables. A working stack can accept new members or delete old ones without service interruption.
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_white_paper09186a00801b096a.shtml
now we can say that we have only one stacking option available that is of stackwise as all model which supported gigstack are now end os sale.
HTH
rate if it helped
rgds
rajat

3750 Stack Switch Issue

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