LMS and stacking switches

Hi everyone!
I was having a conversation with a friend and he assured that the LMS is stacking switches with up to 09 switches.
Anyone know if this is true? For all I know this is only done through the special interface stack (as in 3750 and 2960S).

LMS (and Cisco Network Assistant) manages Cisco switch stacks. And, yes, a stack is up to 9 switches.
I'm not sure what you're asking, though. Stacks are built by virtue of physically connecting the StackWise cables and that is independent of what, if anything, is used for network management.

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Ciscoworks LMS and 2800 Switch Module Ports

We have a number of 2800 router on our network that have NM-16ESW= 16 port Ethernet modules installed. These are used to connect PCs and phones.
Everytime one of these ports goes down, usually due to a PC being powered down, we receive a critical alert in Ciscoworks.
The ports are configured not to log or send snmp traps.
no logging event link-status
no snmp trap link-status
How can we stop these alerts being generated?

Most likely LMS is polling the interfaces. By default, interfaces that are up when the device was discovered are managed. You can unmanage interfaces by editing the device properties in LMS.

375o switch in stack, only 2nd and 3rd switch reboots

Hi,
In customer place we are having three 3750 switch and it was stacked and working fine. Few days back the in stacked switches 2nd and 3rd switches are rebooted continuously and found in the show version command as: Data TLB Miss Exception (0x1100)!.
From last 4 days we are not found any reboot. Please let us know any software bug is triggered to cause this problem, if upgraded please let us know the image to be put in all the three switches. I am sending the show tech output of all the 3 switches and show stack output.
Thanks in advance.
Regards,
Ram

This URL should help you:
http://www.cisco.com/en/US/products/hw/switches/ps5023/prod_release_note09186a00801b476a.html

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.

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

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
Ankur
"Please rate the post if found useful"

Prime Infrastructure 1.1 LMS and NCS installation.

Dear all
I have purchase below mention product. Now my question is that.
A> 1). Prime (2). LMS 4.2 (2). NCS 1.1 are they different software and has to install them separately ?
B> or The prime is the only virtual(.ova) software where there LMS and NCS works as a feature?
C> Please help me with the download link and installation guide..
CISCO
R-PI-1.1-K9
Cisco Prime Infrastructure 1.1
CISCO
R-PI-1.1-100-K9
Prime Infrastructure 1.1 Software - 100 Device Base Lic
CISCO
L-PILMS42-100
Prime Infrastructure LMS 4.2 - 100 Device Base Lic
CISCO
L-PINCS11-100
Prime Infrastructure NCS 1.1 - 100 Device Base Lic
CISCO
L-PINCSW11-100
Prime Infrastructure NCS WAN 1.1 - 100 Device Base Lic
With Regards
Tanmay
[email protected]

SOme of the similar discussion happened here, which would be helpful.
To answer your questions :
A.> Yes all three of them are separate software.
LMS :--> Ciscoworks Prime LMS is about to be end-of-life software which will phase out in favour of its successor Cisco Prime Infrastructure. This Software was the key application from Cisco to help manage the entire Wired Infrastructure for cisco devices, like Routers, switches, VPN, FW's, etc.
NCS:--> Wireless Control System (WCS) was the LMS equivalent software to manage Cisco's wireless infrastructure. It evolved as a new Generation Network Control System (NCS).
Cisco Prime Infrastructure :--> Cisco felt market demand to have a unified experience to manage both Wired and Wireless Infrastructure, hence Cisco Prime Infrastructure was introduced which is NCS+LMS. Not all features of LMS are migrated, hence customer's are allowed to use LMS latest version 4.2.x for wired network devices, if required.
B.> Prime is now provided with an inbaked Linux kernel to remove dependency from Windows or Unix (Solaris) OS, hence it is only available as OVA deployment image to be used under virtualized environment and can take benefit of virtualized infrastructure.
FOllowing are the download links :
Download LMS 4.2 here
Download PI 2.1 here
-Thanks
Vinod
**Encourage Contributors. RATE Them.**

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

EtherChannel between stacked VSS Catalyst 4500X and Stacked 2960X.

I can have only one link in the EhterChannel up but the 2nd one goes in to suspended mode.
I've tried recreating channel group on different ports but with the same results. Am I doing something wrong or pagp cannot be transmitted over stacks on both ends (I have quite a few EtherChannels but all to single/non-stacked switches)?
2960X stack config
Version: 15.0 (2r)EX
interface TenGigabitEthernet2/0/2
description HR-Link1
switchport mode trunk
switchport nonegotiate
channel-group 2 mode on
interface TenGigabitEthernet1/0/2
description HR-Link2
switchport mode trunk
switchport nonegotiate
channel-group 2 mode on
4500X Stack (VSS) config
Version: 03.04.00.SG (fc3)
interface TenGigabitEthernet1/1/12
description MO-Link1
switchport mode trunk
switchport nonegotiate
shutdown
channel-group 12 mode on
interface TenGigabitEthernet2/1/12
description MO-Link2
switchport mode trunk
switchport nonegotiate
shutdown
channel-group 12 mode on
Thank you,
T

Thanks for reply!
I have tried desirable mode as well but no luck. I can work on this only during the weekend as downtime is not an option.
These two 10G links were just installed last weekend and one patch cable I had to replace due to complete lack of connectivity (small shop so we no fiber testing equipment).
I did not do a lot of troubleshooting last weekend but I will dig in to that this weekend. I was hoping to get some insight from people who work with this on daily basis.
Post from about a year ago got me worried: https://supportforums.cisco.com/discussion/12072281/4500-x-vss-mec-2960-x-stack
Thanks again.
T

6800 Host Ports, Access Clients and Stacking Limitations

In regards to the 6800 Instant Access Solution, it's my understanding that the current OS (Release 15.1(2)SY) will support 1008 host ports across 21 Instant Access clients and that the Instant Access clients will support stacking up to three clients.
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6800ia-switch/white_paper_c11-728265.html
Is there a forecast as to when the client stack size will be increased?

Vzambo,
If you have c6880 or sup 2T you can run newer version 15.2(1)SY. This suuport up to 2000 ports, fabric link 42 and stacking up to 5.
Tony

Etherchannel with stacked switches on 3750

Hi,
i have got cisco 3750 3 Nos. stacked together, below are the config. for etherchannel & the err. msg. i get.
interface gigabit 1/0/25
switchport mode access
channel-group 1 mode desirable
once if i do that, i get "creating a port-channel interface Port-channel 1
interface gigiabit 2/0/25
switchport mode acess
channel-group 1 mode desirable
i get error msg. "%With PAgP enabled, all ports in the Channel should belong to the same switch Command rejected (Port-channel1, Gi2/0/25): Invalid etherchnl mode"
actually if i do that in the same switch i mean 1/0/26,command is accepting. so how to proceed, bcoz i thought i will share the load across 3 switches for etherchanneling.

You cannot use PAgP for etherchannel across seperate 3750's in a stack.
You can set the channel mode to 'on' and it will work or they must come from the same swtich in the stack.
The following is taken from the cat 3750 config guide
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00801cdea1.html#1154336
For cross-stack EtherChannel configurations, disable PAgP and LACP on all ports targeted for the EtherChannel by using the channel-group channel-group-number mode on interface configuration command. Before adding a stack member port to an existing EtherChannel, manually disable PAgP and LACP on all the ports that are members of the channel group, and then manually configure the cross-stack EtherChannel. PAgP and LACP are not supported on cross-stack EtherChannels.
If cross-stack EtherChannel is configured and the switch stack partitions, loops and forwarding misbehaviors can occur.
HTH
N

Performance of stacked switch

I'm installing a stack of 3x 3750G switches, which are inter-connected w/ StackWise cables.
Are stacked switches truely act as one switch w/o any performance penalty if a packet has to traverse from one switch to another in the same stack?
Would it be better to arrange the ports together on the same switch if I know they'll mostly generate local traffice among themselves?
Another question I have is sould I try to distribute ports among the stacked switches as much as possible or is the stack really functioning as a unified stack??
For instance, I've got 3x 24-port 3750G's; thus a total of 72 ports. If I currently have only 24 objects (clients or switches), should I plug 8 in each switch or it doesn't make a difference if I plug all 24 objects into the same switch?

A customer asked me this exact question the other day....
The stack has an interconnect speed of 32G. Thus a packet coming in from 1/0/1 going to 3/0/1 will hit the backplane on switch 1 (speed so high you can forget about it for all intents and purposes) traverse the 32G interconnect bus, across the backplane on switch 3 to the egress port. You can consider this almost identical to the 6500 series when using the "classic" series line cards (61xx series) which likewise share a 32G backplane bus.
I have tested this with IXIA gigabit traffic generators which blasted 20 Gig of traffic with 50000 flows across the switch stack. The boxes were solid as a rock. 20Gig is rather a lot of traffic.... !!!
The only occassion when you might have a problem with this architecture is if you have multi gigabit traffic crossing the switch stack that requires QOS priority on an already heavily utilised stack. In that case you could possibly get contention for the stacking bus (unless there is a way of prioritising the traffic gaining access to the stacking bus???? There hasn't been in the past). Cisco's answer to that would be twofold.
1.If you required such traffic patterns with such heavy traffic and QOS requirements then you should be using a 6500 series switch with high end interface blades.
2.That the 3750 supports ingress QOS to precisely address the problem of overloading the switch fabric.
Best regards,
Steve

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.

ASA Redundant interfaces with stack switches

Hi All,
we have two ASA 5510 connected in failover, and a pair of cisco 2960s switch connected in stack.
Currently one interface of primary ASA is terminated on switch1 and a interface from standby is connected to switch2 as Inside, and switch1 and switch2 are in stack.
for redundancy purpose i want to use multiple interfaces of ASA for inside , so first i thought to use etherchannel , but it has a limitation that , it cannot be terminated on stack switch(as per cisco document http://www.cisco.com/en/US/docs/security/asa/asa91/configuration/general/interface_start.html ).
So my question is :
1. can we use redundant interface feature where 2 physical interfaces combined to a redundant interface (eg interface redundant 1) for inside redundancy purpose.
2. Can these ports from primary/standby ASA terminated on stack switches (2960s), will this work (if the switch with active port goes down, will the other port take over in the redundant interface with the other switch).
I have attached the nw diagram,
Regards,
Ashraf

Hello Ashraf,
1. can we use redundant interface feature where 2 physical interfaces combined to a redundant interface (eg interface redundant 1) for inside redundancy purpose.
Sure, you can. That's the whole purpose of the feature.
2. Can these ports from primary/standby ASA terminated on stack switches (2960s), will this work (if the switch with active port goes down, will the other port take over in the redundant interface with the other switch).
It would make sense if that happens, as the status of the interface will be on a different state than up/up so failover to the other interface will be triggered,
Regards,
Julio

Difference between MARS LMS and IPS

I am trying to understand the difference between MARS, LMS and IPS and why you would use one over the other.
Thank you all.

MARS is an appliance that aggregates/deduplicates syslog and netflow data from routers,switches,firewalls, and IPS sensors. In addition to Cisco devices it also supports things like Checkpoint Firewalls, Snort IPS, etc.
LMS (Ciscoworks LMS) is primarily a device configuration and IOS management platform that runs on your own Windows server (not sure if Unix is still supported.) We use it to maintain the configs of hundreds of Cisco routers and switches, easily push out config changes to said devices, and mass-deploy IOS upgrades.
IPS is sort of like anti-virus "on the wire" - it runs on dedicated IPS sensors, plug-in modules on firewalls or 6500's, and on routers via IOS IPS. Events can be forwarded to MARS for correlation, etc.
You didn't ask, but CSM (Cisco Security Manager) is the more appropriate tool for mass-configuration and 'group policy' for firewalls and IPS sensors.
Each product solves a particular problem; you wouldn't choose one over the other since they all work together to provide a cohesive solution. The specifics of your environment (particularly the number and type of devices) would dictate your choices here.

LMS and stacking switches

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