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

Similar Messages

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.

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

UCS can not use etherchannel with cisco switch

On catalyst switch 3560x
interface Port-channel5
description Uplink-UCS-VM1
switchport mode acc
switch access vlan 1
interface range giga0/23-24
switch access vlan 1
channel-group 5 mode on
==============================
On UCS
via pic

Hello ,
I assume you are following KB articles for ESXi configuration.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004048
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004088
From 3560, " show etherchannel summary "
Can you please share the output of following commands from ESXi host ?
esxcfg-nics -l
esxcfg-vswitch -l
Padma

Challenge: Spanning Tree Control Between 2 links from Switch DELL M6220 to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy)

Hello,
I have an Spanning tree problem when i conect 2 links from Switch DELL M6220 (there are blades to virtual machines too) to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy, with one IP of management)
In dell virtual machine is Spanning tree rapid stp, and in 3750 is Spanning tree mode pvst, cisco says that this is not important, only is longer time to create the tree.
I dont know but do you like this solutions i want to try on sunday?:
Could Spanning tree needs to work to send one native vlan to negociate the bdpus? switchport trunk native vlan 250
Is it better to put spanning-tree guard root in both 3750 in the ports to mitigate DELL to be root in Spanning Tree?
Is it better to put spanning- tree port-priority in the ports of Swicht Dell?
¿could you help me to control the root? ¿Do you think its better another solution? thanks!
CONFIG WITH PROBLEM
======================
3750: (the 2 ports are of 2 switches 3750s conected with a stack cable, in a show run you can see this)
interface GigabitEthernet2/0/28
description VIRTUAL SNMP2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
logging event trunk-status
shutdown
interface GigabitEthernet1/0/43
description VIRTUAL SNMP1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
shutdown
DELL M6220: (its only one swith)
interface Gi3/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit
interface Gi4/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit

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

Can I Stack Switches with differents Part Numbers? Is it possible??

Hi,
I have a doubt, I need to buy 4 Switches Cisco 3750-X, but 2 with UTP/RJ-45 Ports, and 2 with STP capability.
My question is, for example, Can I stack 2 WS-C3750X-48T-E and 2 WS-C3750X-24S-E??

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
The only limitation of stacking different 3750X models is the feature set of the installed IOS.
I.e.: "The Cisco Catalyst 3750-X Series Switches with LAN Base feature set can only stack with other Cisco Catalyst 3750‑X Series LAN Base switches. A mixed stack of LAN Base switch with IP Base or IP Services features set is not supported."

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"

C3750G IP BASE upgrade to IP SERVICE with stacking four switches

Dears
Existing i have 4 x C3750G IP BASE with stacking, now need upgrade to IP service for BGP support.
Order from reseller PN: CD-3750G=EMI=.
I want ask need purchasing 4 x "CD-3750G=EMI=" or just purchasing 1 only for 4 x switches. I checked Cisco supportforums C3750G not support license activation.
Many Thanks
Wong

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
My understanding has been the 3750 series will allow you to (legally) run a whole stack with an IPServices image as long as one stack member has a license for IPServices.
For redundancy, you should have at least two stack members with IPServices, otherwise if the sole IPServices master fails, the whole stack reverts to IPBase.

N7k as redundant core with vpc to 4510/3750 as distribution switch

Hi - basic question here
Got 2 qty N7k as redundant core with vpc to 4510 and 3750 as redundand distribution switch running MST. I got stuck with some bad cabling design from our IDF to Datacenter so have 2 access switch whereby each one will have a etherchannel to both distribution 4510 and 3750. My question is this is a doable design as I am not sure about the vpc upstream on how it effects etherchannel with MST for my distribution and access.
Thanks

vPC will be considered as one logical link by both upstream and downstream connected devices
the question here are you going to run L3 between the distribution and Core devices ? ( this is recommended design ) if yes, then you do not need to worry about MST and VPC if you going to have it L3 from distribution devices up to the Core
one thing to consider is the distribution switch in your design has big difference in terms of backplane throughput i mean between the 4500 and 3750 !
if you can have both as 4500 will be better and more consistent design
Good luck
if helpful Rate

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)
Thanks,
Gary

After I sent sumitted the posting I found my problem. I had added a VLAN list to the interface and forgotten I had done this. Once I added the VLAN to the list everything worked as advertised. Thanks for the response.
Gary

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.

Use SNMP to monitor the power supply status of stacked switches

Does anybody know how to use SNMP to monitor the status of the internal power supplies of a group of stacked Cisco 3750 switches?
The switch stack has three 3750-48PS-E switches inter-connected by Cisco StackWise cable. IOS ver 12.1(19)EAlc. A single IP address is used to identify the switch stack. Every time I poll the OID chassisPs1Status (1.3.6.1.4.1.9.5.1.2.4.0 in CISCO-STACK-MIB), I only got the status for the Master switch of the switch stack. Is there any way to poll the power supply status of other switches in the switch stack?
Thanks a lot!

Sorry to refresh such an old topic - but I am stuck with exactly this: Monitoring power supplies of a stacked Cisco Catalyst 3750-E.
I'm using the exact same OID's as described, but the problem is, the information shown on the SNMP output is not correct.
This morning, a power supply of the first switch failed and switched to RPS. Here the information I got on SNMP:
snmpwalk -v 2c -c public 192.168.1.50 1.3.6.1.4.1.9.9.13.1
SNMPv2-SMI::enterprises.9.9.13.1.1.0 = INTEGER: 13
SNMPv2-SMI::enterprises.9.9.13.1.3.1.2.1006 = STRING: "SW#1, Sensor#1, GREEN "
SNMPv2-SMI::enterprises.9.9.13.1.3.1.2.2006 = STRING: "SW#2, Sensor#1, GREEN "
SNMPv2-SMI::enterprises.9.9.13.1.3.1.3.1006 = Gauge32: 41
SNMPv2-SMI::enterprises.9.9.13.1.3.1.3.2006 = Gauge32: 40
SNMPv2-SMI::enterprises.9.9.13.1.3.1.4.1006 = INTEGER: 59
SNMPv2-SMI::enterprises.9.9.13.1.3.1.4.2006 = INTEGER: 59
SNMPv2-SMI::enterprises.9.9.13.1.3.1.5.1006 = INTEGER: 0
SNMPv2-SMI::enterprises.9.9.13.1.3.1.5.2006 = INTEGER: 0
SNMPv2-SMI::enterprises.9.9.13.1.3.1.6.1006 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.3.1.6.2006 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.4.1.2.1060 = STRING: "Switch#1, Fan#1"
SNMPv2-SMI::enterprises.9.9.13.1.4.1.2.2059 = STRING: "Switch#2, Fan#1"
SNMPv2-SMI::enterprises.9.9.13.1.4.1.3.1060 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.4.1.3.2059 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.5.1.2.1059 = STRING: "Sw1, PS1 Normal, RPS NotExist"
SNMPv2-SMI::enterprises.9.9.13.1.5.1.2.2060 = STRING: "Sw2, PS1 Normal, RPS NotExist"
SNMPv2-SMI::enterprises.9.9.13.1.5.1.3.1059 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.5.1.3.2060 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.13.1.5.1.4.1059 = INTEGER: 2
SNMPv2-SMI::enterprises.9.9.13.1.5.1.4.2060 = INTEGER: 2
As you see, both PS1 (for both switches) are appearing normal. It doesn't even recognize RPS:
SNMPv2-SMI::enterprises.9.9.13.1.5.1.2.1059 = STRING: "Sw1, PS1 Normal, RPS NotExist"
SNMPv2-SMI::enterprises.9.9.13.1.5.1.2.2060 = STRING: "Sw2, PS1 Normal, RPS NotExist"
The first switch's power supply died and now the cable is disconnected. LED's of the power supply are out. And still: The switch happily announces by SNMP it's power supplies are up.
Is this a known bug? If yes, has it been fixed?
Model WS-C3750E-48TD
Firmware 12.2(37)SE1
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Could connect two Nexus 5648 to a stack of Catalyst 3750?

Good Morning,
Can I connect a two Nexus 5600 (switchs distribution) with switch Catalyst 3750 (switch access)?
I have tried to integrate the Nexus switch in the network as switch distribution, replacing a Catalyst 6500 switch and does not work. Everything is going very slow. Although all the ping function properly.
Is there any incompatibility connect two nexus 5648 to a stack of Catalyst 3750 by VPC?
Thank you.
Greetings.

Hi,
There can be many reasons for the switches not joining the stack like SDM template mismatch.
You may go through the following document:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html#wp40112
Thanks
Ankur
"Please rate the post if found useful"

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

Etherchannel with stacked switches on 3750

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