Stacking 3750 switches

I have a question, I have two c3750 in production alread and would like to stack them into one switch. My question is can you stack two switches that are already in production together? If so how, do I need to remove the IP address and the hostname of one then stack them? Any help would be appreciated.
Frank

Yes you will only need 1 ip and one hostname to manage the entire stack . If you want a particular switch to be the stackmaster for the stack you will need to set your priorities for the switches . Good page for 3750 stacking.
http://cisco.com/en/US/partner/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00801cdee3.html

Similar Messages

Cisco stack 3750 switch - some switches not accpet the changes

I have 3750 stack with 4 switches.
I am trying to make change some port to new VLAN, but switch 2 & 3 new change never works, the ports stick with old VLAN. Other two switches works as I expected on new changed VLAN.
Tried to reboot, no progress.
Any idea
#Show VLAN command confirmed the VLAN changes are made.
#show switch detail
                                               Current
Switch# Role     Mac Address     Priority     State
1       Member   0019.e752.xxxx     1         Ready
2       Member   0015.f9bf.xxxx    1         Ready
3       Member   0016.c880.xxxx     1         Ready
*4       Master   0011.bbe4.xxxx     1         Ready
         Stack Port Status             Neighbors
Switch# Port 1     Port 2           Port 1   Port 2
1       Ok         Ok               3       2
2       Ok         Ok               4       1
3       Ok         Ok               1       4
4       Ok         Ok               3       2
#show ver
Switch   Ports Model              SW Version              SW Image
     1   52     WS-C3750G-48TS     12.2(25)SEE2            C3750-IPBASE-M
     2   52     WS-C3750G-48TS     12.2(25)SEE3            C3750-IPBASE-M
     3   52     WS-C3750G-48TS     12.2(25)SEE3            C3750-IPBASE-M
*    4   52     WS-C3750-48P       12.2(25)SEE3            C3750-IPBASE-M

Now
Interface GigabitEthernet3/0/25 and Interface GigabitEthernet3/0/26 are changed to different vlan (308 and 324) , but previous VLAN 107 still traffic that ports..
#sh vlan confirmed the changes (at beginning, it does not show up the changes, after reboot system, it shows up, but not effect). Switch 1 and 4 ports changed to new vlan , it works. , any port changes on switch 2 and 3 not working, still with previous VALN 107
#sh vlan
113 DAL_Backup                       active
115 DAL_Testlab                     active
308 VLAN0308                         active   Gi3/0/25
324 VLAN0324                         active   Gi1/0/1, Gi1/0/26, Gi3/0/26
#show runn
interface GigabitEthernet3/0/24
switchport access vlan 107
switchport mode access
spanning-tree portfast
interface GigabitEthernet3/0/25
switchport access vlan 308
switchport mode access
spanning-tree portfast
interface GigabitEthernet3/0/26
switchport access vlan 324
switchport mode access
spanning-tree portfast
interface GigabitEthernet3/0/27
switchport access vlan 107
switchport mode access
spanning-tree portfast

Stacking 3750 switches with EMI and SMI versions

Hi!,
Is it possible to have in a stack Catalyst 3750 with EMI version and Catalyst 3750 with SMI?. In my case, it is a WS-C3750G-12S-E with WS-C3750-48PS-S. I didn't find clear information about this issue. I know different major releases are not compatible but nothing is mentioned about the feature set.
Thanks,
MONICA

Hi,
It's possible but not recommended. If you decide to do this you should buy 2 EMI so that if the master fails the backup can still route traffic. (Having 2 EMI is TAC supported, even if the rest is SMI - not sure about just having one EMI and one SMI)
HTH - plz rate if useful.
Andrew.

3750 switch stacks

I am new to the networking world and have some questions.
I have 1 stack of six 3750 switches with a 10.50.3.10 ip address
On the first stack (.10)I have int 6/0/19 , 20 and 21 assigned.
I have a second ip scheme with one switch with an ip of 10.50.3.11
Do I use a smartwise cable to connect the switches even though they have different ip schemes? Or do I use a only a cat 5 to connect the 2 differenet stacks. Also, do I need to configure the 6/0/19, 20 and 21 ports on the second ip scheme. I don't think it is possible now that I am writing this if the smartwise cables are not used. Any help would be appreciated.

I apologize but I am not following you entirely. If you stack the 3750, you must use the stacking port and use the stackwise cable.
You said: I have 1 stack of six 3750 switches with a 10.50.3.10 ip address
>> This would mean you stacked them using the stackwise cable and all these six switches are seen as one single device.
What do you mean by you have int 6/0/19-21 assigned? Assigned them what?
You said: I have a second ip scheme with one switch with an ip of 10.50.3.11
>> Sounds like you have another stack? Because the device will complaint if you address two different interfaces in teh same switch/router to the same subnet (10.50.3.10 and 10.50.3.11), unless these addresses are masked as host but I doubt that.

Snmp for 3750 switch stack

Hi,
I have two 3750 switch stack together with one ip address mange the stack.
Can I monitor the memory and cpu for each individual switch? what is the oid then?
Thanks.
C.K.

Hello CK,
On the Catalyst 3750, the stack master handles the SNMP requests and traps for the whole switch stack.
The stack master transparently manages any requests or traps that are related to all stack members. When a new stack master is elected, the new master continues to handle SNMP requests and traps as configured on the previous stack master, assuming that IP connectivity to the SNMP management stations is still in place after the new master has taken control.
So to answer your question, with the OID for CPU and Mempory usage the switch will return only values for the active master. The other stack members are hot standby and do not produce SNMP information for CPU and/or Memory.
HTH
--Leon

Best IOS version for 3750 switch

I have just received 2 3750 switches, but both have a different IOS version.
One has -> IOS version 12.1(19)EA1d
and the other has -> IOS version 12.2(25)SEB2.
I just want to use the switches as Gb collectors for a serverfarm seperatly (so no stack configuration) with a redundant uplink to my distribution layer.
Can someone advise my which IOS is the best for my network?
Thanx, Marty

Switch 1:
Cisco Internetwork Operating System Software
IOS (tm) C3750 Software (C3750-I5-M), Version 12.1(19)EA1d, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Mon 05-Apr-04 22:06 by antonino
Image text-base: 0x00003000, data-base: 0x009206D8
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(14r)EA1a, RELEASE SOFTWARE (fc1)
2224-3750-037000137 uptime is 23 hours, 52 minutes
System returned to ROM by power-on
System restarted at 09:02:42 GMT Thu Aug 11 2005
System image file is "flash:c3750-i5-mz.121-19.EA1d/c3750-i5-mz.121-19.EA1d.bin"
cisco WS-C3750G-24TS (PowerPC405) processor (revision H0) with 118776K/12288K bytes of memory.
Processor board ID CAT0904X00B
Last reset from power-on
Bridging software.
1 Virtual Ethernet/IEEE 802.3 interface(s)
28 Gigabit Ethernet/IEEE 802.3 interface(s)
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:13:1A:65:50:00
Motherboard assembly number : 73-7058-12
Power supply part number : 341-0045-01
Motherboard serial number : CAT090400A0
Power supply serial number : LIT09020266
Model revision number : H0
Motherboard revision number : A0
Model number : WS-C3750G-24TS-E
System serial number : CAT0904X00B
Hardware Board Revision Number : 0x09
Switch Ports Model SW Version SW Image
* 1 28 WS-C3750G-24TS 12.1(19)EA1d C3750-I5-M
Configuration register is 0xF
Switch 2:
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
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(14r)EA1a, RELEASE SOFTWARE (fc1)
2224-3750-037000138 uptime is 59 minutes
System returned to ROM by power-on
System image file is "flash:c3750-ipservices-mz.122-25.SEB2/c3750-ipservices-mz.122-25.SEB2.bin"
cisco WS-C3750G-24TS (PowerPC405) processor (revision L0) with 118784K/12280K bytes of memory.
Processor board ID CAT0925Z0WZ
Last reset from power-on
1 Virtual Ethernet interface
28 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:14:A8:71:CA:00
Motherboard assembly number : 73-7058-13
Power supply part number : 341-0045-01
Motherboard serial number : CAT09251J90
Power supply serial number : PHI09220165
Model revision number : L0
Motherboard revision number : A0
Model number : WS-C3750G-24TS-E
System serial number : CAT0925Z0WZ
Hardware Board Revision Number : 0x09
Switch Ports Model SW Version SW Image
* 1 28 WS-C3750G-24TS 12.2(25)SEB2 C3750-IPSERVICES-M
Configuration register is 0xF

QoS Questions for 3750 Switches

2x3750 switches are stacked and we are trying to simulate traffic congestion at the UTP ports by using Smartbit 6000C. The objective of the test is to see if the QoS setting works in reality even though we see from Wireshark that the packets are marked with DSCP for voice traffic.
Setup is as follows :
Smartbit<->Avaya IP Phone<->3750 switches<->6509 switch.
Please note that the configuration is set on the 3750 switch port as well as trusted on the Cat 6 switch port. However, when I set to continuous traffic with byte size of 64. Even though its a 100Mbps port, the Avaya IP Phone is already acting weird with hanged symptom. Just side note is that performing "show mls qos inter gi2/0/7 statistic" shows that data and voice traffic are marked on the different priority which seemed correct.
1) Is this the right way to test? If not, what should be the correct way?
2) The port that's connected to Smartbit is configured and it seemed that with the continuous traffic, even other IP Phones are hanged even though I have set Smartbit to hit on the IP address of the CAT6 Switch port. This is not normal right as this is supposed to be unicast traffic. Any idea what could be the reason?

Hello Brandon,
I understand your concern and how you want to test, but with the VoIP services you need to understand that there are 2 points (telephones if you want) involved. Your local one, where you might have taken all the necessary steps to protect and prioritize your voice traffic, and the oposite end which also need to have the voice packets prioritized.
Now, from your description, I understand that the packets (voice and data) marked correctly (I believe on C3750), but that's not enough. You need to use CBWFQ together with LLQ to give priority to the Voice traffic over data in case of congestion. Do you have such configuration? Can you show us some excerpt from it?
Next, during the testing, you said that your phone hang-up...where you in a call?
To respond to your questions:
1. The start is ok, but we need more details. You are pushing traffic from Smarbit, this is your local end, but where is the traffic pushed to (remote end), who is receiving the traffic?
2. In theory, you shouldn't have any impact over voice if links are 100Mbit, only if you have such a power packet generator that could fill 100Mbit. What do you mean by "This is not normal right as this is supposed to be unicast traffic"? VoIP is also unicast traffic...
I can see that you are determined to solve this issue, and this is OK as it will help you back with gained knowledge, but I have to warn you that troubleshooting QoS / Voice related problems may be more tricky than you think, as it will involve a strong know-how in these areas.
We will help, but you have to come back with more precise details.
Good luck!
Calin

How can I mirror all ports on CISCO 3750 switches to one Gigabyte port?

Hi,
I have a requirement to mirror all the ports on my 7 CISCO 3750 switches, which are in 3 separate stacks, to one single Gigabyte Ethernet port.
Does anyone know how I can do that?
Thanks in advance.

Vlad, thanks a heap for your response.
I want to apply to my sitation. Please let me know if I get them right in the following:
Catalyst A
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on the CISCO 3725)
monitor session 1 destination remote vlan 901
Catalyst B
vlan 901
remote-span (If I don't need to monitor this switch, do I still need to put anything into this switch at all?)
Catalyst C
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on this switch as well)
monitor session 1 source remote vlan 901
monitor session 1 destination interface gigabitethernet 3 (There are 4 Gigabit Ethernet Uplink in CISCO 3750, I want all the traffic to go to port 3, is this the right way to do?)
Thanks in advance.

Catalyst 3750 Switch

How many total Vlans can you create in Catalyst 3750 Switch ? I read a document about Catalyst 3750 Switch. This document is said that "Although the switch stack supports a total of 1005 (normal-range and extended-range) VLANs, the
number of routed ports". However, I am not sure. Can you confirm for me ? Thanks

this link should be of some help to answer your question.
http://www.cisco.com/en/US/products/hw/switches/ps5532/products_command_reference_chapter09186a00803ec324.html#wp1031710
HTH-Cheers,
Swaroop

CNA and stacked 3750s

Hi,
Just starting a new Cisco core. Using CNA,it sees one 3750 just fine. When I stack that with an identical 3750 (the stacking seems to be successful when I telnet into the master switch), it shows up as an unsupported device in CNA. Anybody help me figure out what's going on? Thanks in advance.

According to cisco whitepaper before that if you add or replace a new 3750 switch to be a memeber of the stack, the master will automatically download it's image to the new member if they don't have the same IOS. In our case, we have to make sure that the new or replacement one has the same image as the master.

CLI Template to run Archive Command to upgrade 3750 Switch in Prime

Does anyone have or know how to write a template to upgrade a mixed stack of 3750 switches in Prime Infrastructure 2.0? Prime does not support upgrading a mixed stack yet, but it can be done from command line.
the command line would be:
archive download-sw /allow /overwrite tftp://10.30.2.14/3750efilename tftp://10.30.2.14/3750filename

Hi,
Please check:
1. You need to download the correct .tar image file;
2. Copy it to the root of your FTP or TFTP server;
3. Upload, extract and install the .tar file to the switches (I always use the /imageonly option, because I don’t need the html files for management);
4. Reload the switch stack;
Please use this command:
sw-stack#archive download-sw /imageonly /overwrite /allow-feature-upgrade ftp://user:password@/image-file.tar
The boot parameters are automatically changed to the new IOS firmware. You can check the boot parameters with the show boot command.
Regards
Dont forget to rate helpful posts.

3750 switch not forwarding EAPoL to RADIUS server

I have a 3750 switch stack running version 12.2(53)SE2 IPBASEK9-M. I have dot1x configured on the switch and have a Windows 7 PC connected with 802.1x configured on the interface. I see the EAPoL start message from the PC, but I don't see any RADIUS packets from the switch to the RADIUS server. I have a simple dot1x config just to try to get it working prior to adding additional features such as guest-vlan...
Config and debug file attached.
I don't know if the ip dhcp snooping and arp inspection configuration is causing an issue with this or not. I see the EAPoL packet received on the switch as seen in the debug attachment, but I still never see the RADIUS packet. I did set both to trust on the interface but still the same outcome. I can't disable it since it is a production switch with a test interface.
Any ideas?
Thanks,
Mark

Hi Mark,
The config seems to be OK, nothing I would miss if I assume that mandatory
commands not shown in your config are in place
aaa-new-model is required for dot1x to function, I don't seee that command.
I have configured dot1x just a few times but I always used the commands
aaa authorization network default group radius
and
radius-server vsa send
(honestly, I'm not sure whether they are required, it's just a template which
I know as working)
Careful if this is a production system
AAA New-Model will radically change every authentication behaviour on the
switch if it is not already configured
The main issue seems that the catalys is not sending an "EAP-Request/Identity"
back, Radius-Packets will only be sent after the "EAP-Response/Identity":
(taken from http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/software/release/12.2_50_se/configuration/guide/sw8021x.html)
Do you have any other dot1x client?
You can use a cisco router for testing dot1x if you have
test system at hand:
conf term
dot1x credentials DOT1XTEST
username testuser
password testpassword
exit
interface [name-of-interface-connected-to-catalyst]
dot1x pae supplicant
dot1x credentials DOT1XTEST
Another approach:
use the classic config (not auth-manager but "dot1x syntax") you are
using a very new version of IOS, might be buggy:
Switch(config)# aaa new-model
Switch(config)# aaa authentication dot1x default group radius
Switch(config)# aaa authorization network default group radius
Switch(config)# radius-server host [IP-address] auth-port [port] key [port]
Switch(config)# dot1x system-auth-control
Switch(config)# interface [interface]
Switch(config-if)# switchport mode access
Switch(config-if)# dot1x port-control auto
Hope something is helpful
Additional debug hints:
use
show dot1x all
show dot1x interface [interface-name] detail
show dot1x interface [interface-name] satistic
Do see something like "RxResp = x" with x>0?
rgds, MiKa

Can you stack 2960 Switch?

My question is can I stack two or more 2960 switches, master/slave design and be able to manage them both using the CMS technology or not. I don't quite understand the SFP, Small Form-Factor Pluggable, and the 2960 uplink ports. It appears as though one uplink will be in standby mode, therefore both ports can't be active at the same time. If that is the case it looks as though you can't stack becasue of only one uplink port being active.

Hi Washro,
You cannot stack 2960 switch like you can do 3750 switches but you can still achieve clustering on this switch.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2960/12240se/scg/swclus.htm
Also both uplink ports can be active at a time if they get connected to some other switches but if 2 get uplink to same switch then STP will block one port.
HTH
Ankur
*Pls rate all helpfull post

Connection of LC/APC fiber patch cords to Cisco Catalyst 6500 $ Cisco Access 3750 Switches

I have an LC/APC fiber patch cord infrastructure and I want to connect it to Cisco Catalyst 6500 & Cisco Access 3750 Switches. what type of transceiver should be used?
I read a note on Cisco website stating the following for Cisco SFP+ transceivers:
Note: "Only connections with patch cords with PC or UPC connectors are supported. Patch cords with APC connectors are not supported. All cables and cable assemblies used must be compliant with the standards specified in the standards section"

Thank you, but my question is that I have a single mode fiber patch cord with LC/APC connector while cisco stating a note that only use LC/PC or LC/UPC type of connectors with SFP+ transceiver.
So what type of transceiver should I use to connect LC/APC patch cord to cisco switches? Is there another type or SFP+ still can be used?

802.1x "MachineorUser" Auth Mode strange behavior in 2950 & 3750 Switches

Good Day Support Team around the world,
Having started recently tests with 802.1x in a lab environment, I noticed a strange behavior related to authentication. First let me provide you with the network components I used.
supplicant:                    domain-joined laptop with Windows XP SP3 802.1x embedded client
authenticator1:              Cisco 2950-24
authenticator2:              Cisco 3750-24
authentication server:     MS NPS Windows Server 2008
1.     In the first scenario with 3750 switch when I connect the laptop to relevant port the machine authentication is successful. Then I try to login with a domain account and again the authentication is completed without any problem. Then I log off and user authentication is revoked and the machine authentication is used again without any issue. When I try to login again as local user the authentication fails as expected but the port remains disabled (port blinking amber) regardless the fact that port is configured for Auth-Fail Vlan. When I log off then the machine authentication is used again and the access is granted.
2.     In the second scenario with 2950 switch as authenticator, I follow the same steps as before and when I try to login as local user the authentication is failed and the port is assigned the Auth-Fail Vlan (as expected based on configuration). However when I log off it seems that the 2950 switch still use the Auth-Fail Vlan for that port and never authenticates again for machine authentication.
Could you please let me someone know if this is normal ( I suppose no). Please find attached the relevant debug output from the second scenario.
Thank you!!!

Hi,
basically what happens is that the maximum EAP packet size for communication between client and RADIUS server is negotiated. Therefore, in your case the switch notifies NPS that the client is capable of handling packets up to 9000 bytes in size.
EAP messages, especially those containing the server certificate, are usually bigger than 1500 bytes and arrive at the switch in multiple fragments:
Mar 6 15:50:11.881: RADIUS(0000002C): Received from id 1645/41
Mar 6 15:50:11.881: RADIUS/DECODE: EAP-Message fragments, 253+253+253+253+253+253+253+253+20, total 2044 bytes
Having learned that 2044 bytes is acceptable for the client, the switch forwards the full message in one chunk, but since your client is likely to have set the interface MTU to 1500, the packet is oversized and never reaches its destination.
And yes, I think changing the System Jumbo MTU to 1500 bytes would lead to the same result. If my memory serves me right, a new setting takes effect only after a reboot, so I'd suggest giving it a go in your lab first.
Best regards,
Josef

Stacking 3750 switches

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