Cisco WAN :: 3750 Layer3 Switches - Connect Them Via Stack Cable

Jul 11, 2012

I have two 3750 layer3 switches and I need to connect them via stack if I connect them with the stack they will be act as an one switch, but for the configuration if I create a VLANs on the master switch (applied all the configuration on the master one) this configuration will be transfered to the slave one or I have to repeat the configuration that I did on the master.

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Cisco Switching/Routing :: 3750 Stack-wise Cable Long Enough To Connect Two Racks

May 8, 2012

We have two dedicated racks for our DMZ. We need to connect them to a firewall. We do all the cabling inside the rack, so each of them must have a top of rack.Problem is, switch in rack 2 will be connected to rack 1 and then to firewall, so if switch 1 fail, we lose both of them.
I would love to stack them like 3750 but I don't think there is stack-wise cable long enough to connect two racks (and I suppose this length isn't supported by technology).We have only one port left in the FW.

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Cisco LAN :: Stack 3750 - Some Switches Not Accept Changes

Mar 8, 2012

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.

#Show VLAN command confirmed the VLAN changes are made.
#show switch detail
Switch# Role     Mac Address     Priority     State
1       Member   0019.e752.xxxx     1         Ready
2       Member   0015.f9bf.xxxx    1         Ready


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Cisco :: CiscoView Not Displaying All Switches In 3750-Stack

Apr 17, 2012

I am running LMS 4.1 and have an issue with Inventory: I have a stack of four 3750 switches, but only two of them are showing up in CiscoView. If I right-click - Topology - Device Report ;  I see all four switches. The switches are standard 3750 switches and should be included in the Device Packages for CiscoView
Also if I go Reports  - Detailed Device ; I see the same two devices show up under Module Information. However when I go to Reports - Device Attributes ; I see all four devices correctly displayed.
I have tried and deleted and added the stack in CiscoPrime, but with same result.

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Cisco :: 3845 Enabled For CDP Connected To A Stack Of 3750 Switches

Oct 20, 2009

I have a 3845 enabled for CDP connected to a stack of 3750 switches. From the router, i dont see any CDP neighbors. From the switch, i can see the router as neighbor. Why isn't the switch showing as a neighbor from the router side? [code]

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Cisco Switching/Routing :: 3750 - Running 7 To 9 Switches In One Stack

Aug 6, 2012

Looking for feedback from other organizations that have large 3750 stacks.  I've got one stack of (8) 3750's composed of (6) 3750G's and (2) plain 3750's.  This particular stack is usually unresponsive to SNMP queries and often fails to write config when we make changes.  After a couple tries it will finally go.  Part of my probably here is likely the plain 3750's that always boot faster and come up as the master.  I should manually set the master to one of the G's.  What I'm wondering is who else has 7-9 3750's stacked and are they performing well for SNMP, telnet, etc?  I've got another newer stack of 7 3750E's that I need to add one more switch to.  Need to decide if I want extended downtime to break the stack up or just add the 3750X to make member 8 and hope it performs well.  I have 50+ 3750 stacks working great on our campus.

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Cisco Switching/Routing :: 3750 Stack Switches IOS Upgrade?

Nov 13, 2012

I am trying to do ios upgrade on 5 stacked 3750 switches. All the switches have different model number, so i am wondering which image file i should download. As far as i understand all the stacked switches should have the same IOS, i may be wrong. The switches have the following model numbers and SW images;
Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
     1   28     WS-C3750G-24PS     12.2(35)SE5             C3750-IPSERVICESK9-M
*    2   28     WS-C3750G-24PS     12.2(35)SE5             C3750-IPSERVICESK9-M
     3   52     WS-C3750G-48PS     12.2(35)SE5             C3750-IPSERVICESK9-M
     4   30     WS-C3750E-24PD     12.2(35)SE5             C3750E-UNIVERSAL-M
     5   30     WS-C3750E-24PD     12.2(35)SE5             C3750E-UNIVERSAL-M
which image file i should use as they all have different model numbers and Cisco provides different image files for each model.

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Cisco Switching/Routing :: 3750 Stack Switches Not Showing Up

Jan 27, 2013

We have several stacks of 3750 switches where this problem is occurring.  All of the switches are running IOS version 12.2(50)SE3.  (Yes, I know it's old.)
We're seeing inconsistency in how the stack reports members when issuing the following commands:
sow switch
show version
show inventory
Not all members are showing up in the output of the "show version" and "show inventory" commands.  For example:
HUNTI-WV-WDAC03#sh switch
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
1       Member 108c.cff2.ea00     15     0       Ready              
2       Member 8cb6.4f0a.a600     1      0       Ready              
*3       Master 8cb6.4f0a.9c00     1      0       Ready
(all three switches in stack are displayed)(code)

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Cisco Switching/Routing :: 3750 - Etherchannel Across 2 L3 Switches To Stack

Mar 26, 2012

I am wanting to etherchannel from a 3750 stack to core Layer 3 switches (also 3750) with a cable going to each core switch, I have put both core switches and the stack under a 28bit subnet mask, but I dont seem to be load balancing across both links.

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Cisco Switching/Routing :: How To Add Four 3750 Switches Into Existing Stack

Sep 22, 2012

I have 3 3750  staking switch with the following configuration:

                                            H/W   Current
Switch#  Role   Mac Address     Priority Version  State
1       Member 442b.0350.9400     1      1       Ready              
2       Member 442b.0357.8780     2      1       Ready              
3       Master 442b.036f.a800        3      1       Ready              
The new switch is installed to be wired to the master switch. the swtich 3 (* 3 Master Ready 442b.036f.a800)my question is: if you disconnect the wiring from the master stack to connect to the new switch, it is possible that the new switch change the current configuration of stacking.
-Can I just add the new switch with clean configuration without changing the current configuration ?
-How is assigned the stack number? i need the new switch be with the GI4 / x?. I can I manually by assigning ports?
-If I want to the new 3750 member witch lower prioridad, can I change priority before adding to stack?

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How Does Cisco Prime NCS Handle The Device Licenses For Stack Of 3750 Switches

Nov 25, 2012

before I open a TAC case: How does Cisco Prime NCS handle the device licenses for stack of 3750 switches? Just one device license for the stack or a license for every physical switch in the stack? I can't find a answer on the Cisco website, but maybe one of you knows it from a deployment you have done..

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Cisco WAN :: 3750 - Access Switches Not Accessible When Stack Member Got Rebooted

May 20, 2012

We have got 2 3750 switches in the stack which are connected to access switches with 2 uplink ports .  each 1 uplink from each physical stack switch .
Due to some power issue our member switch got rebooted. After the reboot the access switches were not reachable through ping , but i was abe to see access switches in "show cdp neighbour" .   Then i rebooted the master switch and member switch one after other . after which i was able to ping the access switches.
IOS Version : c3750-ipservices-mz.122-35.SE5.bin

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Cisco Switching/Routing :: 3750 - How To Remove Stack Info On 2 Switches

Feb 20, 2012

I have been given 2 x 3750 switches that were a stack, I need to keep the configs on both but how do I make them individual switches again and remove the stack info?

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Cisco Switching/Routing :: 3750 - Actual Frame Path Between Switches In Stack

Feb 12, 2013

Lets say i have 2 3750 switches stacked via backend stack cables. Now if a packet needs to go from 1 switch in the stack to second switch in the stack, will it travel via stack cable or do we need to connect both switches via uplink ports (ethernet or sfp). I tried reading datasheet but it no wheres mention the actual frame path between switches in stack.

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Cisco Switching/Routing :: 3750 Stack Switches Compared To 4500 Series

Dec 30, 2011

I'm thinking about using a 3750 stacking around 4 or 5 switches intead of using one 4500 series switch.
1-My first argument was concerning the budget (one 4500 instead of four or five 3750 in stack mode) ---- Here i think 4 or 5 stacked 3750 is cheap than one 4500
2- My second argument was about harware redundancing that i don't have with one 4500 and that i have with stack mode ----Here i have more hardware redundancing with 3750
3- The bug that we notice today in 2960 and 3750 and not in 4500
4- Simple to manage a 4500 compare to 3750 stack design
5- I was looking also for the one with best backplane ----Here i didn't have any infos concerning the best backplane between 4 or 5 stack 3750 and a 4500.
6- I'm also looking for power redundancing.

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Cisco Switching/Routing :: 3750 Stack To Upstream ISP Separate Switches - MAC Flapping

Mar 11, 2012

I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP.  The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
As you can see I utilise a VLAN SVI to route traffic to the upstream (illustration only) IP.  As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
If I was to remove the port channel configuration from the two ports associated with the VLAN SVI, am i right in suggesting this would still form a layer 2 loop?  The two ports would still be a member of the SVI VLAN, and it is the VLAN MAC address which is being learnt by the two ISP switches on different interfaces.

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Cisco :: Connecting And Configuring Two Wlc In High Availability To 3 Switches In Stack 3750 In Difference Ports?

Aug 1, 2011

Is possible connect and configuring two cisco wlc in high availability to 3 switches in stack 3750 in difference ports?For example
WLC B (Secondary) - SWITCH SLAVE
How can i connect the wlc's in HA to get a redundancy in the stack?

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Cisco Switches :: SG300 10 Layer3 And InterVLAN Routing

Apr 25, 2011

I'm trying to get the following running.
I have 4 Subnets
VLAN 1        with the default GW
VLAN 10     with the default GW
VLAN 59     with the default GW
VLAN 130   with the default GW
With absolutly the same settings I did this with an HP E4200-12G L3 Switch (which is now doing the job) so there is no routing mistake in the other components.For me it looks like, the SG300 doesn't like to be NOT the default gateway.

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Cisco Switches :: SG300-10 ACL Entry In Layer3 Mode?

Jul 26, 2011

I'm setting up two vlans and I would like all of vlan 2 to only have access to the WAN router on vlan1 at
VLAN1 192.168.30.x
VLAN2 192.168.31.x
I've setup the VLANS and static routes and I'm able to access the WAN router at from the 192.168.31.x network and everything is fine.
I'm getting an error setting up the IPv4 based ACL that is designed to allow the 192.168.31.x network access to only the WAN router.
The first rule I setup is to permit source / dest to allow all traffic to from the 192.168.31. net to access the 192.168.30.x net. Then I was going to deny the dest of but I'm not sure of the wildcard to use for that.
I'm not clear on the wildcards but I'm also getting the following error when I setup the first ACE rule:
"MIB Index is out of range.Index must be bigger then 0 and Existing ifindex.."
I suspect the error is related to how I'm using the wildcards?

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Cisco Switching/Routing :: Configure 3750 Stack As Core / 2960 As Access Layer Switches

Sep 29, 2012

I configure 3750 stack switch as core and 2960 stack switches as access layer switches.I connected my laptop to one of my core stack in VLAN 10 and I am pinging to one of my server in VLAN 1. What will be the minimum latency at the time of inter VALN routing

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Cisco Switching/Routing :: Output Queue Drops On 3750 Core Stack And 3560 Edge Switches

Jan 10, 2013

I've been fighting what seems to be an increased number of outqueue drops on our core stack and edge switches for the last 3 or 4 weeks.(The core consists of a stack of 5 3750s in 32-gig stack mode. The wkgrp switches are 3560s. all are at 12.2.52) The  wkgrp switches are directly connected to users. We use Nortel IP phones with the phone inline with the user PC. auto-neg to 100/full. [code] However I have tried turning off QOS on a couple of workgroup switches (no mls qos, but left individual port configurations the same) but am still seeing drops.Since I have disabled qos on the switches in question (no mls qos)  (not the core tho) I am presuming these commands have no affect on the switch operation and therefore cannot be related to the problem. With QOS turned off one would presume that it is general congestion - especially at the user edge where busy PC issues might contribute. So I wanted to see if I could see any instances of packets in the output queues building up.
 I wrote some scripts and macros that essentially did a snapshot of 'show int' every 20 seconds or so, and looked for instances of 'Queue: x/' where x was greater than zero.What I found after several days of watching the core stack, and a few of the workgroup switches that are most often displaying the behavior, was that I NEVER saw ANY packets in output queues. I often saw packets in Input queues for VLAN1, once in a great while I would see packets on input queues for fa or Gi interfaces, but NEVER on output queues. [ code] Additionally, when I look (via snmp) at interface utilization on interfaces showing queue drops (both core and wkgroup), they are occurring at ridiculously low utilization levels (as low as 4 to 8%). I've tried to look for microbursts between the core and a wkgroup switch where the core interface was experiencing drops, but haven't seen any (using observer suite). [code] While the queue-drop counts aren't critically high at this point, they are happening more frequently than in the past and I would like to understand what is going on... In most cases, no error counters are incrementing for these interfaces. Is there some mechanism besides congestion that could cause output queue drops?

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Cisco Switching/Routing :: 3750 Connect Stack Cables To New Switch

Dec 11, 2011

At a customer i've tried to add a new 3750 switch til a running stack.I used the following proccess:
1. connect stack cables to the new switch

2. bootup new switch.
Normally the new switch will become a member of the stack, but here, the switch says its the stack master. I can see that the stack port from the old switches connecting the new is up.The only way i could make it work was to provisioning the new switch as switch nr x, save, power off and then connect it and boot it up.The IOS i the same on all switches.

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Cisco WAN :: Replacing A Stack Master In 3750 Stack?

Jan 22, 2013

We currently have as our stack master a 24 port Non-PoE that we want to replace with a 48 port Non-PoE. The 48 port switch at one time was provisioned as switch 3 in the stack (not the master). Correct me if I am wrong, but theoretically all I should need to do to get this working is to shut off the existing master so it re-elects a master and then provision the 48 port switch as the new switch one and make sure switch 1 has a high priority?
Do I need to write erase the switch that is replacing the current master first?          

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Cisco Switching/Routing :: Use Both Interfaces On 2921 To Connect To 3750 Stack Switch 1 And 2

Nov 9, 2012

I have a Cisco 2921 and a 3750 stack. I want to use both interfaces on the 2921 to connect to the 3750 stack switch 1 and 2. Is this possible using same ip subnet?

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Cisco :: 5508 / 3750 - Connection Between Switches Using SFP Cable

Nov 14, 2011

I have to realize a connection between  an 5508 WLC and 3750 switch using one SFP cable. I found on Cisco documentation some reference about two different SFP cables. The first one is CAB-SFP-50CM, but this is used to interconnect two 3560 switches. The second is SFP-H10GB-CU1M. This one has SFP+ transceivers on both ends which I don’t know if are compatible with the standard SFP ports that can be found both on WLC and switch.

My question is if I can use one of these cables in order to connect my devices, or if you know other one piece SFP cables.

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Cisco Switching/Routing :: CAB-STACK-50CM Bent Stack Cable

Feb 27, 2013

Is there a stacking cable that is "bent"?Im using this cable:"CAB-STACK-50CM", "Cisco StackWise 50CM Stacking Cable".But it takes up to much room in the back of the switch, is there such a thing as "bent" stacking cable.

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Cisco Switching/Routing :: Catalyst 2960 - Can SFP+ Cable Be Used To Connect As Stack?

Apr 25, 2013

I have two Cisco 48 port Catalyst 2960-S series SI. Instead of buying the pricy stack modules can I only use the SFP+cable to connect them as stack? which type of SFP+cable should I buy? do I need any license to use those SFP ports?

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Cisco Switches :: SG500x Stack And Connect To A NAS Device At 10G

Oct 11, 2012

I purchased 2 SG500x switches that I will stack and connect to a NAS device at 10G. I need to purchase transceivers. The documentation has me confused. I just want to make sure that I can use SFP-10G-SR to stack and as the interface to the NAS. S1/S2 for stacking and XG1/XG2 to connect to the NAS all at 10G.                  

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Cisco Switching/Routing :: 3750 - Two Switches Connected With Single Mode Cable

Jun 4, 2012

I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.

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Cisco Switching/Routing :: Connect 3550 And 3750 Through Cross Over Cable Trunk Link?

Jan 8, 2013

I am trying to implement in the lab. I have 2 switches 3550 and 3750. my questions are:
1. why i can't see vlans in the running config on switch 3750 even after i created 3 vlans?

2. the 3750 is power over ethernet switch and i am trying to connect 3550 and 3750 thru cross over cable trunk link and the ports doesn't show up no light nothing. is it the right way of cabling.

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Cisco Switches :: SGE2010 Can Use 4 SFP Ports And Stack Of Two Switches At Same Time

Feb 15, 2012

I looking to buy SGE 2010 swith, but I have some question:

1. Can I use 4 SFP ports and stack of two switches at the same time.
2. Is it possible to use for stacking  ports other than 24, 48?
3. What is maximum possible number of ports  to use for stacking (can I get more than 1Gb thruput).

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Cisco :: 2600 Terminal Server Can't Connect To 3750 / 3560 Switches

Jul 23, 2012

I have a 2611XM that I am using as a terminal server for my lab setup.  Async is using octal cables.  It works great with routers of all different models, but when I connect a switch of any model, it does not work.  The connectivity LEDs don't even light (they do for the routers).  The switches in question are 3750s and 3560s. 
I have tried straight through from the octal cable to the console port of the switch, as well as a rollover with a converter, no luck.  This does seem to be independent of configuration on the console port - even before the console port of the routers were properly configured, I at least had indication of physical connectivity.

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Cisco WAN :: High CPU On 3750 Stack?

May 1, 2011

I have been seeing high CPU on a 3750 stack we use for our phone system. I followed the documentation here:
This documentation pointed out that the interrupt was very high and so I started looking at the CPU queues to debug. The icmp queue was dropping TONS of traffic.
The debug was full of these:
ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan248 L2If:GigabitEthernet1/0/17 DI:0xB4, LT:7, Vlan:248   SrcGPN:17, SrcGID:17, ACLLogIdx:0x0, MacDA:001a.a1c4.1cd2, MacSA: 0013.192c.bb80   IP_SA:


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