Questions tagged [stacking]

For questions about stacking of network devices. For instance, you are stacking a new set of switches or firewalls, where you need help with configurations or are troubleshooting a problem.

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Renumbering Cisco 3750X Stack

I am thinking about renumbering my Cisco 3750X stack. Currently as it sits, the stack from top to bottom is Switch 5 Switch 1 Switch 2 Switch 3 Switch 4 I am wanting the stack to be renumbered to ...
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1answer
56 views

Two switches, one uplink - best way to link them?

Overview I have two Arista 7050SX switches. They don't support stacking. But I essentially will be using them as a stacked pair none the less (just means managing two individual switches). They're ...
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2answers
58 views

switch died after slow to rapid failure now DHCP will not function across network even with new switch

ok so i'm running out of ideas here. we have/had 3 managed switches in our server rack and one in a closet; one hp procurve 3500yl 48 port with poe for 2 APs and 2 catalyst 2960s in the bottom of the ...
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24 views

HPE 3800 stack routing fails if a certain member is off line

We have a pair of stacked 3800's connected to a pair of stacked 2920's.  We have inter vlan routing enabled with a different subnet on the 2920's.  This has been up an running for about 3 years ...
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1answer
56 views

Any expected issues with stack of 8 Cisco 3750X switches?

I am planning the network for our new offices this time utilising Cisco 3750X's (WS-C3750X-48P-S). The required port count has gone up and up so have had to procure some extra switches to bring the ...
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2answers
54 views

Can you stack Cisco 350 28P PoE switches with CAT5E or CAT6 ethernet cables?

I have four new Cisco SG 350 28P PoE switches, but no stacking cables. Can I use CAT5E or CAT6 ethernet cables to accomplish stacking them?
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1answer
34 views

Stack Configuration remove

i have only one cisco 2960 running at location. Switch neither connected in stack nor any cable connected, still in running configuration, it shows switch is in stack and having two two interfaces ...
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0answers
19 views

Mirroring an HP (19xx) stack

I'm looking for a way to mirror an entire HP 19xx switch stack. I have a stack composed of 10 switches and I want to mirror ALL ports (except stack ports) to a single monitor port. Is it possible to ...
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390 views

Cisco 2960X stacked switches pop up ACL error messages without any ACL configured nor input

I have a few Cisco 2960X with the fiber flexstack modules, when I boot them up, I always got these message: 'Duplicate sequence number. Failed to add ace to access-list' These are brand new switches ...
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1answer
770 views

Adding a new switch to a C9300 stack

We currently have a stack of Catalyst 9300, like this : SW1 (master) SW2 SW3 We plan on adding a 4th switch, SW4, but in between SW2 and SW3. This would give: SW1 SW2 SW4 SW3 My question is : ...
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1answer
148 views

HPE IRF Stack why do I need two physical ports?

I'm building exactly the same topology, but there is no explanation why do I need two physical interfaces in IRF stack? So, can someone please explain me, why do I need two physical members in IRF ...
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1answer
41 views

Connecting VDX6740 to ICX7750 core network stack

I am trying to figure out how to configure both MSTP for the core network and if I will need to enable MSTP on VDX6740 for this diagram after adding the new datacenter switches: Diagram link: https://...
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1answer
226 views

Stacking Dell N3000 with and without stacking cable (distance)

First question here. I have a new scenario that I am not sure on how to achieve. I have a stack of two Dell N3024 switches (our core stack), that I need to add two more units to. However, these two ...
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1answer
2k views

Cisco 2960X - Add Stack Member

I need to add another Cisco 2960x stack member to our existing stack and I just want to check that the steps I have in mind are correct: Power up the new switch and check that IOS matches that of the ...
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1answer
490 views

HP Stacking Not Joining

I have 2 HP 2920 switches and they aren't stacking as I'm expecting. Both models are the J9729A, however one is Aruba branded and one is the original HP brand. Everywhere I read this shouldn't be an ...
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1answer
85 views

2960 x Switches Stacking

can we have POE & NON POE Switches Stacked in on loop Exp( 2 nos of 2960 X 48 FPDL and 2 nos of 2960x 24 Port TDL
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3answers
736 views

Theoretical: Bottleneck in a switch stacking environment

Quick question regarding stacking environments and their limitations regarding traffic bottlenecks. Assuming the following use case: We have a stack of 8 switchs, forming a Half 10Gbps stack ring. ...
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2answers
502 views

Endpoint MAC address change detection [closed]

A question regarding a host behavior when gateway mac address has changed (although it deals with Windows, I think it's the best forum). Assuming a windows host sending trafic to a destination IP, ...
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1answer
331 views

How many stacking cables does a pair of stacked Dell switches need?

According to https://www.dell.com/support/article/us/en/04/how10356/how-to-stack-n2000-or-n3000-switches, when stacking Dell Switches, one should perform the following steps: For each switch in the ...
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2answers
3k views

Changing The Stack Master of a Catalyst 3750 Without Losing Connection

Currently I have 5 Catalyst 3750 V2-48TS as slaves and 1 Catalyst 3750g 24TS-1U as the Stack Master. I was wondering if there was any way to change the Stack master to one of the slaves without ...
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1answer
380 views

Stacking different HPE switches

Is it possible to stack 1 Aruba 2920-48G (J9728A) with 1 Aruba 2930M-48G (JL321A) each with its proper stacking module ?
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2answers
408 views

D-Link Stacking

I want to stack two D-Link DGS 1510 with each other. Both of the switches already have a running config. My question is if one of the running configs will be used for the new stacked switch or that ...
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1answer
2k views

Interface suspended when linking access to core

Some help required please. I have a stack which contains two access switches, and an interface from switch 1 has a successful link to the core. However, when I try adding a secondary link on switch ...
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3answers
2k views

Stacking master and member correctly

I have two Cisco Catalyst 2960-X Series switches which I've stacked. I want the master to be switch 1 and the member to be switch 2. After doing research on stacking the switches, it's my ...
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2answers
16k views

Remove switch provisioning from individual switches

I've been given two switches to work on, which separately have been used in a stack previously. One switch for one stack, and one switch for another st.ack in a different building. So they're not ...
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1answer
944 views

Cisco 2690x-Flex stack not working

I have 2 identical Cisco 2690x with flex stack plus modules installed in both. I have provisioned the first and it is up and running. When I add the second to the flex stack module and turn it on, it ...
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2answers
8k views

Addition of new switch to an existing 3850 stack

I have a existing switch stack with 4 switches in the stack (all of them are 3850). Switch Ports Model SW Version SW Image Mode ------ ----- ----- ----...
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1answer
300 views

Updating config on 2960s Stack by copying from FTP

I'd like to upgrade a stack of Cisco 2960s switches with a new configuration, and I would like to know what is required to copy a pre-populated config.text file from an FTP server to the switch stack. ...
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1answer
676 views

3Com 5500G EI Switch Stack Configuration

I have 2 3Com 5500 switch in stack and one of them is fault, I want to replace them with a new switch, which configuration must be added to the new switch before it can be added to the switch stack? (...
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1answer
652 views

Distributed Trunking with HPE 5130?

I am about to plan a Core Switch for a customer, who has only access switches connected to each other. I'd like to connect every core switch with two fiber connections to each of the two HPE 5130. I ...
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3answers
6k views

Cisco 3750 switch stack with different IOS images

There is a situation here, I am trying to add a new switch to an exisiting stack and i found out that the switch image in my current stack and the new switch is different. Can i still go ahead and add ...
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2answers
2k views

One of a switch in a stack is frozen

I have a stack of 3750 switches, which have 5 switches in it. One of the switches (switch 4) in the stack is frozen. The way I can tell is because all the lights on the switch are turned on, and I ...
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2answers
8k views

Addition of new switch to an existing stack

I have a existing switch stack with 5 switches in the stack (all of them are 3750). Now, I have to add another switch (3750) to that stack. I turned on the new switch that I got from my company to ...
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1answer
148 views

Dell 4048 - Metro Ethernet Topology?

I have a customer with 3 sites, 5000 users. 2 sites are Data Centers and 1 site is HQ. The sites are connected via ring topology with 10G MetroEthernet service - that's 6 10G ports in all across 6 ...
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1answer
48 views

New to HP Switching. Asking topology questions

I have following design: When I learn switching i started learning on cisco switches. Now We have 3 hp switches. We have to configure spanning tree between sw1,sw2 and sw3. All I did was type ...
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3answers
2k views

Is possible to stack/uplink different brands of switches using SFP?

I'm sorry if it's a silly question but in networking things I'm a complete newbie. We have some switches (DELL) two of them are connected with SFP (fiber) along a long hall, the rest are stacked via ...
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1answer
103 views

Accessing D-Link stack members separately

I have a D-Link switch stack, can not figure out how to fore needed switch to became a master using config stacking force_master_role I simply do not get what will this command to and the D-Link's ...
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2answers
1k views

Netgear SFP and trunking between three switches

Can you use SFP stacking with trunking? We have two Prosafe S3300-28x switches stacked using two SFP cables. These switches also have two 10Gig ports, which we would like to connect to a separate ...
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1answer
2k views

LACP trunk between BNT layer2/3 switch and Cisco 2960s stack on a bladeCenter H

My objective is to replace a Nortel 5520 stack with a stack of Cisco 2960s. The old working configuration was using mlt trunk between 5520 and BNT layer 2/3 switch. I will use LACP for the trunk ...
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1answer
82 views

Stacking HPE 2920

I have some 2920 that are running in our DC which for some reason was never stacked, and now I'd like to fix that after the fact. I have all the gear, and I've done stack installations on brand new ...
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1answer
186 views

HP ProCurve Stacking

How do i telnet back? I have done stacking using 2 dummy HP Pro Curve 2610. Gateway for Commander is 192.168.1.1 , while member has 192.168.1.2. I was in Commander Switch, then i telnet to the ...
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1answer
7k views

C3850 switch active/standby question

We have Cisco catalyst C3850-48T L3 switch in stack. and it is showing Active/Standby. Question: what does standby mean in stack? Does it means if i plug my laptop on standby switch port it won't ...
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1answer
2k views

Stack switch with HSRP for Gateway redundancy

We have ws-c3850-48t two switch in stack. and from Internet Provide ISP we have two fiber drops coming for redundancy. I want to configure HSRP for failover but i believe stack switch work like single ...
4
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1answer
2k views

2-stacked switches with 2 uplinks to each ASA

My current single uplink from 2-stacked switches to ASA is not enough to cater the link utilization (upload traffic from the 2-stacked switches to ASA). So, I have thought of using 2 uplinks. If I use ...
2
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2answers
70 views

Add stacking modules to powered on GSM7252PS

I've looked all over and can not find a for sure answer to this. Can you insert stacking modules into a Netgear GSM7252PS while the switch is still powered on? This switch is located in a production ...
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3answers
3k views

How can I expand my office network with a SG300-28P switch?

At this moment, I have a SG300-28P switch, but it's running out of ports. I want to order another SG300-28p, but I have no idea what modules and cables I need to stack those switches. Does anyone ...
4
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2answers
2k views

Stacking Cisco Catalyst 3850 via Fibre?

I'm working at several new network concepts for our company and the challenge is to stack at least two Catalyst 3850 over a distance of 200-300 meters. I know there are other possibilities like VSS or ...
2
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1answer
2k views

Creating one virtual switch that extends over two HP 2920-48G?

We have two HP 2920-48G. Our vendor told us, that we should create a virtual switch that extends over both physical switches. That way I don't have to manage two physical switches, but only one ...
3
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3answers
4k views

Upgrading Cisco 500 series stackable switches in stacking mode

My switch model is: SG500-28-K9-G5 to be precise. I have four switches in stacking mode in my setup, and I want to upgrade them to a higher level firmware. Is it recommended that I remove the ...
2
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1answer
839 views

Enabling SNMP traps for Switch Crashes - 3750 stack

We recently had an issue where one 3750 switch of a stack crashed due to a slow memory leak. The slow memory leak has been resolved but we'd like to be notified of it by SNMP if it happens in the ...