Questions tagged [cisco-catalyst]

A tag for questions related to Cisco's Catalyst line of switches.

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votes
2answers
4k 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 ...
5
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3answers
10k views

How to trunk VLANs over Layer 3 EtherChannel?

I am trying to setup a network that includes an EtherChannel link between two Cisco Layer 3 switches (Catalyst 3750). I am using a collapsed core hierarchical network. The picture above is my ...
1
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1answer
720 views

Excessive "Failed to read module serial eeprom" on Catalyst 4507

I have a plethora of these messages %C4K_CHASSIS-3-LINECARDSEEPROMREADFAILED: Failed to read module 5's serial eeprom, try reinserting module on my Cisco Catalyst 4507R. Thing is, there's nothing ...
4
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2answers
369 views

Aggressive UDP flows

I am reading about the DBL feature on the Cisco 4500E which protect the buffers from filling up with traffic that is identified as nonadaptive or belligerent flows such as aggressive UDP flows. Since ...
3
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1answer
272 views

Vlan through ISR - Catalyst - Nexus doesn't work

I try to create a Vlan that route traffic through multiple Cisco Devices. For that I create a vlan13 on each device and setup a IP on the ISR and the Device attached to the Nexus also have a IP on the ...
4
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1answer
5k views

Create a internal connection between ISR 4451 and EtherSwitch submodule

In a Cisco ISR 4451 we install a EtherSwitch 48 Port Module. The ISR is working and the EtherSwitch Module too. Now I want to create a route from ISR to EtherSwitch and read some Manuals and Forum ...
1
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1answer
85 views

Cisco 3850 Input Current

I am trying to determine what the labeling on the back of one of our Cisco 3850 switches means. We are seeing 12-6A on the back of the power supply, and I've pinned it down to be the Input Current ...
5
votes
2answers
683 views

Can a broadcast storm do physical damage to computers and networking hardware?

We had a broadcast storm that went undiagnosed for several hours. After the problem switch was unplugged and traffic returned to normal, we had a handful of machines and switches that were broken. On ...
5
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1answer
6k views

When and where to use Spanning-Tree (Portfast)

The tl;dr, in which scenario (switch-to-host, or switch-to-switch) do I use spanning-tree portfast or spanning-tree ...? We had a catastrophic network outage today. My first question to my boss was "...
2
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2answers
489 views

Manually set combo interface for RJ45 Cisco 3560-CG Series

I have a Cisco Catalyst 3560-CG that has two combo ports with SFP and RJ45 each. Is it possible to manually set the combo port to use the RJ45 only? If so, how is it done? I am troubleshooting a ...
3
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1answer
3k views

Can you SSH to a Cisco switch without a Username

Is there a way of setting up a Cisco swtich (Cisco Catalyst 3850 12 Port GE SFP IP Base - its not arrived so I don't know the IOS) to allow SSH without specifying a USERNAME The customer currently ...
1
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1answer
246 views

Access port config

Having read several of the posts here on access port commands, I'm wondering if I have created myself an issue. I've been running my current MDF config for some time without problems. I'm trying to ...
6
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3answers
200 views

Lab: I need to determine information about a device on a specific port of a Cisco multilayer switch

I have a Cisco Catalyst that has a port that is up up, and the device does not show in the ARP table. The MAC address-table shows a MAC address for the port. What can I do from that switch to find out ...
3
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1answer
93 views

MAC addresses of hosts that violate port-security

Do hosts that violate port-security show up in the mac-address table, or is this only in the logs? What would the log entry look like that has the violating address? We're on Cisco 2960X.
2
votes
1answer
998 views

Best way to setup VRRP if a router fails

I'm doing my VRRP networking lab. My understanding is if the Master failed then Backup will take over. In this scenarios, I have two layer 3 SW are connected together over LACP, and these two layer 3 ...
0
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4answers
500 views

InterVLAN Routing Plan

My network currently has 7 VLANs (2 user, 1 voice, 1 server, 2 wireless, and 1 for our networked A/V equipment). All of our switches are layer 3 Cisco Catalysts. However, we currently have a router-on-...
0
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1answer
507 views

C4510RE terminated abnormally

Hi I am unboxing 2x cartons of C4510RE chassis and find this booting up fault consistently appearing in both chassis. Has anyone encountered this before? Please find below logs: Cisco IOS Software,...
2
votes
2answers
2k views

Cisco 3560 interface counters, are the counters reset automatically?

I have a Cisco 3560G switch. Are the interface counters reset automatically, recalculated in a specific interval (5 minutes?), or not at all? I want to get (hourly, daily, monthly, etc) interface ...
2
votes
2answers
456 views

VLAN on Layer 3 Cisco C3560

I am looking to get a layer 3 Cisco switch and I know how to setup vlans, I will have the internet connection coming in from the pfsense router on port 1 and then vlan 10 on port 10 and vlan 20 on ...
4
votes
1answer
637 views

Random DHCP clients do not accept Cisco Catalyst DHCP server's offer

I have a central Cisco Catalyst 3750-X that acts as the DHCP server for all VLANs that need DHCP. Three VLANs need DHCP: 81, 100, and 111. I have had no issues with DHCP on VLANs 81 and 100. However, ...
2
votes
2answers
1k views

How to define a static route from LAN device through IPSec endpoint to Peer

From a PC that is attached to a Cisco Catalyst 3850 and Portchanneld to Cisco ISR I do a ping to a destination that is connected with BGP. That works for me. The trace path looks like: 1: localhost (...
2
votes
3answers
640 views

Does Catalyst 4500x-16s support 10/100 network devices?

Does 4500x-16s support 10/100 network devices? My vendor says that it is not able to and one of my devices can only support 10/100.
0
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1answer
605 views

how to enable normal traffic forwarding on a "destination" interface in a SPAN/mirroring session

Assigning an interface as "destination" for a SPAN/mirrroring session will disrupt normal traffic forwarding on that interface. I want to continue sending and receiving traffic on the destination ...
2
votes
1answer
3k views

Auto Voice VLAN on Catalyst 2960X running IOS 15.2(2)

I am looking to reproduce a configuration that I have quite easily achieved on the Cisco Small Business Series SG500 family of switches. The configuration is for Auto Voice VLAN, triggered by CDP and/...
1
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3answers
6k views

Disable DHCP on a 2960x?

I must start this by saying I am quite new to the IT scene. Also, I am very new to cisco switches.. I have been tasked to find out information on disabling DHCP on the cisco, and instead have the ...
1
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2answers
2k views

Is it possible to enable jumbo frame only on some interfaces of CISCO WS-C2960X-24PS-L

We want to enable 9K jumbo frame on CISCO WS-C2960X-24PS-L switches, however I found this line in the documentation and it made me confused and concerned because it involves reset and reload of switch ...
2
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5answers
1k views

Put hosts in own VLAN on the same switch and be able to ping hosts

That title is kind of cluttered so let me try and clear it up. My equipment: Two IP Codecs (I'll just refer to them as hosts from here on out) Cisco 3560-x Catalyst Switch The problem: I work in ...
2
votes
1answer
260 views

Correct 1921 Router to 2960 Switch Configuration for an External Connection

Sorry for the newb question, I am trying to figure out how to best link up an subinterface on a Cisco 1921 router, with an external network, by connecting the router and the cable from the external ...
1
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1answer
117 views

what type of fiber SFP for cisco 6500 Gbic module

I have an old 6500 with 6516a GBIC module (picture) and im planning to do some testing with it. I've already looked over Cisco's product page, and im still having a hard time identifying what SFP ...
1
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1answer
1k views

How do I upgrade the IOS for a couple of Cisco Catalyst 3500 Series XL 48 port switches (via CLI)?

How do I find the correct (.bin?) file on the Cisco website? I searched for "C3500XL" (from the show version output as shown below) and was presented with Cisco Search Results ... but the links don't ...
3
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2answers
159 views

VLAN for hosting environment

We have 2 (main) vlans: Vlan1 - Management (iDrac, switches etc) Vlan2 - Hosting, both servers and dedicated client IPs We have over 900 IPs in the VLAN2 which is located in a data center, for ...
1
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2answers
7k views

What are "Excess Defer Frames" on a show interface gix/x/x controller output?

I have a switch that is counting "output errors". A "show interface gi1/0/46 controller" shows up "2963657 Excess Defer frames" but I really can't find any documentation about "excess defer frames". ...
1
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1answer
684 views

What is the max throughput I should expect a Cisco 3560-PoE to have for a small network?

I have a Cisco 3560 48-PoE. I am trying to use it for imaging computers. I can make it work but I only get 1gb a minute. I have tried various tweaking but that's about has high as I can get. What ...
1
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2answers
8k views

Reserve an IP for client on Cisco DHCP server

So I thought I knew how to set up my DHCP Server on my 3550 switch and reserve IP's for clients. I go into the pool I need to reserve the IP in, but I do not have the address command as an option to ...
1
vote
1answer
349 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. ...
2
votes
1answer
791 views

Question regarding MTU settings on a Cisco 3750X Switch

I have a Cisco 3750X switch stack (2 switches stacked) and have a Compellent and three Equalogics as well as three VMware hosts directly connected but separated via different vLANs on this switch. The ...
1
vote
3answers
647 views

Untagged customer traffic inconsistently sent over trunk

I have a catalyst 3750 which is giving me a headache. I have several "customers" who all produce an identical mixture of tagged and untagged traffic. I want to take this traffic in and then pass ...
0
votes
1answer
106 views

DHCP behind catalyst 3750 POE-48 [closed]

I'm a database developer that inherited and managing an environment, we recently got disconnected from our parent company. Anyway we got couple of ESX servers, physical servers and we're having ...
1
vote
2answers
613 views

Confirm QoS Cisco 3650

I'm testing some Cisco 3650 switches with Cisco VoIP handsets and using auto qos. Is there a way to see if qos is kicking in and prioritising the voice traffic? Tried looking through the cli and can't ...
1
vote
1answer
1k views

HSRP on switch interfaces

As part of my internship/thesis, I am looking to implement HSRP in a network. The network has 2 separate locations that are connected with a fibre cable (layer 3 to layer 3). Each layer 3 (Cisco ...
7
votes
3answers
766 views

New VLAN across multiple Cisco switches

I have setup a new VLAN on my corporate network for use for guests only. I am trying to setup a guest WiFi service and keep all of the traffic separate from the business traffic. So far I have ...
2
votes
1answer
3k views

how to configure Cisco 3750 switch with Avaya IP Phone

current configuration is that in my office we are using netgear GS switches which are configured as VLAN1 and VLAN2. VLAN2 is for Voice. We have a Avaya Ip Phone System on a 192.168.200.XX. The ...
2
votes
1answer
71 views

Lab: I am running 15.1 on a catalyst and need to disable redundant supervisormp

I am trying to find a way to disable the redundant supervisor mode in my switch, as it is disabling another line card, so it can have enough power to spare for a redundant slot I wont use. I have ...
1
vote
1answer
725 views

Cisco catalyst and Juniper SRX240 vlan routing

I think my understanding of Trunking is off. I have two cisco switches under two vlans, connected to a single SRX240. I have connectivity to the SRX from the switch but not anywhere past it. The ...
3
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2answers
438 views

Can't ping Linux hosts on a certain subnet unless core router pings them first

We are making some changes to our network and after changing which router we use as our core router, there is a strange problem. The problem is that there are two subnets (out of a total of more than ...
1
vote
1answer
78 views

Cisco 9971 connected to Cisco 3550

I have a Cisco 3550. I wanted to connect a 9971(used) to it, but it is not going beyond POST. I see the keys blinking but nothing happens after that, and this happens in a loop. Could that be a ...
6
votes
1answer
983 views

What should a device do with an Ethernet frame larger than its MTU?

When I test with Cisco 2960 series switches or with ISR routers, then if port receives an Ethernet frame larger than its MTU value seen in sh int output, then device drops this frame and increases the ...
1
vote
1answer
2k views

Setting system jumbomtu on Cat 6500

We have an L2 path between a tape drive and a NetApp. The path goes through 3 switches (a 6509 and two N5K) but the two devices are on the same VLAN. All 10 gig fiber. I found out that while most of ...
1
vote
1answer
390 views

Ping to radio links attached to port-channels interfaces

I have a L2 port-channel, up and running, between two Cisco switches 3560 and 3750E. Traffic is load-balanced fine by src-dest-ip, but I have one problem: I can't ping the radio links connected to ...
6
votes
2answers
9k views

Should I disable STP on my access ports?

I'm going to replace some old "central" access switches to some Cisco Catalyst 2960X, and I'm not sure what to do on their STP configurations. For this network, we have some "central" access switches,...

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