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Questions tagged [cisco-catalyst]

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

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64 views

What does the Cisco HTTP client (help to) do on a switch?

While checking for vulnerabilities in one of our Cisco switches I came upon this: CVE-2019-12665. Excerpt from the CVE: A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software ...
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1answer
31 views

N2K-C2248TP-1GE question

We are working with Cisco 2960 and Cisco 4948 switches as our top of rack switches and we want to purchase some N2K-C2248TP-1GE , and connect N2K-C2248TP-1GE to our edge switches, (our edge switches ...
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1answer
46 views

Vlan Command Issues on Cisco Switches

I'm new to cisco equipment. I have GNS3 emulating an L3 switch whose image is "i86bi-linux-l3-adventerprisek9-15.5.2T.bin". I want to create a cable network with 802.1x and vlan authentication. For ...
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1answer
38 views

`no ip bootp server` appear in `sh run`

My understanding on Cisco devices is if we put no command in the config mode, that particular line will be gone from sh run. But I notice there is specific line in sh run with no ip bootp server ...
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1answer
42 views

VLAN Across Trunked CISCO 2960-S Switches

With reference to the above diagram: Is 10.124.124.141 supposed to be able to ping 10.124.124.161 if the setup is correct ? There is no router in-between, the idea is that the VLAN 215 spans two ...
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30 views

Cisco HSRP tracking option

I'm trying to setup hsrp to track a couple of interfaces in my cisco packet tracer lab, but I can't seem to be able able to choose the decrement value that I want (which is 50) and I only get the ...
2
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1answer
158 views

Migrating Configuration - 3750G to 3750X

What is the best practices to migrate configuration from an older Cisco switch model to a newer Cisco switch model? -I am not expecting to change any configuration, just simply want to be on the ...
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2answers
126 views

Why does yealink ip phone is not getting ip address from voice vlan?

I have configured separate vlan for voip and connected interface to it (as shown below). But the phone is not getting ip address automatically. switch- cisco 2960-x phone- yealink I had tried: (on ...
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2answers
137 views

Cisco 3750G - SSH Diffie Hellman Group 1 SHA1 Error

I recently implemented SSH configuration on my 3750G switch stack. I have -set the domain name -generated the rsa key using 2048 bits -ensured that the vty lines are set to transport input ssh Now ...
3
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1answer
114 views

Switching interface VLAN ID Mid-Production

I was wondering if there was a way to switch out the VLAN ID from VLAN1 to VLAN10 without impacting the connectivity of the end users? Can I simply copy and paste from one interface VLAN to another? ...
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53 views

Cisco Catalyst QoS queuing model

How Cisco Hardware queuing model (like 1p7q4t for Cat6800) are related to traffic classes (class-map) ? How assign the X traffic class to Y hardware queue ? Also, if only 6 classes are configured, ...
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2answers
167 views

Should portfast be configured on the physical interfaces or on the logical port-channel, or both?

I'm using a Cisco 3750 switch and have two physical ports configured in a port channel that connects to a router. Should I configure spanning-tree portfast on the physical interfaces or on the port-...
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24 views

scp timeout from windows to linux on large files

I have a windows desktop and a linux server. I normally SSH into this server and haven't seen an issue before. Today I tried to scp files from my linux server to the windows desktop. This was ...
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2answers
42 views

Multiple 802.1x clients, single port support on a Cisco 3750 switch?

I'm thinking of using our Cisco 3750 switch with our RADIUS server for 802.1x authentication on our Ethernet ports. If I enable 802.1x and a user connects a switch to their Ethernet jack, and the ...
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1answer
31 views

Getting Mulitple Source IP addressess when doing Port Monitoring

I have a Cisco 2960 switch that I'm trying to find which device IP address is connected to each port... My Setup: monitor session 1 source interface gigabitethernet 0/5 monitor session 1 destination ...
4
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1answer
216 views

Deploying Virtual Stackwise Catalyst 9400

I am looking into deploying Virtual Stackwise on the Catalyst 9400 series switches. I wanted to know based on best practices where should the VSL links be deployed on the Sups or the modules? Is there ...
4
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2answers
349 views

Trust dscp command missing on cisco 3850

We have an incoming QoS configuration on our 2960X switches like this: class-map match-any QOS_GL_TRUST match ip dscp 8 16 24 32 46 class-map match-any QOS_GL_CITRIX match access-group name ...
1
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1answer
91 views

QoS - Add DSCP EF tag with L2 switches?

Here is the topology that I have: Phone => (access port) L2 Switch (trunk) => Router My goal here is to add an EF tag to the packets coming from my phones. Basically, if a packet comes in being in ...
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2answers
68 views

Cisco Catalyst pseudo interface?

I think I remember reading somewhere that you could have multiple VLANs assigned to a single interface by way of a pseudo interface. Googling with that vocabulary doesn't return proper results though, ...
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2answers
1k views

VLAN Interface is down, protocol is down

I have Cisco Layer 3 switch with IP routing enabled on it. I have different VLANs configured on it and its working perfectly. Now i have added another VLAN (SVI) and assigned that VLAN to one of the ...
2
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1answer
357 views

Cisco QoS trust and cos-dscp dscp-cos Mapping behaviors

Regarding our current Cisco QoS implementation, to get a deeper understanding I would have some questions I read this: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/voice-over-wireless-...
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2answers
82 views

Control traffic between two switches

Two catalyst switches connected to each other and all ports of both are in VLAN 2. Ports that connect both switches are access ports (no Trunk) as both switches' ports are in VLAN 2, no any other VLAN....
4
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1answer
974 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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107 views

SNMPv3 traps on Catalyst 9500

with our new Catalyst 9500 switches we want to use snmpv3 to send traps. Thats what I configured: snmp-server engineID local 1234567890ABCEDF snmp-server group SG_SERVERFARM v3 priv snmp-server trap-...
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2answers
397 views

QoS for OSPF, VOICE and CRITICAL Traffic

I plan to implement the QoS policy below. The target is to garantee bandwidth to VOICE and CRITICAL traffic. It should be 1/3 for Voice and Video, 1/3 for Business Critical traffic, 1/3 for all the ...
2
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1answer
49 views

cisco catalyst creating user fails

I took over a couple of Cisco 2960x switches. They are configured with a telnet login. Now that telnet isn't that great (and my colleagues are afraid of CLI but might have to configure things too) I ...
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1answer
306 views

Cisco 49XX multicast flooding

I have problem with multicast on cisco 4948. I've got vlan 9 with muilticast, which configured on several ports. Switch floods multicast traffic on all ports configured with vlan 9. It consumes link ...
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2answers
274 views

HSRP limitations on Catalyst 3560

I have read all of the documentation so many times that I put myself into a headspin. Now the sentences I read don't make any sense. What exactly is the HSRP limitation on Cisco Catalyst 3560 ...
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113 views

Cisco QoS Queuing models

I would have a question about the Cisco Queuing models. For example, when we speak about 1p7q3t, or 2p6q3t, or others models, does it from hardware or software considerations ? If it's hardware, if ...
2
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1answer
120 views

4507r Supervisor engines aren't operating redundantly

The tl;dr : I have two supervisor engines in a 4507r but the standby unit doesn't appear to be ready to perform when the active module dies. On Sunday I had a network problem that appeared to be ISP ...
1
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1answer
166 views

Switch cannot ping server

My switch won't ping my server. Both are directly connected with each other, and are in vlan 666. When I initiate a ping from my switch to my server, the switch sends ARP requests. Then the server ...
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1answer
76 views

VLAN forwarding in cisco

We have a Cisco 3750X (L3) as a core switch and 10 Cisco SG-300 (L2), each Switch is in a separate VLAN (include core switch) now I want to define VLAN forwarding rule on my core switch, so all ...
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0answers
49 views

Switch problems: No loop, no damaged port, so what? [closed]

This is a medium size company. We have a 2960G switch as a core switch, which is connected to three 2960 series Cisco switches by fibers and clients are connected to these three ones. All of the three ...
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2answers
53 views

Is it possible to enable DHCP on multiple hosts via Cisco switches or routers? [closed]

I think I know the answer to this, but thought I ought to ask around. When setting up new networks with multiple hosts, like a university computer lab VLAN with 30+ workstations, for instance, is it ...
4
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1answer
90 views

CISCO IOS's feature Secure Shell Version 2 Enhancements for RSA Keys

I have a switch C3750V2-48PS with IOS ver. 12.2(55)SE5. I wanted to copy to it public key for the ssh client but I do not have following command available Switch#configure terminal Switch(config)#ip ...
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1answer
1k views

Output packet drops on Cisco 3850 switches

i am getting output drops on switch actually i have ethercannel bundleing 4 ports and those are connecting to our hyperV server. We have schedule mirror images to one of our another server everyday ...
3
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1answer
309 views

How to get per-process memory use from Cisco switches via SNMP

I'm trying to get per-process memory use from Cisco switches via SNMP. I've found an article suggesting you can subtract CISCO-PROCESS-MIB.cpmProcExtMemAllocatedRev and CISCO-PROCESS-MIB....
3
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1answer
1k views

How to solve a BKN* Port Issue on a cisco catalyst

There is a Cisco ISR 4451 connected with Portchannel to a Catalyst 3850 Stack and there are some VLANs enabled, but only one does not come up for a Portinconsistence. I figure out an Issue on the ...
3
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2answers
70 views

Possibility of using Cisco “port security” in sensor networks?

Is it possible to use Cisco port security (to prevent a host changing its Mac address) in sensor networks? In a more general question, is Cisco port security platform independent? Meaning that it is ...
4
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1answer
165 views

How to connect to a non VLAN Router device from a Trunk VLAN on a catalyst Switch

On a Cisco Catalyst 3850 Stack there is attached a Link to a Carrier who provide a few connections seperated with vlans (100,101,...) so I create a VLAN 100 on my cisco switch and setup a IP Address ...
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2answers
1k views

How to connect Cisco Catalyst 2960G using a RJ45 Console Port

Got a used Cisco Catalyst 2960G-24TC-L switch for studying networking and having a fundamental issue. As I new to networking, I'm trying to figure out what type of cable I need to use for connecting ...
2
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1answer
2k views

Default QoS Behavior on Catalyst 3650/3850 Running IOS XE 16.3.6

I am trying to better understand the default queuing behavior on Catalyst 3650/3860 running IOS XE 16.3.6 Denali. Is QoS enabled globally by default? Coming from working with Catalyst 2960X on IOS 15 ...
1
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1answer
944 views

Factory Reset Cisco 3560: Stuck in loop

I recently acquired a used Cisco Catalyst 3560 and I am trying to factory reset it. When I enter the recovery process (by holding MODE), I get stuck in this loop at the "switch: " prompt. How do I ...
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0answers
40 views

Stacking Switching [closed]

We do have 9 switches in stack , after IOS upgradation only on switch came up but remaining switches are down , can you please help me how to troubleshoot this problem ?
3
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1answer
355 views

Fix our Cisco switch overwhelmed by console logging

I have a setup with dual redundant Cisco catalyst 4506-E using the WS-X45-SUP8L-E supervisor engine and two 48-port switches below it. My task is to access and modify the switch configuration. ...
5
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2answers
165 views

Cisco Catalyst ACL one-way initiated traffic

i am trying to setup ACL on my core router, i have the following networks: Data (192.168.32.0/24) Voice (192.168.42.0/24) Guest (192.168.100.0/24) QA (192.168.101.0/24) I would like the following ...
1
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1answer
5k views

Upgrade Catalyst 9300 stack without downtime

I have a pair of C9300-24T switches running as a stack and where all connections use symmetric LACP etherchannels. Is it possible to do a software upgrade without downtime? (Meaning that one side of ...
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0answers
34 views

Policy Map issue on c6848x 15.2(02)SY

I have a problem creating traffic shaping on c6848x. I need to set shaping on output interface to limit and shape traffic to 100 MBs. So far I did this: class-map match-any 100MB-OUT match any ...
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0answers
73 views

Why are multicast frames not showing in the SPAN session? (on Catalyst 2960) [closed]

I have a SPAN monitor session setup to capture both tx/rx on a port 9 (see below). And I can see the multicast count ticking up on port 9. But none of the multicast packets show up in the SPAN session ...
4
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1answer
428 views

QoS Policing vs Shaping, why policing

Regarding QoS, we have two modes: shaping or policing. The policing drops packets while shaping put the packets in buffer. Shaping seems to be the better solution in a general ways, so, why use ...