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Questions tagged [cisco-catalyst]

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

4
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1answer
63 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 ...
3
votes
2answers
62 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
vote
1answer
38 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 ...
0
votes
2answers
51 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, ...
4
votes
2answers
109 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
votes
1answer
67 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-...
4
votes
2answers
51 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....
3
votes
1answer
216 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 : ...
0
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0answers
31 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-...
2
votes
2answers
171 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
votes
1answer
43 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 ...
1
vote
1answer
129 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 ...
1
vote
2answers
90 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 ...
0
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0answers
86 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
votes
1answer
50 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 ...
0
votes
1answer
78 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 ...
1
vote
1answer
68 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 ...
2
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0answers
45 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 ...
0
votes
2answers
45 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
votes
1answer
68 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 ...
1
vote
1answer
553 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
votes
1answer
205 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
votes
1answer
496 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
votes
2answers
69 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
votes
1answer
148 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 ...
1
vote
2answers
558 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 ...
3
votes
1answer
1k 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 ...
0
votes
1answer
558 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 ...
1
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0answers
37 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
votes
1answer
245 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. ...
4
votes
2answers
120 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
vote
1answer
3k 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 ...
1
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0answers
28 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 ...
1
vote
0answers
50 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
votes
1answer
331 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 ...
1
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0answers
67 views

Cisco stacking - priority and number information

In case of switches stacking, where are stored the information about the switch number and the switch priority ? After a reset, these information were conserved.
3
votes
2answers
4k views

Port channel to two different switches

We had a technician move one of two port channel links from an old switch to a new switch before telling anyone. This left the new and old switch both connected to different links of the same channel ...
5
votes
0answers
407 views

How to break apart an IPv6 /56 6rd delegated prefix from ISP into multiple /64 VLANs for use with SLAAC EUI-64? [Cisco]

I have CenturyLink Internet service, and they have a 6RD IPv6 deployment where they hand out an IPv6 delegated prefix /56 block to me and allow me to use it as I wish. My Cisco ISR router receives the ...
3
votes
0answers
722 views

NetFlow configuration on Catalyst 4500-X

I have a problem with config NetFlow on 4500-X switch. This is NetFlow config flow record NFArecord match ipv4 tos match ipv4 protocol match ipv4 source address match ipv4 destination address ...
2
votes
1answer
67 views

Multiple cisco 3020 switches

I have 22 cisco switches in 6 racks (2+4+4+4+4+4). Inside a rack the switches are daisy-chained. The switch on top every rack is connected to the first switch in the first rack. +++++ +++++ ++++++ ...
2
votes
1answer
861 views

Configure Routing on Catalyst 3650 with LAN Base

I am attempting to configure routing on a Catalyst 3650 running LAN Base to meet a particular set of criteria. For context: the switch is being configured as part of a lab environment that will allow ...
5
votes
1answer
506 views

2960X Management VLAN

I have a Cisco ws-c2960x-24td-l running 15.2(2)E7 I have created a management vlan (500) and want to put the management interface (FE0) into it, however the "switchport" command is not available for ...
6
votes
1answer
196 views

Cisco Catalyst Line Cards - memory considerations

Do the Catalyst Line Cards (4500 and 6500 series) hold memory (kept after reload), or some other information independently of the Supervisor Card? I ask regarding a chassis reset process, in order to ...
1
vote
1answer
53 views

Cisco C3750G Power On Failure

I have been using my C3750G for a while now. It has been used normally and hasn't been exposed to any excess heat but for some reason when I issued the 'reload' command the other day the switch didn't ...
1
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0answers
231 views

how to configure per-vlan traffic shaping on catalyst 3560? [closed]

I have successfully configured VLANs and inter-VLAN routing. Now I want to be able to apply bandwidth limits to each VLAN, especially ingress (into the switch towards gateway) but possibly also egress ...
1
vote
1answer
42 views

netflow in unknown on my switch

I am using the 3750G catalyst switch and I want to configure netflow but when I put the first command it appears that netflow is unknown: invalid input detected when i'm using netflow
2
votes
1answer
514 views

MLS QoS to MQC conversion

Currently trying to convert MLS QoS to MQC QoS, I'm facing a problem. In MLS (3750), and auto QoS we have this configuration for INPUT QUEUES: mls qos srr-queue input bandwidth 90 10 So in input 90% ...
2
votes
1answer
256 views

cisco catalyst 3560 rate-limit on vlan is not observable with iperf

I have a dumbbell topology with two hosts and two switches. Host1 is connected to Switch1, Switch1 is connected to Switch2, and Switch2 is connected to Host2. To make things more interesting Host1 ...
1
vote
1answer
112 views

Constant DHCP Requests with Cisco vWLC and Cisco 3560 setup [closed]

I'm having an issue identifying why my Cisco vWLC with DHCP bridging is flooding my DHCP servers with REQUESTS. These requests are coming in well over 1000/min. My Setup is in a lab, I am running a ...
1
vote
2answers
63 views

Transceiver for MM links up to 2k

I have 2 links of 1.5 mm f.o mm c / u I want to know if a transceiver GLC-GE-100FX would work for me, why and what are its variations.