Questions tagged [cisco-catalyst]

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

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52 views

Cannot Create Subinterface on C3650 L3 Switch

We have WS-C3650-24TS Catalyst L3 switch. I am trying to create a sub-interface on the ports but cannot make it work as the following error shows. Is there something I'm missing? Sorry, newbie here.
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1answer
29 views

Stacked Cisco C9200 firmware upgrade

I am driving myself a little bit mad on this one. I am planning an IOS 16.12.04 upgrade (from 16.12.02) on two stacked Catalyst 9200 switches. These switches are located in Germany (I am located in ...
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1answer
21 views

test etherchannel load-balance command doesn't work

I am trying to learn the etherchannel environment but when I enter this command it gives an error. Switch#test etherchannel load-balance interface po1 mac 00d0.ba86.1e19 00d0.ba86.1e1a ^ % ...
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2answers
241 views

Cisco 2960x Stack IOS version mismatch

Hope some of you already have some hands-on experience with that - if you're adding a new switch to the stack and you get IOS version mismatch, can you still copy the bin image from the master to the ...
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2answers
31 views

transfer vlan from one cisco switch to an other through a central cisco switch

I can't figure out how to pass one vlan from one switch to an other: Let's say, I have 2 valns: Vlan 1 and Vlan 2 3 cisco switches: Cisco Catalyst 3560g (central switch) Cisco SG-300 (with native ...
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0answers
13 views

connectx-3 qsfp to cisco 6509 sup720

I have an hp connectx-3 ib/10gE card flashed to the 2.77 firmware[Latest i think], in the Ethernet port I have a HP Mellanox 655874-B21 HPE QSFP/SFP ADAPTER which goes to a MC3208411-T Mellanox ...
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2answers
78 views

Cisco Port forward ip nat inside source static … Invalid

This is almost the same question as How to setup port forwarding on Cisco Router running Version 15.2(4)M6. The problem is that the command used in the answer is not available: ip nat inside source ...
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1answer
2k 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 ...
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4answers
835 views

Configuring Ports on a Cisco Switch

I am very new to Cisco networking (haven't done any course either). I have been trying to learn a bit of networking myself and had no trouble in doing some of the basic stuff which i needed for my ...
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2answers
1k views

How do I enable port security on Cisco switch?

I have a Cisco switch model 3500 series 48 port. I need to enable port security on this switch. Could you tell me the configuration commands to apply this policy?
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2answers
121 views

Cisco 3570x stack behaviour

Could you please advise on following: We have two Cisco 3570x switches in a stack (switches have no Stack Power). What will be the behavior if: Master switch will be powered off. Will Slave reboot ...
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0answers
35 views

Private VLANs implementation

So, I have campus LAN, implemented as many VLANs with InterVLAN routing, that spreads on tens of L2 switches and one L3 switch. Now, I have request that hosts on one VLAN don't see each other. But, ...
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1answer
139 views

Best practice / advice for cisco 3560 behind Virtualised OPNsense

Currently I run the below scheme. The problem is that when ESXi is down it takes down all the network with it, so I have to boot up another router to log in to it. WAN > OPNsense (in ESXi)> ...
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2answers
422 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 ...
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2answers
310 views

Unable to ping between router and routed port on L3 switch. Why?

I've got an old Cisco 2811 connected to an old Cisco 4948 L3 Switch. I'm trying to teach myself a little more about L3 Switch implementation. All I'm trying to do at this point is get the router and ...
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2answers
2k 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 ...
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3answers
553 views

DHCP on CISCO 3850

I would like to configure the DHCP server on CISCO 3850, and reserve around 100 static IP for servers After doing research found that I need to create individual pool for each static maping like ...
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2answers
174 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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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 ...
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2answers
448 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 ...
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4answers
473 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-...
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2answers
1k views

How do I know the switch is layer 2 or layer 3?

Is it possible to find the switch is Layer3 or Layer2 in (Switch)CLI? Is there any command to check whether the switch Layer(Layer 3 or 2) in CLI?
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2answers
76 views

How to Change the Date on Cisco Catalyst 3750x Switch

We are using cisco catalyst 3750x 24 port switch series How to Change the Exact Date(Singapore) on a Switch ASW-G-L09-001#show running-config Building configuration... Current configuration : 11883 ...
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2answers
81 views

When do ACLs on SVIs get applied on Cisco Catalyst devices?

I don't understand exactly when an ACL will get applied when on an SVI. Given the following (pseudo) configuration int vlan 100 ip address 10.0.0.1 255.255.255.0 ip access-list in in ip access-...
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0answers
22 views

ASA ping outside to inside private ip's?

i am new asa and cisco as well , what i am trying to do to perform this lab , only 1 issue is there , i need help in it, i can ping from pc0 to router0 in other way I can ping inside to outside , but ...
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1answer
91 views

Cisco 9300 Stacking Issue — Link OK Yes, Link Active No

hopefully another pair of eyes can help me out with this. We have 4 Cisco 9300-24Ts data-stacked with all cables detected by the switches themselves. Switch order and priority looks good, however we ...
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1answer
48 views

How do I find out the thoroughput of a Cisco Switch?

I am trying to find out the thoroughput of our Cisco 2960 & SG300 switches. Is there a CLI code I can run to find this?
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1answer
2k views

intervlan routing with PfSense

I Need some guidance on getting my lab networking configured. Any support is appreciated. My Lab consists of: 2 cisco switches: 2960s(access layer 2) and 3750X(ip routing/layer 3) Xenserver with ...
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1answer
969 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 ...
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1answer
85 views

PortFast For Some Networks But Not Others

I have 4 offline self contained networks. They are setup as such: Network 1: Windows Server 2016 As Domain Controllers And Windows 10 (1909) Clients Connected by Cisco C9300-24Ps. Network 2: Windows ...
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3answers
30k views

Meaning of the ip default-gateway L2 switch

What is meaning of the ip default-gateway command on a Cisco L2 switch? I read something about it on the Internet, but there was written that it allows you to Telnet to the switch. I am little bit ...
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0answers
40 views

Cisco QinQ - More than one s-vlan on dot1q-tunnel for the same c-vlans

I have a scenario where I have 3 service vlans (10,20,30) from a trunk port and need to brige our customer vlans (100,200,300,400) between all the service vlans. I need to do it all in the same switch ...
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1answer
134 views

cisco switchport trunk native vlan

we have switch catalyst 3850 and we need to enable the PXE boot on a port configured in trunk with configured three VLAN (4040, 4050 and 4060). To permit the PXE boot and deploy to work we set on the ...
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1answer
58 views

QoS policy definition - Cisco guidelines vs reality

Currently designing a QoS Policy for a customer (Cat 4500 models), following the business needs, I will work on a 8-class based model definition. Cisco has several guidelines under this perspective, ...
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1answer
825 views

Link Aggregation from Cisco to Palo Alto using 10 gig interfaces, port on Cisco shows “waiting to be aggregated”

I am trying to bundle two 10-Gig interfaces on PA-3020 to Cisco Cat9300. Previously, I had bundled two Gigabit interfaces on same devices and everything worked fine. But now, when I try to configure ...
2
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1answer
108 views

Cisco C3750X power supply: difference between /1 vs /2?

What is the difference between the C3KX-PWR-350WAC/1 and C3KX-PWR-350WAC/2 power supplies for the Catalyst 3750X series? I have a bad power supply, and I can't remove the failed one right now to ...
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0answers
101 views

Cannot create connection between two routers in same VLAN via switch

I currently have a Cisco 2960-24TT switch (switch1) and a Cisco 1841 router (router1) that form part of my core network connecting other VLANs and devices. The two ports on router1 have been ...
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0answers
62 views

Cisco C3750 and PRTG netfllow

I have a core switch (backbone) of our network that broadcasts all the vlans to other switches. I am trying to configure netflow on the switch and link it up to a Netflow sensor on PRTG. I followed ...
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1answer
638 views

Why would you use port security mode “protect?”

Port security offers three violation mode options: • protect—Drops packets with unknown source addresses until you remove a sufficient number of secure MAC addresses to drop below the maximum value....
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1answer
266 views

Is it possible to use a interface of Catalyst on a ISR

We use Cisco Catalyst 3850 Switch (with Cisco One Foundation) as aggregation Switch for multiple Lines and connect it to a ISR 4451 for routing. Now we search for a solution to use the Interfaces of ...
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1answer
145 views

Segregated OSPF Networks, cross same physical path, how to segregate back out at other end?

I'm sorry for being basic in writing this question. I think the details have been covered though. What's happening here is, two separate networks are being brought into an isolated area over a ...
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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/...
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2answers
1k 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 ...
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1answer
1k views

Native Vlan Cisco Catalyst and Layer 3 switch

I have run into an interesting issue setting the native VLAN between one of my Cisco Catalyst 2960 and my Layer 3 switch (third party). Here is the setup, the layer three switch is set up to run on ...
4
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1answer
2k views

Cisco Catalyst 2960 X MAC access list

I am using a MAC access list on this switch, so I go about it by first creating the MAC access list: #conf t #mac access-list extended aclname # permit host XXXX.XXXX.XXXX any Then, I tie this list ...
4
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1answer
4k 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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2answers
5k 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 ...
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2answers
3k views

Why does a switch have more VTY lines than a router?

During my years working with Cisco equipment I realised that switches have more VTY lines (16) as compared to routers which have 5 VTY lines considering that the equipment that we work with (c2960 ...
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2answers
14k views

Remove interface VLAN 1 in cisco 2960 switch

From what I understand, there are protocols like VTP and CDP that no matter what will use VLAN 1. CDP and VTP are layer 2 meanwhile interface VLAN is layer 3. So, I wonder why I cannot delete ...
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3answers
215 views

Cisco Switching Lab

Could you please advise with some ideas on how to setup a Switching lab in a production enviroment without harming the Production ? Basically I need 3 Cisco Switches where I can try some labs but ...

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