Questions tagged [switchport]

For questions about switchports on network devices. For instance, you want to configure a trunk on a router interface or you are wondering how you setup an interface on a switch for a server.

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NX-OS switchportort meta tags

I believe i once stumbled across an NX-OS feature which we currently need, but for the sake of it, i can't remember the details like platform (100V, 5000, 7000) or version. We are currently using 5600'...
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41 views

Why Access ports should have the same trunk native vlan? [closed]

In the current switch Management VLAN is 48. Can you please someone explain it to me, why we dont give trunk native VLAN as 48, and we configure the same as access VLAN? Thanks in advance.
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66 views

Why STP has to be disable on Trunk Ports?

I have 5 Switches on a Private Network 10.0.0.0/8 with 8 Vlans. On Access ports is running Rapid STP. On Trunk Ports between Switches should i disable STP or not? I would be very pleased if someone ...
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1answer
75 views

Port Channel Hybrid Port Issue

I have a Dell Sonicwall NSA 4600 running the latest firmware with an Interface that's configured to have a secondary redundant port. This interface also has a VLAN sub interface assigned to it. On ...
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3answers
65 views

JunOS, access mode interface asks for a vlan

I'm kinda new to networking so I'm going to do my best to try explain my issue. The issue that I have is that I want to delete all default configuration for my xe interface. Current configuration: ...
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1answer
58 views

Best Practice for Voice and Data VLAN on single port

We have multiple interfaces currently configured with the below on our Cisco 3750x switch. interface GigabitEthernet1/0/21 switchport access vlan 4 switchport trunk encapsulation dot1q switchport ...
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1answer
18 views

Does the dot3StatsInternalMacReceiveErrors counter include Vlan mismatches

I am wondering if the dot3StatsInternalMacReceiveErrors counter includes VLAN mismatches, i.e. Discards due to VLAN mismatch. http://oid-info.com/get/1.3.6.1.2.1.10.7.2.1.16 only explicitly lists ...
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2answers
49 views

What's the `line protocol` and `Link`?

When I show a switch interface information, there are line protocol and Link: Switch-A(config-if)# show interface gigabitethernet 0/3 Gi0/3 up, line protocol is up (connected) Bridge Port Type: ...
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2answers
76 views

Obtaining packet switch-port information via a mirrored port?

When sampling a mirrored port of a switch, is there any means of determining the switch-port information of the packet? Since Ethernet packets do not contain this information, I assume the answer is ...
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104 views

HP switch “No untagged port”

A network engineer showed me the show vlan output of an HP switch. I know tagged ports are trunk and untagged ports are access in Cisco terms. But can anyone explain the "no untagged port"? How is ...
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3answers
77 views

Switch syntax, vlanXX and vlan [space] XX

How does a switch OS know that this is the same syntax? There are certain commands where you might reference the vlan like so "switchport access vlan 35", (a space between vlan and the number) and ...
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1answer
620 views

MAC Address learning process

Does a switch learns hosts mac address in these following scenarios: Switch port configured as access and frames received tagged on different VLAN Switch port configured as trunk and frames received ...
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57 views

Block internet on a Cisco catalyst 3560 port

Good day Is there a way to block a specific port in a Cisco Catalyst 3560 switch to block the user from accessing the internet but still have full access to the internal corporate resources. The ...
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1answer
47 views

The Egress to switch port is direction a or direction b?

I have a doubt about the switch port Egress direction and Ingress direction. you see the upper have Egress rate limit. I want to know the Egress to switch port is direction a or direction b?
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1answer
393 views

When are Native VLANs used? Are there times when a Native VLAN will never be used?

This is probably a simple one, but I am very new to VLANs. I'd like to avoid using VLAN 1 as well as gain a better understanding of when native VLANs come into play when setting up a switch. On ...
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1answer
29 views

When the data pass the Switch in port can represent cost value?

The snapshot is a tutorial of Switch. You see the bellow snapshot, from the ROOT SW1 node to SW3, there are two path: the author says the the path1(left side path) cost is 0 + SW3-in-port. the path2(...
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1answer
52 views

How can I config multi switch port efficiently?

I have a Cisco 2960-24TT Switch, no I want to shutdown all the switch port, I have to enter the interface then execute no shutdown and exit it then re-do this steps. how can I config multi switch port ...
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2answers
82 views

How does a Layer 2 Switch know which port is a neighboring switch port and which port is connected to a host?

I want to know what is the mechanism behind a switch, so that it understands which of its ports are connected to a host (end device), and which of them are connected to another switch? Imagine trunk ...
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511 views

Can all ports on nowadays switches act as uplink ports? [closed]

I basically know nothing about networks (I just learned what switch meant yesterday), and English is not my first language but I hope I can make my question clear. So I just moved into a new house, ...
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2answers
480 views

HP ProCurve 2524 - CLI Command to find Fiber Transceiver's Serial Number

Is there any cli command allowing to check the serial numbers of the inserted mini-GBIC modules on a HP J4813A ProCurve Switch 2524? The show interfaces transceiver [PORT-NUMBER] command which works ...
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1answer
321 views

Cannot ping or SSH into new Catalyst 2960-CX switch from the server VLAN (1)

I recently setup a Cisco Catalyst 2960-CX switch at work (I'm a SysAdmin at a SMB). Our workstations use VLAN 3, but our servers use VLAN 1. The management IP of the new switch (in VLAN 3) is 192.168....
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2answers
208 views

What is the springing mechanism for on the top of this transceiver module?

Some Ethernet SFP modules have them, some do not. What is the yellow springing mechanism and the attached metal wire meant for?
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0answers
154 views

HP 5500 JD374A Port naming convention

Hi to all :) To most of you it'll prolly sound like a very silly question to ask, however to me as a fresh network trainee the answer is unfortunately not so obvious. So, the question is whether the ...
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1answer
92 views

What requirements must general firewall/routing software meet, to make OSI 2 port mirroring work correctly?

The basics are obvious, but there are technical points of networking implication which I don't understand. Some of these are general to networking, others general to all routing/firewall softwares ...
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2answers
951 views

Can VLANs with same no but on different switches communicate with each other?

If i have a VLAN (say VLAN 10) on switch 1 and again a VLAN 10 on switch 2. Can the hosts on these VLANS communicate with each other?
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1answer
173 views

Save switch config in USB

I want to save the configuration of an Avaya 4850GTS-PWR+ switch in a usb stick So I plug the usb in the switch Connect to the switch via putty using the Serial port in my laptop to the RJ45 Console ...
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1answer
366 views

L2 transparent firewall between router and switch running 802.1Q trunk mode [closed]

Router port facing to Core switch is running trunk mode allowed vlan 200 & 300. I am placing a firewall between the trunk connection. Can I set the firewall as L2 transparent mode or I need to ...
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1answer
75 views

L3 routing between switches with some VLAN's trunked

During a migration various L2 equipment will be replaced with all Cisco L3 switches and over time traffic migrated to routed subnets instead of trunked. There are two straightforward approaches that ...
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1answer
181 views

Broadcasting in L2 Switch

Hey guys, This is a Noob question. When a broadcast frame is received on a switch from a specific port, will it be automatically destined to all the ports in a switch ? ---------- (or) ---------- ...
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1answer
57 views

Auto smart ports macros triggers

My question is simple: I have a Catalyst 3560-X series switch and the below macro applied when i connect my laptop to the switch and it's working fine . function My_laptop_func() { if [[ $LINKUP == ...
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3answers
2k views

Connecting two switches with an access mode port

I manage a switch, and I saw that on one interface there were 19 different MAC addresses, all of them on the same VLAN, so I guessed that there was a switch connected to that interface. Since all MAC ...
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1answer
290 views

Switchport negotiation between trunk and dynamic desirable

If two switches are connected, one with switchport mode trunk and the other with switchport mode dynamic desirable, will both switches form an operational trunk?
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1answer
58 views

Help in Identifying the components in the below picture?

One of my friends send me this picture asking me whether I have any idea what the device on left of modem box, which is connected to two COM ports. He thinks I am smart. I will break to him I am not, ...
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1answer
667 views

Configure VLAN on Cisco SG-200 switch connected to a Meraki switch/network

I have a Cisco SG-200-26 switch connected to a port on a Meraki switch. The Meraki switch shows a list of all devices detected on that switch port (the Cisco switch and all of the devices connected ...
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1answer
136 views

Newb question, about LLDP for inventory

New (to enterprise networking) guy-- My org is facing room re-numbering of a 5 building, multi floor campus, wherein all nodes (PCs, printers, A/V) will need to be renamed. Wondering if, after the ...
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3answers
96 views

can i check the ip of the machine attached with the network switch port from the switch console

can i check the ip of the machine attached with the network switch port from the switch console? I just wanted to get the IP address of all the attached devices by running a simple command in switch ...
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1answer
967 views

Why HP comware shows “ARP limit exceded”?

%Apr 30 11:32:06:216 2000 ICT ARP/4/RATELIMIT: The ARP packet rate(178pps) exceeded the rate limit(50pps) on interface GigabitEthernet1/0/24 in the last 60 seconds. %Apr 30 11:33:06:824 2000 ICT ARP/4/...
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3answers
1k views

Forwarding to multiple output ports using SDN

Using switches that support OpenFlow, is it possible to forward packets for specific flows to multiple outgoing ports, so that each port receives a copy of the packet (similar to multicasting scenario,...
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1answer
623 views

Cisco, No dot1q tunnel mode on switchport

The problem is: I can not find a QinQ(a.k.a. double vlan tagging or dot1q tunnel) feature in the following cisco switch: WS-C4510R+E, SUP8-E with WS-X4748-UPOE+E line card installed. The Cisco ...
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2answers
77 views

Utilization of ports on switch

I have two WS-C3560E-48PD switches in the same organisation. How can I know which ports are utilized on the switches, and PC, phones, and printers? Is there are some command used to know above issue?
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1answer
752 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
793 views

Single out switchports with multiple MAC addreses

Finding out how many devices are connected to a single switchport is easy on a non-stacked Cisco network switch with a sh mac add ta or sh mac add int fa/gi/eth. In our enterprise we have many large ...
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1answer
497 views

Isolating ports on a Cisco Catalyst 2960-X Switch

I'm a bit of a newbie when it comes to networking, so excuse my ignorance for asking this. I did try to post this on the Cisco support forums, but kept getting told it was spam haha, so I hope this is ...
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2answers
239 views

How does a switchport learn a MAC address

I have a very basic question. How does a switch port learn a MAC address? In this scenario say a host is not trying to communicate with any one. It is just plugged in the switch port. Does the host ...
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2answers
101 views

Locating device with IP address

I have a list of old IP addresses of devices, they need to be switched to a new IP scheme. At each switch in the company there patch panels that patch to the switch. The patch panel is labeled with ...