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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Propagating Static MAC Addresses

I have a situation where I need to place a static MAC on a switch as the server in question does not generate any outbound traffic. This static MAC seems as if it will work for hosts on the same ...
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Flapping MAC address issue on the uplink routed port

The scenario is like, in my VLAN 30 network, randomly one device stops communicating and when I check the Cisco L3 Stack switch, it shows the following error messages: Jul 27 13:59:55: %SW_MATM-4-...
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Huawei switch mac address sticky (model S5720) persistence after power cycle

Suppose I configure the commands "port-security enable, port-security mac-address sticky" in a Huawei switch port, then an endpoint device is connected on the switch port, and a MAC address ...
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Show ports in use on Catalyst 3570

I picked up a used C3570 and am new to IOS. I am trying to ask the switch to show which ports are in use. My searches lead to the command "show modules" but that's refused by the switch (...
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Can use virtual port as the port mirroring's destination port?

Port mirroring can mirror several source port to a destination port(mirroring port). I have several questions about port mirroring. in the dest port, how to differentiate the different source port? ...
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Tagged frames onto untagged (access) port!

have been trying to understand ingress behaviour on untagged port, specially w.r.t tagged frames. On going through ieee 802.1q doc, i found this (8.6.2) : "Each Port may support an Enable Ingress ...
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32 views

Sending tagged traffic to untagged port?

What happens when an untagged port receives tagged frames, whether they are dropped or not !?. Say, A computer is connected to a switch on untagged port (as most would recommend). On it I have used ...
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2answers
65 views

ping in the same VLAN with multiple switches in between

Refreshing VLAN knowledge with PT7.3, I came across some unexpected behavior. Why does a chain of switches having proper trunk configuration between them DROP packets? Trying to ping hosts from the ...
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1answer
55 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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48 views

Packet Processing Limitation of OpenFlow Pipeline in Hardware Switches

I have a 10Gbps network containing 2 servers (DellPowerEdge 4700r) and a hardware switch ( ARUBA 2930F) in between. The two servers are connected via 10G SFP+ ports to the switch. I send TCP traffic ...
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149 views

How to find out which port is located on a switch physically

I'm trying to physically located a port on a switch. I know which port the mac address is connected to. The port is Gi2/0/14. But this is part of a stack. How do I know which switch this port belongs ...
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1answer
57 views

What are network port maps and what are they used for by the networking team in an organization?

I am curious to know what information generally the port maps contain.
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dhcp client not receving the ip address using two switches

1) In Router 4(R4) i have configured the 2 dhcp pool. first dhcp pool with ip address 150.10.10.0/24 and second one with 150.20.10.1/24 in subinterfaces f0/0.1 and f0/0.2 and encapsulated using (R4(...
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85 views

Connecting DELL N1548 to HP Core switch with LAN

I currently have a setup with a HP core switch with few VLANs configured on it e.g. vlan 10, 20, 30, 40. However when I uplink my DELL N1548 to the HP core switch, I cannot connect anything behind ...
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Are there any of NX-OS switchport “meta tags” alike features?

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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1answer
62 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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1answer
791 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
198 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
416 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
398 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
33 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
599 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
80 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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2answers
825 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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107 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
683 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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103 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
142 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
662 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
32 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
58 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
113 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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1k 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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3answers
2k 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
583 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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231 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
220 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
99 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
1k 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
297 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
482 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
109 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
234 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
65 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
3k 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
365 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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60 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
776 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
154 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
104 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 ...