It depends on the manufacturer. For Cisco switches:
Switch port configured as access and frames received tagged on
Frame is dropped
Switch port configured as trunk and frames received
tagged on non authorized trunk VLAN
Frame is dropped
Switch port configured as trunk
without native VLAN and frames received not tagged
Some Ethernet SFP modules have them, some do not. What is the yellow springing mechanism and the attached metal wire meant for?
Every SFP I have ever seen or used has some sort of mechanism for securing the transceiver into the SFP slot on a device. In the example provided by the OP, this is a spring mechanism that manipulates the catch and releases the SFP....
A switch simply record the source MAC addresses of frames ingressing on a given port. It doesn't care if there's a single host, or another switch connected on a port (for that purpose).
If a single host is connected, there will be only the MAC address of this host recorded for this port.
If it is a switch, then potentially there will be traffic from all ...
Yes, assuming the switches are connected together and VLAN 10 is forwarding on the connected ports. Both ports have to be configured the same, so that VLAN 10 is either tagged on both or untagged (native) on both.
The problem is not the traffic from the server to the switch, but the return traffic, from the switch to the server.
Since the VLAN is native, the switch will sent the traffic for this VLAN untagged, while the server expect it tagged.
So this cannot work as is.
You should probably use this VLAN only for PXE boot and configure your server Operating ...
A switch will learn a MAC address as soon as a frame enters the switch. It looks at the source address on the frame and adds to, or updates, its MAC address table with the interface where the frame entered the switch.
If you connect a host to a switch port, and the host sends no frames, the switch will not learn the host's MAC address.
For this particular interface, the line protocol is ethernet.
The Link Up/Down Trap is enabled message is telling you that the SNMP trap for when the link goes up or down, for whatever reason (admin up/down, cable inserted/disconnected, etc.), is enabled.
You should not disable spanning tree on trunk interfaces. In fact, STP needs to be on links between the switches, which should be the trunk interfaces.
You can also leave STP enabled on the access interfaces to prevent loops if someone connects two access interfaces.
Look at it this way: if the links between the switches are not running STP, and somehow ...
Yes, the openflow protocol supports the creation of flows with multiple actions, and each action can be to send a frame/packet out a certain port.
However, whether or not your openflow switch supports this is a different matter.
E.g. this Cisco doc states that only "output to a single port" is supported by version 1.1.5 of their Openflow agent on Nexus ...
This would entirely depend on the capabilities of the device and how it is configured.
The simplest way would be is if the device in question was configured for DHCP snooping/IP source guard. This will create a binding table on the switch that should be easily queried. As an example:
HOSTNAME#show ip dhcp snooping binding
MacAddress IpAddress ...
In the general case, you can't find directly the IP address of the attached device.
What you can find is the MAC address of the device, by looking at the switch mac address table.
This table list the mac addresses associated with each port.
Then you have to map the mac address with the IP address.
A way to do it is to scan the entire network. For example ...
vlan 35 is used to refer to the (tagged or native) VLAN with VID 35.
vlan35 is a named interface (or anything else you can name), usually a switch virtual interface (SVI) - the name may default to vlanXX but could be anything you choose. Note that Cisco devices don't allow spaces in names.
Even though these may commonly be used interchangeably, they are ...
802.1Q tagging allows you to run multiple VLANs over a single, physical link. With phones, often the normal PC client VLAN remains untagged (access VLAN) while the VoIP VLAN is tagged.
Using a DHCP vendor option to tell the phones to use tagged VLAN x is a good method to avoid configuring each phone manually. You should consider to limit this option to ...
The difference is, in the first example, your VLANS can span several switches. In the second example, the VLANs terminate on the router interface.
As an example, with the first configuration, you can have other switch ports on VLAN 10, 20, or 30. You can also have a second trunk port to extend the VLANs to another switch.
With the second configuration, ...
According to the Installation Manual, only USB 1.1 and USB 2.0 are supported, along with FAT and FAT32 file systems. If I were you, I'd try to find a USB 2.0 2-4 GB stick and format it with FAT32.
The switches feature a Universal Serial Bus (USB) port on the front
panel. Switch administrators can use the USB port to perform tasks,
previously performed ...
Enabling port security is extremely easy at its core. It gets more complicated with the options.
Enabling port security on a switch port is done with a simple command: switchport port-security
Cisco maintains documentation on its commands.
As QinQ is ISP feature the key was in Not in Use entservice license state:
show license all
StoreIndex: 1 Feature: entservices Version: 1.0
License Type: PermanentRightToUse
License State: Active, Not in Use, EULA accepted
License Count: Non-Counted
#(config)#license boot level entservices !
Just After ...
The Cisco interface range command is really a macro that allows you to configure the same commands on a range of interfaces, and they don't necessarily need to be contiguous.
spanning-tree portfast default
spanning-tree portfast bpduguard default
interface range GigabitEthernet1/0/1 - 24 , 35 , 48
description ACCESS PORT
switchport access vlan ...
show tech transceiver should work on the old Procurves, at least it does on the 2510 and 2600 series.
Somewhat newer Provision switches (2910, 2530, ...) support show interfaces transceiver [n] detail which outputs pretty much all there is.
Since even show tech transceiver doesn't seem to work on this old piece you can extract the info through SNMP ...
If you have an 8-port switch with ports 1-4 on VLAN 10, and 5-7 on VLAN 20, port 8 as trunk and default VLAN 1 ...
It's correct, VLAN 1 shouldn't be used
Untagged frames arriving on the trunk port 8
Tagged-as-VLAN-1 frames arriving on the access ports or the trunk port
What happens with these depends on your manufacturer, model, and potentially ...
As a configuration command, no vlan xy untagged n (or just no untagged n when you're in the vlan xy context) removes the VLAN xy as untagged from port n - so there's no untagged/native VLAN.
In Cisco speak that would be a trunk port without a native VLAN. In contrast to Cisco, on HPE switches you simply assign a VLAN as tagged or untagged to a port (with ...
Ethernet switches are transparent devices, so they do not alter the ethernet frames (except to add and remove 802.1Q tags for trunks). There is nothing in the ethernet frame header that supports what you ask, and a switch does not add anything, making it look like the source host is directly communicating with the destination host on a dedicated link.
Somehow, it asks for a vlan for the interface to be on access mode. I know for sure, that our other switches are configured just like I'm trying to do here now.
I believe this is probably just an issue with the version of code on your QFX (it is quite old).
Junos ELS configuration (Layer 2 configuration used on EX4300 and QFX5100) commits fine when you don'...
A port map is generally a listing of which patch-panel port is connected to which switch/router/firewall on which interface. For example, something like: "Patch-Panel A port 11 is connected to Switch 1 on port Gi1/0/34". While there are other types of port maps, I find that this is the most common use/form.
This question has been asked at least a dozen times.
We can only guess why the spec says what it says -- no one here wrote it.
Despite what the spec says, no one does that -- "ingress filtering" is always enabled on a VLAN aware switch: if vlan 20 isn't not assigned to the port, anything tagged 20 will be dropped.
As for untagged traffic, yes, it too (...