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.
78
questions
0
votes
1
answer
151
views
Best Practices for Configuring Port Security on a Layer 2 Switch
How to configure port security on trunk and interfaces
I'm learning about port security and have a few questions. I have a layer 2 switch with interfaces f0/1-22 in access mode to access VLANs, ...
- 27
0
votes
0
answers
83
views
Use a single FortiSwitch in multiple, segmented networks
Is it possible to use a single switch in multiple, segmented and firewall protected subnets?
Looking at the above picture, I have this existing network WITHOUT the two inner firewalls. The switch is ...
- 1
1
vote
1
answer
42
views
Deleting description on Cisco 9300 switch
I have a port that has a description that is not needed. How do I go about just deleting that line. Sorry for the simple questions, I am very new to the networking world.
interface GigabitEthernet3/0/...
- 41
0
votes
2
answers
112
views
Failover with sticky MAC address on network switch
Introduction:
I am configuring a server to have two ethernet ports (one as primary, the other is redundant) connected to two different switches. In the switches, I enabled the sticky MAC address and ...
- 5
1
vote
2
answers
142
views
Difficulties retrieving attached device MAC addresses from switches/switchports
We have hundreds of mostly Cisco switches and I'm trying to track down all the MAC addresses (latest would be good enough) seen by all the switchports. Following the suggestion given here, I've been ...
- 111
0
votes
1
answer
19
views
DOT1X: A practical case for ForceUnauthorized state
I have been working as a Network Engineer for almost 5 years now. I have never encountered a scenario where I would need to configure a Cisco switch port as ForceUnauthorized (DOT1X).
According to the ...
- 251
1
vote
4
answers
348
views
Cisco Core Switches - Identifying unused ports
I've started at a new site, and the server room is an absolute state - I want to get in and start removing unused patch leads, so that I can start to see what is available & to tidy up.
There is ...
- 13
1
vote
3
answers
468
views
Why switch uses Mac address during implementation of spanning tree protocol (STP)?
We know that layer2 switch doesn't use Mac address ,uses only certain port number to accept the frame.
But I have been read on book as well as internet that uses Mac address to find spanning tree for ...
- 358
0
votes
2
answers
313
views
Managed Switch, Setting up VLAN Tagged, Untagged, allowed & tagged only etc
Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up.
The best graphic I could find to explain my setup:
My router DHCP is enabled so it will provide IP ...
- 1
4
votes
1
answer
167
views
How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch
In the following topology my main purpose is to:
1)PC11 ping Router(R)
2)PC11 ping PC13
ESW10:
In gig0/3 has the no switchport command and a given IP address.
In gig0/2 it has the switchport access ...
- 89
0
votes
1
answer
218
views
Switch Port channel down but firewall did not log the port down event
Can some one help me here if I am missing anything to check.
Issue:
Our Palo Firewall got a vwire configured with interfaces eth1/5 & eth1/6.
eth1/5 is directly connected to eth1/2 of cisco switch ...
1
vote
1
answer
130
views
ARP isn't showing all the interfaces/MAC bindings
I'm playing with Dot1x port authentication, the interface G2/0/2 is connected to a PC and is authenticated/authorized successfully:
SW1-2960#show authentication sessions int g2/0/2 det
...
1
vote
1
answer
43
views
IPFIX vlanId element in access switchports
According to IANA definition, IPFIX elementId 58 vlanId is:
Virtual LAN identifier associated with ingress interface. For dot1q
vlans, see 243 dot1qVlanId.
But according to RFC5102:
Description:
...
- 113
1
vote
1
answer
568
views
System default switchport shutdown on Arista EOS
Is there any equivalent to:
system default switchport shutdown
As available on Cisco's NX-OS to Arista EOS running with at least version 4.25.1F?
- 504
0
votes
0
answers
287
views
Using GNS3 to Sniffing Packets on Siemens RuggedCom RS900
I am using GNS3 to simulate an environment. I have 4 docker containers which all host Python programs. Three of the devices communicate with each other via the programs (Program 1, Program 2, Program ...
2
votes
1
answer
346
views
In RSTP, where all switches generate their own BPDUs, are they limited to forwarding them only on designated ports? (like in classic STP)
I recently learnt a rule in STP: only Designated ports forward BPDUs.
However, I'm not sure about this in RSTP since ALL switches generate their own BPDUs every few seconds. So, in a certain LAN ...
- 21
1
vote
1
answer
193
views
VLAN not working in ComNet switch [closed]
I'm trying to configure VLANs with 3 switches ComNet (2- CNGE2FE8MSPOE + 1- CWGE26FX2TX24MSPOE) and it's not working as I expect. It's the first time that I work with VLAN and I don't know If I didn'...
- 13
1
vote
2
answers
189
views
Do X.25/Frame Relay/ATM/MPLS have their own switches?
In the context of networking when we say "switch" we always think of Ethernet switch.
But do we have X.25 switch, Frame Relay switch, ATM switch, and MPLS switch?
If yes, how are they ...
- 471
0
votes
3
answers
260
views
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 ...
0
votes
1
answer
237
views
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 ...
- 157
0
votes
3
answers
68
views
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 (...
- 125
1
vote
1
answer
51
views
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? ...
- 1,747
0
votes
2
answers
628
views
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 ...
- 3
0
votes
2
answers
1k
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 ...
- 3
1
vote
2
answers
776
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 ...
- 113
3
votes
1
answer
352
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 ...
- 145
0
votes
0
answers
98
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 ...
0
votes
3
answers
1k
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 ...
2
votes
1
answer
75
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.
1
vote
1
answer
103
views
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(...
0
votes
2
answers
191
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 ...
- 1
4
votes
0
answers
54
views
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'...
- 41
0
votes
1
answer
143
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.
- 409
1
vote
1
answer
7k
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 ...
- 409
4
votes
1
answer
481
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 ...
- 213
4
votes
3
answers
2k
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:
...
- 45
4
votes
1
answer
1k
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 ...
- 681
2
votes
1
answer
58
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 ...
- 135
5
votes
2
answers
2k
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: ...
- 1,747
2
votes
2
answers
86
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 ...
- 169
3
votes
2
answers
3k
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 ...
- 313
0
votes
3
answers
195
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 ...
- 101
4
votes
1
answer
794
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 ...
- 1,085
1
vote
0
answers
243
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 ...
- 11
0
votes
1
answer
642
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?
- 1,747
2
votes
1
answer
927
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 ...
- 195
2
votes
1
answer
36
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(...
- 823
1
vote
1
answer
67
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 ...
- 155
2
votes
2
answers
289
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 ...
- 583
0
votes
1
answer
3k
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, ...
- 3