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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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Increase Ports in Cisco Packet Tracer [closed]

I want to connect 30 PCs to a single switch in cisco packet tracer but there is only 24 Fast Ethernet ports switches available. Can anyone guide me how can I increase the ports of a switch or a switch ...
Zain-Rehman's user avatar
0 votes
1 answer
510 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, ...
Penguin's user avatar
  • 27
1 vote
1 answer
254 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/...
R3ne's user avatar
  • 41
0 votes
2 answers
185 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 ...
Mhd Ghd's user avatar
1 vote
2 answers
185 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 ...
pgoetz's user avatar
  • 111
0 votes
1 answer
21 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 ...
AhmedWas's user avatar
  • 273
1 vote
4 answers
645 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 ...
Thesil's user avatar
  • 13
1 vote
3 answers
631 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 ...
S. M.'s user avatar
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0 votes
2 answers
534 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 ...
steve's user avatar
  • 1
4 votes
1 answer
192 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 ...
ECHO's user avatar
  • 89
0 votes
1 answer
340 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 ...
Ram Kumar's user avatar
1 vote
1 answer
194 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 ...
Somayyah Mohammed's user avatar
1 vote
1 answer
48 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: ...
Manas's user avatar
  • 113
1 vote
1 answer
834 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?
Vinícius Ferrão's user avatar
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0 answers
382 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 ...
logic_bomb_walter's user avatar
2 votes
1 answer
476 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 ...
Dequavis's user avatar
1 vote
1 answer
249 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'...
user3819641's user avatar
1 vote
2 answers
197 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 ...
Noob_Guy's user avatar
  • 491
0 votes
3 answers
325 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 ...
o8uijoipjasdfjiloasdfjl's user avatar
0 votes
1 answer
333 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 ...
Elias Bats's user avatar
0 votes
3 answers
76 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 (...
TSG's user avatar
  • 125
1 vote
1 answer
58 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? ...
244boy's user avatar
  • 1,777
0 votes
2 answers
764 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 ...
prudv's user avatar
  • 3
0 votes
2 answers
2k 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 ...
prudv's user avatar
  • 3
1 vote
2 answers
1k 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 ...
Daniel B's user avatar
  • 113
3 votes
1 answer
391 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 ...
AtomiX84's user avatar
  • 145
0 votes
0 answers
108 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 ...
Ramzah Rehman's user avatar
0 votes
3 answers
2k 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 ...
Zohaib Ali's user avatar
2 votes
1 answer
149 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.
sowmith reddy's user avatar
1 vote
1 answer
110 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(...
Brijesh Sundi's user avatar
0 votes
2 answers
207 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 ...
ronnie's user avatar
  • 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'...
Emanuel's user avatar
  • 41
0 votes
1 answer
151 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.
Jim Pap's user avatar
  • 419
1 vote
1 answer
8k 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 ...
Jim Pap's user avatar
  • 419
4 votes
1 answer
516 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 ...
Huckleberry Finn's user avatar
4 votes
3 answers
3k 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: ...
Nenq's user avatar
  • 45
4 votes
1 answer
2k 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 ...
Craken's user avatar
  • 681
2 votes
1 answer
63 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 ...
stdcerr's user avatar
  • 135
5 votes
2 answers
3k 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: ...
244boy's user avatar
  • 1,777
2 votes
2 answers
90 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 ...
fundagain's user avatar
  • 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 ...
user19215's user avatar
  • 313
0 votes
3 answers
206 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 ...
WakeDemons3's user avatar
4 votes
1 answer
828 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 ...
bdes31's user avatar
  • 1,085
1 vote
0 answers
268 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 ...
Andre Smit's user avatar
0 votes
1 answer
675 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?
244boy's user avatar
  • 1,777
2 votes
1 answer
963 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 ...
vim_usr's user avatar
  • 195
2 votes
1 answer
37 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(...
three-blocks's user avatar
1 vote
1 answer
72 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 ...
lustre's user avatar
  • 155
2 votes
2 answers
332 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 ...
Ninja Bug's user avatar
  • 603
1 vote
1 answer
4k 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, ...
Nawaf's user avatar
  • 13