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Questions tagged [switching]

For questions related to traffic switching and troubleshooting the traffic switching process.

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Why is the bandwidth of the pre-established reserved link divided on multiple new connections?

I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit Switching Because it link has 4 circuits, for each link used by the end-to-end connection, the connection gets ...
tbhaxor's user avatar
  • 121
-1 votes
1 answer
64 views

Why MLS2 Doesn't Get ICMP Packet To Where It Should?

This is a Packet Tracer lab from Kieth Barker's website with minor modifications. It is intended to exhibit how can we get to the network 10.10.0.0/24 access to the Web Server 23.1.2.2/24 Using NAT. ...
Shadi's user avatar
  • 285
1 vote
1 answer
38 views

How can I diagnose the cause of a Dell EMC S5224F-ON discarding output packets?

I have a group of three Dell N5224SF-ON switches at one of my sites. One port in particular is being used to transfer several long-lived, high-volume streams onto a 1Gb/s port. This traffic should ...
David Mackintosh's user avatar
1 vote
2 answers
124 views

Why are DNS packets processed by process-switched?

I have a question. Equipment: Cisco 2821 CEF is enabled on all router ports: sh ip interface | i CEF Post encapsulation features: CEF Packet Capture IP CEF switching is enabled IP CEF ...
Глеб Щеголев's user avatar
0 votes
0 answers
67 views

End to end delay over N link including the (simplified) propagation delay

It is well know (see this question) and easily verifiable that end-to-end delay in case of trasmission of P packets of size L over N equal links (same transmission rate R) with zero propagation delay ...
frhack's user avatar
  • 101
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0 answers
23 views

Hybrid OpenFlow Ports on Allied Telesis Switches

I have an Allied Telesis AT-IE340-20GP switch. I want to make port (12 for example) a hybrid port. With hybrid I mean it should be able to forward packets when communicating with a non-OpenFlow port (...
Osama Abuhamdan's user avatar
1 vote
1 answer
73 views

Wrong subnet configuration works anyway in a shared bus, but doesn't work in switched lan. Why?

I was told that this configuration (which contains an error in DNS mask which is /23 instead of /24) works only because it's a SHARED bus. If it was a SWITCHED lan, the DNS responses from DNS to A ...
Allexj's user avatar
  • 111
2 votes
4 answers
467 views

Why non-blocking switch needed?

I know that a non-blocking switch is a switch that can manage the sum of the maximum theoretical speeds of all its ports. However, as the term suggests, "theoretical" maximum speed is just a ...
KSMoon's user avatar
  • 29
1 vote
2 answers
168 views

Understanding VLAN Tagging for Network Segmentation

I've been reading up on network segmentation and the use of VLANs to enhance security and network management. However, I'm still a bit unclear about the concept of VLAN tagging. Can someone please ...
Mahesh's user avatar
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0 answers
16 views

What is the practical use of bandwidth-delay product? [duplicate]

It's given that the bandwidth-delay product defines the number of bits that can fill the link; while the sender can send (1+(2 * Propagation Time / Transmission Time)) units before getting ...
SUNITA GUPTA's user avatar
1 vote
2 answers
204 views

Inter-VLAN using L3 switch

There are 3 VLANs 10, 20 and 30 on these switchs. Everything such as VTP, DTP are working fine. The problem is that inter-VLAN seems not to work correctly. IP routing is activated on the L3SW (even ...
Penguin's user avatar
  • 27
0 votes
0 answers
152 views

Q-in-Q on QFX5120

I'm building dot1Q tunneling between 2 Cisco routers and when I used only 1 QFX switch it all works fine. However when I try to use 2 QFX switches with basically the same configuration I cannot get ...
Seathorn's user avatar
1 vote
2 answers
335 views

What Does Exactly Happen When A Switch Is Connected To A Portfast Port?

I am trying to get a thorough understanding of what does happen when a switch is connected to a portfast port on another switch that is part of a stable STP network in case of: 1- the port has no ...
Shadi's user avatar
  • 285
2 votes
3 answers
442 views

Switches in chain topology for ~40 devices

I am currently looking at a network topology consisting of ~40 DUTs. In this network, there is no hierarchy (like access core and distribution), and all the switches are connected in chain topology. ...
user1397215's user avatar
0 votes
1 answer
67 views

how can a STP switch time out MAC addresses from the table in Listening state?

I am looking over some materials describing STP's port states (the original version from 802.1d) and they say that a port in Listening state can not modify the MAC address table (it doesn't learn new ...
Marcus's user avatar
  • 183
5 votes
2 answers
1k views

Two switches, double connection, no LACP: how does it work?

We have a network with an HP 1910-24 and a V1410-16 (unmanaged). The two are connected via two network cables, but there's no Link Aggregation configured on the 1910, and all the connections are ...
Maxxer's user avatar
  • 153
3 votes
2 answers
330 views

ethernet switching table is empty | vQFX | EVE-NG

I'm new to Juniper switches. I configured vlan10 and assigned two ports to the relevant vlan. root> show vlans Routing instance VLAN name Tag Interfaces default-switch vlan10 ...
Aaqil's user avatar
  • 33
1 vote
1 answer
64 views

In what situations is MPLS label erased from the top of the label stack in MPLS?

What are other processes that MPLS/IP routers can do with, or to MPLS label stack?
Vladimir Pejanovic's user avatar
1 vote
2 answers
79 views

How did ATM switches that were implemented in a core of IP network improve QoS and higher data rate?

How can ATM switch improve Quality of service and data rate just by incorporating them into the core of IP network? What was used in the sore of IP networks before ATM switches and what is used today ...
Vladimir Pejanovic's user avatar
2 votes
2 answers
154 views

Is there parallelism in packet-switching?

Let's say there are two hosts h1 and h2 separated by a switch w set up in this manner [h1]----link1----[w]----link2----[h2] If we are to send a file divided evenly into two packets from h1to h2 using ...
lambduh's user avatar
  • 23
0 votes
0 answers
77 views

How bad is doing a back-to-back connection to do VLAN mapping (vlan-stacking limitation)?

the object sounds like a newbie questions but there are good reason for it in the context of bridge-domains and vlan-stacking. Here below a picture to give a bit of context In short I realized that ...
GooGoo's user avatar
  • 11
1 vote
0 answers
125 views

Cisco 3850 not saving port config [closed]

I have a 3850 and whenever it reboots it loses its config. Power went out for a second today and it lost its port config. Weird thing is - it keeps the vlans. I have gone through this three times. I ...
UneRoue's user avatar
  • 111
0 votes
1 answer
722 views

Not shows Mac address in the Core Switch

Hi everyone i have a question, i have a device connected to the port in the Core switch, It's for LAN connected to Secomia device and the LAN port is configured and we checked in the firewall we see ...
israa imnati's user avatar
1 vote
1 answer
296 views

Vlan 20 & native vlan 20

If native VLAN 20 wants to communicate with VLAN 20 through a trunk link what happens? Will native VLAN be able to communicate with VLAN 20?
Pravallika Reddy's user avatar
1 vote
0 answers
135 views

Cisco switch police bandwidth for IPv4 and IPv6 traffic

I am trying to limit the bandwidth of several VLANs on Catalyst 3750X (c3750e-universalk9-mz.152-4.E10.bin) and Nexus 3064PQ (n3000-compact.9.3.9.bin) switches without success... It is necessary to ...
seb's user avatar
  • 11
1 vote
1 answer
190 views

Configuring shared uplink on l3 dell s4128f-on

I have a Dell switch s4128f-on which I'm using as L3 core switch. What I want to achieve is creating multiple vlans and being able to reach other networks through an uplink. What I've done so far is: ...
2202's user avatar
  • 13
1 vote
1 answer
392 views

how to limit or block broadcast traffic on ASR920 service instance EVC

I don't want to turn off all port, I want to block completly broadcast traffic, or the best to limit rate to 500 pps broadcast, all more to drop. Is there any way to do it on Cisco ASR920? I have ...
pad19's user avatar
  • 31
1 vote
0 answers
58 views

Optimal segment size for store-and-forward switching [closed]

Suppose we are transmitting a file of size X bits from A to B. They are connected to each other with a single switch using store-and-forward switching. Before transmission, A splits the file into ...
Nils's user avatar
  • 111
1 vote
3 answers
257 views

Do telephone calls work at Layer2?

We know that Wi-Fi works in both layer1 and layer2 and travel through air in layer1. My question is when we create mobile phone call during connection establishment phase sender Mac address and ...
S. M.'s user avatar
  • 398
1 vote
3 answers
624 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
  • 398
0 votes
2 answers
877 views

Switch won't forward a ping outside LAN despite having a default gateway

Maybe I'm just tired, but I can't get basic connectivity in my network. I've built this on Packet Tracer for the sake of troubleshooting and I've removed everything but the important elements. Here's ...
BloodLord's user avatar
0 votes
2 answers
121 views

how cisco switch handle the incoming frame

[![Hi am new to networking, am having packet tracer scenario here. I have 2 switches S1 and S2. I have not configured any VLAN on both the switches.so all the devices connected to both the switches ...
Phoenix's user avatar
0 votes
2 answers
70 views

How does a host (HOST_A) on LAN1 send a packet to a a network more than 1 hop away and how does a router (ROUTERX) handle that packet?

Suppose there is a host, HOST_A, on LAN1 and is sending a packet. The destination address of that packet is: 10.10.11.77 HOST_A will refer to it's routing table and see that that there is no entry for ...
appleebees-4-lyfe's user avatar
0 votes
1 answer
35 views

mount a industrial network [closed]

my objective is mount a fault tolerance industrial network, in an already very populated factory. the factory has many production lines and i want to treat them as a separate islands... so i want to ...
oso_togari's user avatar
0 votes
0 answers
19 views

Questions about how does the native VLAN work [duplicate]

I am studying about VLANs at the moment and I have a few questions regarding native VLANs and their purpose. I've read that they are used to carry untagged traffic, and that the native VLAN is ...
Mitrixsen's user avatar
  • 803
3 votes
1 answer
892 views

How do I check if a Cisco switch is connected to a SYSLOG server?

We use the Cisco C2960X switch. Query 1: What does console, monitor, buffer & exception logging mean? Query 2: Capture logging to 192.168.X.X which means if the switch sends logs to the SYSLOG ...
sjarasan's user avatar
  • 125
1 vote
1 answer
127 views

Trunk seems to be allowing all vlans

Got a catalyst 2690 on a small office net consisiting of 2 vlans, 10 and 20, 10 for the lan and corporate wifi and 20 fot guests wifi. All lan ports are config on access mode vlan 10 The access point ...
Alex's user avatar
  • 13
3 votes
1 answer
240 views

QinQ tunneling more than one VLAN as a provider + is it possible to send QinQ tunneling on the same port where L2 tagged works

I have done some QinQ's tunneling in my history but always there was only one customer, so situation was clear for me how to configure it. I mean access dot1q port to the customer and the rest are ...
fnsq's user avatar
  • 31
1 vote
1 answer
573 views

Can I use a 40G transceiver in a QSFP56 NIC to connect to a 10G transceiver/switch if the NIC supports 10G speeds?

We're purchasing new servers that have Mellanox ConnectX 6 network cards in them, which accept QSFP56 transceivers. The card says it supports 10/25/40/50/100/200G. However, our switching backbone is ...
dodexahedron's user avatar
0 votes
1 answer
146 views

Understand router Ip address and Mac address, Switch Mac address

Scenario:1 Suppose external Router R1 has interface a connected with interface b of the site Router R2. And Router R1 using IP address 80.0.0.0/8 for a. Router R2 has 4 subnets 80.0.0.0/10, 80.64.0....
S. M.'s user avatar
  • 398
0 votes
3 answers
1k views

Switch: port and NIC relation

I wonder if a switch has one NIC per port? for example, does a switch with 24 ports has 24 NIC? Many thanks in advance for your help.
ragnar's user avatar
  • 17
0 votes
1 answer
440 views

Total delay of virtual circuit switching? [closed]

We know that virtual circuit switching(VCS) has both features of circuit switching and datagram switching. It uses connection oriented path but may or may not dedicated that means resources may or may ...
S. M.'s user avatar
  • 398
1 vote
2 answers
233 views

Bridging two networks

Good days everyday. I am a newbie networking. I just have a question. The diagram above simplify my network setting. They are all in same location. Is there a way to connect from 192.168.0.XXX to 192....
Cell's user avatar
  • 13
0 votes
2 answers
132 views

Connect 1GE SFP MM to 10GE SFP MM

I have a situation in which the ISP can only accommodate a 1GE SFP and single mode fibre, but we have bought 10GE SFP. Is it possible to get the physical link up when connecting a 1GE SFP to a 10GE ...
Caine Kiewit's user avatar
-1 votes
2 answers
152 views

Multicast MAC using destination MACs

I am working on a routing algorithm which involves multicasts, my question is: Is there a possible way to convert a list of MAC addresses to a single multicast MAC address for configuration purposes? ...
Umair Shahid's user avatar
0 votes
1 answer
768 views

Creating a distributed ethernet using a single mode fiber ring

Can I create a distributed ethernet using just 1 x core of a single mode fiber ring ? Update (Sep 2022): The following is what we've implemented and works great. It's one of the options discussed in ...
hmedia1's user avatar
  • 103
0 votes
2 answers
521 views

Juniper EX Switch as router with transfer network for upstream network

So im new at juniper and networking. On my Juniper EX4550 switch i want to setup a transfer network to my upstream provider. So my upstream provider assigned a /30 subnet for the transfer network: ...
Giuliano Schindler's user avatar
3 votes
1 answer
808 views

IPv6 neighbour discovery blocked by MLD snooping switch

I recently noticed that my IPv6 multicast traffic was being broadcasted to all hosts connected to a switch, even those that had not subscribed to the traffic. To fix this, I enabled MLD snooping on ...
Malvineous's user avatar
5 votes
1 answer
5k views

Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
Engineer999's user avatar
3 votes
1 answer
594 views

HSRP on multilayer switch not working

I have this network topology in Packet Tracer, and i wanted to implement HSRP on both of the multilayer switches. So what i made here is the switch on the left, both the laptop and the server are on ...
1511's user avatar
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