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Questions tagged [switching]

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

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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 ...
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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 ...
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3 answers
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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 ...
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3 answers
60 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 ...
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Cisco EFP point-to-point -- How to see MAC addresses

I see on cisco ME3600x and I read in documentation as below, that "the MAC learning is not supported in point–to–point bridge domains" Table 1 MAC Learning Actions Scenario Action A bridge ...
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2 answers
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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 ...
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2 answers
47 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 ...
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2 answers
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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 ...
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1 answer
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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 ...
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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3 votes
1 answer
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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 ...
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1 answer
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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 ...
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1 answer
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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....
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Physical interface on Cisco Router not forwarding to BDI interface

I think I've outlined the basic interface setup accurately in the diagram. What I'm trying to do is to run a server on my laptop connected to R2 that is IP'd in the same net as an out of band network (...
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3 answers
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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.
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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 ...
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1 vote
2 answers
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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....
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2 answers
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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 ...
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-1 votes
2 answers
70 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? ...
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1 answer
55 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 ? This is an existing installation, I can't change the following constants: I have approx 100 locations (nodes) in ...
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2 answers
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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: ...
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3 votes
1 answer
138 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 ...
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5 votes
1 answer
1k 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 ...
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3 votes
1 answer
142 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 ...
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2 votes
0 answers
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Storm control problem with Juniper switch configuration (EX2300)

I am new with Juniper and generally new with switch configuration. Probably screwed up a lot but anyways, I will share my configuration right after I say what I want. I am getting Internet on ...
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1 vote
2 answers
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Is this description of data transmission over L3 switch correct?

So I'm trying to describe how data is transmitted over a layer 3 switch (within same Vlan and between Vlan) but I'm not sure if I have understood it correctly. Can anybody verify if this description ...
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1 vote
1 answer
79 views

find out physically connected cisco switches

I am working with hardware guys and trying to monitor switches.Those guys deployed switches with some connectors,to implement such a logic in which whenever switch A goes down switch B goes down as ...
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2 answers
141 views

Message switching vs packet switching with respect to congestion traffic

Packet switching uses store and forward technique to forward packet. And message switching is also uses store and forward technique to forward message. But in packet switching data transfer faces ...
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-1 votes
2 answers
239 views

Routing between SVI and routed port on router

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? F.E int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 ...
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1 vote
2 answers
198 views

Can anyone please explain L3 SVI configuration ,What is SVI and Where do we use it?

I am learning about switching and came across SVI in vlans ,I Googled and watched couple videos and got really confusing Firsly where do we use Svi? and why do we use it,How to configure svi and what ...
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2 votes
1 answer
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Avoiding FPCs rebooting during RE switchover on Juniper EX8200 Switche

We have Juniper EX8208 chassis based switch running in a production environment. The switch has 2 REs running in active and standby role with RE0 being the primary routing engine. The device is ...
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2 answers
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L3 switching and broadcast

I don’t know is this the right way to ask this question. But anyway my question is when we configure L3 switchport as a routed port and it’s connected to a another L3 switch. Does that routed port ...
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1 vote
1 answer
247 views

Need help with HPE tagging and hybrid-mode port

At my office I have two switches. SW-1 (HP-V1910-48G) is the switch my desktops are connected to, and SW-2 (HPE-1920 JG927A) is where my server rack with my dhcp and default gateway is connected. ...
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-1 votes
2 answers
343 views

Can't ping the second network interface connected to a switch [closed]

I have the following topology: Default Gateway1 <--> SWITCH1 <--> [ NIC2 - (Windows 10 PC) - NIC1 ] <--> SWITCH2 <--> Default Gateway2 --> Internet NIC1 is DHCP configured, ...
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1 vote
1 answer
48 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 ...
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0 votes
1 answer
67 views

I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
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the performance improvement of Cisco's CEF, compared to the other (inferior) switching techniques

On the road of getting more insight on Cisco's CEF implementation .. can someone quantify, what is the raw performance improvement (gain) of CEF compared to process-switching, fast-switching? .. maybe ...
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1 vote
1 answer
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Access layer switches uplink mode

We have core, distribution and access layer switches. the switches in access layer connect several workstations on VLAN 20 only. we have DHCP server on VLAN 1 but is on another switch with all servers....
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1 vote
1 answer
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Unable to ping switch

Why can't i ping S1 from PC-B, but it's possible to ping PC-A? S1#show running-config Building configuration... Current configuration : 1638 bytes ! version 16.3.2 no service timestamps log datetime ...
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1 vote
1 answer
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DHCP Help 3560-CX + Aruba AP515

The problem VLAN 100 is not assigning IP address to the SSID Guest from the AP, but Aruba is Tagging the SSID to be VLAN 100. How do I get the Switch to assign the DHCP? On the switch, it seems to ...
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How do switches learn the neighbour MAC address? [duplicate]

According to the CCNA Official Guide a switch learns the new MAC address by checking the source MAC address of a new frame. Here is the quote: Switches build the address table by listening to ...
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2 votes
1 answer
214 views

What might be the potential impact on increasing or decreasing MTU size of packet in network

i am looking eagerly to know the potential impact on network while and after changing maximum transmissions (MTU ) from 1500 default value to any other value .
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0 votes
2 answers
26 views

Does circuit switching know any information about the networks topology? [duplicate]

I've been stuck with this question for a while. I'm aware of the fact that in circuit switching all the packets use the same path, but does circuit switching need to know the network structure in ...
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ISDN, DSL, Circuit Switching and Package Switching [duplicate]

I need a bit of help to clarify the above-mentioned terms. From my reading, I can see that both ISDN and DSL are used over telephone copper lines. However, ISDN is associated with circuit switching ...
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1 vote
1 answer
84 views

Mac Instability in STP after topology change!

So I'm learning about STP and I recently been taught that when the topology is changed due to direct or indirect Link failure a Mac Instability could occur, So I was wondering, If the blocked port is ...
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1 vote
2 answers
387 views

Do DSLAM and OLT function like a switch?

Let's say for example we have the following hypothetical topology: In each network, can each user communicate with each other? For example, can User 1 ping User 2?
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2 votes
1 answer
160 views

Port only in trunk mode vs encapsulating the frame

A network with 2 switches, each switch has 2 vlan, one called vlan 10 and another vlan 20. A port-channel with 2 uplinks (trunk). Why in a layer 2 scenario I don't need to configure the trunks with ...
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