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Questions tagged [switching]

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

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44 views

Cisco Nexus 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
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0answers
23 views

Dropped large packets with VMWare [closed]

We have a strange issue in our network. We saw it the first time when we wanted to restore SQL databases to a test DB. The restore failed, in the windows log we saw iSCSI errors, the mounted iSCSI ...
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1answer
40 views

Can different VLANs have same subnet? [duplicate]

When talking about VLANs I often see examples like this: VLAN 10 - 10.0.10.0/24 VLAN 20 - 10.0.20.0/24 Different subnets yet different VLANs. I understand this is a must if we want communication ...
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1answer
42 views

Setting all switchports as tagged for 200 x VLANs?

question: should I expect any performance hit from enabling 210x tagged VLANs on ALL 24x ports of a switch (or alternatively setting ALL 24x ports as trunk ports) background / equipment: We have a ...
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2answers
37 views

Is datagram switching only possible with routers?

So datagram switching is when packets from same original message travel different paths from source to destination. This cannot happen with switches because switches would just run STP thus ...
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3answers
65 views

Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...
1
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1answer
80 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(...
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2answers
81 views

How is Ethernet a packet-switched network?

Let's say for example there is an Ethernet switch, and there are four PCs connected to this switch. PC1 and PC2 are communicating with each other, and at the same time PC3 and PC4 are also ...
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1answer
30 views

I have a small managed switch I want to use as the default gateway for my subnet, but something isn't working

Not a networking guy by trade, but I know enough to get myself into some trouble. And I think I've managed it. I need to set up a DHCP server on a PC for a small subnet of 3 or 4 devices. I have ...
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3answers
67 views

Regarding Cisco's hierarchical network design

why routed ports usually implemented between the distribution layer and the core layer ? why not just extend the layer 2 domain to the core layer ? is the other design model more practical than this ...
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1answer
21 views

Broadcast Timer [duplicate]

This question is regarding in the process of L2 MAC Address learning. As we know, if a sender sends a packet to some receiver host which switch doesn't know, it will broadcast for learning. Assume an ...
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3answers
92 views

Do routers understand transport protocol?

We are taught about the difference between hubs, switches, and routers. A hub is a layer 1 device, it only knows layer 1 and doesn't care about layer 2 and above. Similarly, a switch is a layer 2 ...
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0answers
49 views

C2960 - Memory has insufficient capacity

Please, do you know if there is any way on how to release more processor memory from a C2960 switch without restarting it? I am receiving an insufficient memory alarm from this switch. I noticed that ...
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1answer
88 views

Will this network diagram cause broadcast storms?

I have three VLANs, and I want to communicate between them, but all packets are dropped. I made a trunk to allow all VLANs. Should I use STP to control broadcast storms?
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1answer
78 views

Help with VLANs on Meraki MX

I have a Meraki MX84 in Routed mode with a Default 10.10.0.0/24 subnet and then VLAN 10.10.3.0/24 ID 3, VLAN 10.10.4.0/24 ID 4, VLAN 10.10.5.0/24 ID 5, and 10.10.8.0/24 with ID 8. All ports on it are ...
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2answers
73 views

Is Spanning Tree Protocol Needed?

If there are two switches connected directly together with two links is spanning tree protocol needed? please see below snippet
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1answer
44 views

What's the LAG interface period be if the two switches have different periods set

Considering a LAG interface between two devices A and B, A is configured to have LACP fast transmission and B to be LACP slow what would be the resulting aggregate interface's period be?
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2answers
43 views

Switch Ethernet Port Groups

I am setting up a motion capture system (vicon vantage), and the cameras are PoE, and all plug into a switch (DGS‑1026MP, 26 Port Gigabit Max PoE Switch) to feed a PC. The instructions say to not ...
0
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1answer
131 views

What exactly is fragment free switching?

Most commonly refered to as a compromise between store-and-forward and cut-through switching, this method involves storing the first 64 bytes of the ethernet frame in a buffer and then forwarding it. ...
3
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3answers
161 views

How to add multiple ip address in destination ip in acl rule

Iam trying to block a certain host from sending any message to any host in the network is there is a way to do that or i have to deny host by host ?
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1answer
22 views

Which path will frames prefer in this setup? [closed]

So I recently installed a long rj45 cable to replace the powerline adapter I was using. I'm keeping the PLA in place as a failover but wanted to know if I will need to swap the connection by hand to ...
1
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1answer
55 views

How to do port mirroring in Juniper EX2200 switch

I am using Juniper EX2200 switch, one of the connected System generating lot of unwanted traffic ( varying from 10 Mb to 25 Mb upload traffic). I wanted to analyse those traffic using port mirroring ...
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0answers
30 views

Loop-prevention measures on BGP-signalled VPLS

I have a project to configure a BGP-signalled VPLS overlay for an MPLS network. I will multihome the VPLS to a switching fabric via 2 PEs for redundancy. I understand that VPLS split-horizon behavior ...
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2answers
79 views

Cisco 3750X Switch stack best practices

I have a stack of 5 Cisco 3750Xs. I am debating between taking all my servers and putting them on one of the 5 switches, or distributing them over the first few ports of all 5 switches? All of the ...
4
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1answer
127 views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...
0
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1answer
64 views

Netgear M4300: Is it possible to enable multiple destination ports for mirroring?

I have a Netgear m4300 12x12f. Using the web Console I'm able to use one global port for mirroring traffic from other ports. Is there a way to have different ports mirroring different traffic? I'm ...
1
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1answer
25 views

Sending Broadcasting Frames after sending Unicast Frames

Absolute newbie here guys, I was reading the compTIA Network+ guide by Mike Meyers, and a section reads: "The frame propagates down the wire into the central box. The switch sends unicast frames to ...
4
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1answer
480 views

Why would a switch ever send an ARP request for a MAC address when it can just wait for the first packet to be received from a device?

I've been reading 'Windows Networking Fundamentals' and in that book it says that a switch can learn what MAC address is associated with a particular port when the connected device makes its first ...
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1answer
204 views

Flooding vs Unknown Unicast Flooding

Can someone clarify what is the difference between Flooding and Unknown Unicast Flooding? Is it the same thing or it contains different meaning? I'm aware that Flooding happens when a switch ...
3
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1answer
582 views

Difference between Giant Frame and Jumbo Frame

Can someone enlighten me the difference between Giant Frame and Jumbo Frame? From what I hear, Giant frame is a frame with the size greater than 1518 Bytes excluding Preamble, Frame Delimiter and ...
0
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1answer
31 views

localhost vs local IP address: traffic flow [closed]

Let's say I have a server with IP address 192.168.0.1 that is running a network service (I don't think it is important what kind - let's say a webserver on port 80). If I am on the server itself and ...
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1answer
44 views

Mac Address Flapping and switches

Is mac address flapping the reason why switches don't exchange switching information just like routers exchange routing information?
4
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3answers
166 views

Inter-VLAN Routing Issue

As you can see in below diagram regarding the Inter-VLAN between Server (VLAN 107) with The site in (VLAN 104)actually, we can ping all the inter-VLAN on the site. but we cannot browse some of them ...
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0answers
18 views

DTP On Trunk Ports [duplicate]

When Statically Configuring a Port As Access, DTP Will Be Automatically Disabled. So Why Is It When Statically Configuring a Port As Trunk, DTP Will Still Be Enabled?
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0answers
48 views

Is it possible to use FDM and TDM at the same time?

I'm learning about FDM and TDM. And I got the idea that we can use frequency division and time division at the same time, i.e. using TDM for each frequency band. Is it possible? It seems certainly ...
4
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1answer
640 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 ...
0
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0answers
43 views

Spanning tree priority values on port-channel

Group Port-channel Protocol Ports ------------------------------------------------------------------------- 1 Po1(U) LACP Gi0/3(P),Gi0/9(P) 4 Po4(U) LACP ...
2
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2answers
379 views

Spanning tree Priority values

show spanning-tree interface gigabitethernet 0/2 Switch default Instance Role State Cost Prio type -------- ---- ----- ---- ---- ---- MST00 ...
0
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1answer
308 views

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems? Please, refer to the attached drawing. What are the equivalent Cisco Switches ...
1
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2answers
106 views

Confused between packet switching and circuit switching

I am a bit confused between packet switching and circuit switching usage in telephones. If there is a loss of packet in packet switching or the packets may arrive in different order why is it still ...
2
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1answer
143 views

Is FDM and TDM only used in circuit switched networks?

I get the idea that TDM and FDM can be used in circuit switched networks, but what about packet switch ones? Can FDM be used?
1
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1answer
39 views

Tracking the packet flow thru a LAN

We are using a private 10.0.0.0/8 network for the management and other local traffic (storage) in our LAN as shown in the symbolic layout here: 10.0.0.1 10.0.0.2 Gateway ...
4
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1answer
148 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
4
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2answers
343 views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
1
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1answer
70 views

Networking Questions (Routing and Switching)

I inherited a haphazard network that I'm in the process of cleaning up and modernizing. Here is a synopsis of the current issue: We have a MySQL DB hosted on a Windows 7 PC (solely used to host the ...
2
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1answer
60 views

Routing and Switching & network monitoring

hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
2
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1answer
42 views

Two channels between two switches

Is there a way to provide two physically diverse channels between two switches? I'm using two Cisco Catalysis 3560s, and I want to have two separate channels between them, with different access ...
3
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1answer
84 views

Cascading a switch interface to another switch

We have a service provider switch which has an interface that we use to connect to other users over. We have been advised by the SP that we can use this interface how we wish (i.e. feed it into a ...
2
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1answer
318 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
6
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2answers
870 views

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of ...