Questions tagged [switching]

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

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1answer
153 views

VLAN configuration help

I am lost on this, and I could use a bit of help. I have one PC that I want to isolate on my network on its own VLAN. Here is a rundown of my equipment: Netgear GS752TP Switch Cisco RV120w Router ...
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1answer
75 views

Handling high number of concurrent GSM device connections

How do telcos manage high concurrent GSM dial ins or dial outs? We are deploying thousands of remote, GSM enabled utility meters and have to manage too many GSM modems that the meters will dial in to. ...
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3answers
760 views

Procurve 2810-24g VLAN

I have set up a VLAN on my Procurve switch, with ports 12 and 13. The Internet comes in on port 2. My issue is that I can't give the VLAN an Internet connection and have the rest of the switch have ...
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2answers
2k views

Finding the optimum root bridge for a spanning tree

The spanning tree protocol uses the bridge ID and the MAC address of the switch to elect the root bridge. After the election process, a spanning tree is created, preventing switching loops by ...
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1answer
75 views

Bridge traffic forwarding in vlans

on a trunk, switch A having, say vlan 10 allowed and the other switch B does not. Switch B doesn't even know about that vlan. How does switch A behave in forwarding broadcasts in vlan 10? Will frames ...
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1answer
461 views

Dynamic ARP Inspection + IP Source Guard (without DHCP Snooping)

Consider the following scenario I have 2 switches, A and B connected via Po1 (LACP). IP DHCP Snooping turned on for both Switch-A and Switch-B. Dynamic ARP Inspection trust is configured on (Ppo1) on ...
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1answer
260 views

Broadcasting in L2 Switch

Hey guys, This is a Noob question. When a broadcast frame is received on a switch from a specific port, will it be automatically destined to all the ports in a switch ? ---------- (or) ---------- ...
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1answer
325 views

How does a switch handle 2 VLAN's on same port such as voice + access vlan

I'm trying to understand how a switch handles two vlan's on the same port, in the case of a voice vlan + access vlan. If you connect an ip phone to a switch and then a laptop to the switch at the ...
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7answers
9k views

Cant ping & access HP switch on network connected on trunking mode

I have been facing this problem for a very long time. Here is a diagram of the switch situation: The problem is that I have been trying to access the switch on the RIGHT(A3100) through the network ...
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4answers
4k views

One VLAN on two switches

I'm trying to understand the specifics of trunking a VLAN on two switches. Say I have two switches, both hosting half of VLAN 3. Switch 1: Ports 0-5 on VLAN 3, Port 6 is Trunk Switch 2: Ports 0-5 ...
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3answers
101 views

Traffic Classification

How does the switch or router differentiate between voice and data traffic? What are the parameters used in the different layers to classify this traffic?
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2answers
80 views

If I configure a default route for a switch, will it override the routing of the existing traffic?

In this instance it's a Extreme managed switch, but I guess this would apply on others too. Basically, I noticed we couldn't ping the switch, and eventually found this was down to the fact the switch ...
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0answers
348 views

Hp Procurve Action ignored in download mode

From an tftp server I'm trying to import the config to startup-config using copy tftp startup-config 10.0.0.10 5006zl.cnf The switch asks for confirmation y/n and when pressing y it just aborts ...
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2answers
82 views

Suppose we have a computer Network formed using a HUB but every connection is Full-Duplex. Would we STILL have the possibility of collisions?

I know that when hubs were used there was the possibility of collisions whenever two devices would transmit data at the same time. However on that time I believe that communication was done in Half-...
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0answers
275 views

How does a Switch Fabric Module work internally?

I am interested how does a switch fabric module work internally. What interfaces does it use to physically connect the I/O modules on switches? Where are the CAM / MAC tables of the switch? Are ...
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4answers
12k views

Why is the CAM table in a switch called CAM table and not MAC table even though it holds MAC addresses?

I know the CAM table in a switch holds MAC addresses and the ports that are associated with the respective MAC addresses. There are no such thing as CAM addresses from my knowledge, so why is it ...
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3answers
4k views

Connecting two switches with an access mode port

I manage a switch, and I saw that on one interface there were 19 different MAC addresses, all of them on the same VLAN, so I guessed that there was a switch connected to that interface. Since all MAC ...
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1answer
70 views

Why in STP is the switch that is the “center” of the network is called the “Root Bridge,” not “Root Switch”?

I am interested in the terminology of the term "root bridge." Why was this word chosen instead of the word switch, which would have been more intuitive?
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2answers
1k views

Can a switch that does NOT support VLAN capability be considered a managed switch if it has other features?

So the question is in the title. If a switch does not support Virtual Local Area Network capabilities can it still be considered a managed switch? What other features should it have to be considered ...
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2answers
2k views

Packet switching and Message switching

In message switching, the switches wait for the entire message to arrive (store) and then forward it to other switches. Does packet switching also use store and forward technique ? I know that in ...
2
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2answers
99 views

How can I find out if a path across an internet uses MPLS?

Is there a way that I can find out (using a terminal cmd/util), if across an internet path that a datagram may travel, if there are routers that utilize MPLS?
1
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1answer
325 views

Packet forwarding in Circuit switching

Does circuit switching make sure that all packets follow the same route?I understand that there will be a dedicated path between two end systems before data transfer and all packets are received in ...
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1answer
142 views

How do routers pass packets back down to switches?

I just had a very fundamental question about the transition between the router and the switch: I want to know about what happens when a router receives a packet, how does it go about passing it down ...
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3answers
2k views

What is the proper switch configuration for the switch that is connected directly to ISP source?

The Question: What is the proper configuration for the L3 switch to be allowed to assign public IPs for the firewalls? I guess All I need is that the switch L3 act as a layer 2 switch...Right? ...
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1answer
4k views

What is the difference between ARP and BUM Traffic?

Suppose PC1 with IP address 1.1.1.1 and MAC address A.A.A.A wants to send a frame to PC2 with IP address 2.2.2.2 and MAC address B.B.B.B, plus there is a switch in the middle. PC1 doesn't know where ...
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3answers
6k views

Default static route per vlan

I would like to know if it is possible to configure inter-vlan routing on a level 3 switch with a default route per vlan. Actualy, I have one switch with 3 VLAN (VLAN1, VLAN2, VLAN3) and a router ...
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2answers
11k views

GUI Configuration - HP Switch 5900

I have a simple question - I am a novice to networking and trying to understand if there is a GUI way to configure the switch (default UI / SNMP, etc.). I do not have any advanced needs but to simply ...
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1answer
738 views

Network design questions

I've been handed a project, and I'm familiar but not experienced enough to make a solid decision on this. I'm actually on the firewall side of things. We've lost our lead engineer and I'm wondering if ...
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2answers
1k views

How do broadcast communications work between hosts with different Subnet Masks?

Let's say I have three different hosts connected by a Layer 2 Switch: A) IP 1.0.0.1, Subnet 255.255.255.0, B) IP 1.0.0.2, Subnet 255.255.0.0, C) IP 1.0.1.1, Subnet 255.255.255.0, Who would a ...
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2answers
22k views

How IP helper address works?

How IP helper address works and what is the difference between dhcp and IP helper-address .please explain in brief.
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1answer
281 views

VRRP Election ? Why Skew required

I`m having a query regarding VVRP,If there are multiple backups then as per the election Skew time is useful.But assume there is a tie in priority then as per my research i am seeing which is having ...
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2answers
103 views

What happend when you set a trunk against an Access

I'm wondering what would happen in my network in the following configuration: on switch1 -> interface1 in mode access, vlan4 on switch2 -> interfaceA in mode trunk, vlan4 and vlan8 switch1 is ...
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1answer
635 views

VTP updates through router!

Can vtp client revisions be updated from another server switch that connect it only through a router? the two switches are in the same domain name
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3answers
30k views

Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?
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5answers
5k views

Best practice for connecting router to switch? (re: VLANs and multiple ports)

When using multiple VLANs, what is the best practice for connecting a router to a switch? For example, I can use one single port (and one cable) between the switch and router and set it up as a VLAN ...
1
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1answer
68 views

spanning tree, how can I change the path?

I have 2 Switches I made either channel between them , but every switch is connected with other links through other switches that can reach the destination and the spanning tree makes the channel not ...
0
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1answer
105 views

DHCP behind catalyst 3750 POE-48 [closed]

I'm a database developer that inherited and managing an environment, we recently got disconnected from our parent company. Anyway we got couple of ESX servers, physical servers and we're having ...
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4answers
6k views

Layer 3 Switch Routing vs Router on a Stick

CORE: Dell N4032 (6.3.0.18) Access: Dell N2048 (6.3.1.13) We are in the process of setting up a serviced office that will serve multiple businesses. Each "customer" will naturally be on their own ...
2
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2answers
6k views

Designing a redundant switching infrastructure

Ultimately I've been tasked with the installation of a serviced office with upwards of 1000 staff, potentially being spread across 50+ VLANs. The hardware bought was out of my hands, but it's fairly ...
3
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1answer
150 views

Switches - help me to understand please

If a PC wants to send to another PC through a switch and does not know its MAC address, that means all PCs on network will receive it and see it!! If we change the NIC for a PC in the network, how ...
2
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2answers
2k views

Same MAC address on different VLANs

I am facing a situation where on the core network I have around 15k MAC addresses, and on the edge switches (Access Layer), I am finding switches with 27k MAC addresses. Access switches are configured ...
2
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1answer
692 views

VLAN vs Subnet in switch

For VLAN communication we need a layer 3 device. For internetwork communication, we also need a layer 3 device. Then why did concept of VLAN emerge?
2
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2answers
225 views

ARP reply and use

I have a very rudimentary doubt. I am sure missing something but cant recollect what. Suppose we have 2 hosts connected on 2 interfaces of a switch. if host 1 pings host 2 , it will first send an ARP ...
2
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1answer
1k views

CIsco 4500 output drops

I have a access switch with a 10gb upstream interface and a 1gb downstream interface, i can see from the show interfaces [int] that traffic is being dropped on the upstream downstream direction. ...
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2answers
139 views

STP / Why one end is in BLK state?

So I've had a question that I haven't had a real answer to, I'm not even sure if there is an answer other than "That's just how the algorithm does it." So why does STP only block one end of a line on ...
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2answers
3k views

Multicast ARP Switch

So a few questions that I've struggled to find firm answers on. 1: Does multicast use arp? So does it ask for a corresponding IP address? I think the answer is no, as it translates the IP to a MAC ...
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3answers
5k views

Does a switch understand packets? If yes, what is the frame terminology for?

I was a little confused between packet and frame. The confusion was based on, if a switch is a layer 2 device, how does it reads a packet from a layer 3 device, and where is the 'frame' thing which is ...
12
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1answer
22k views

RIB vs FIB differences?

Can someone explain the differences between a RIB and FIB a little further? I didn't see any similar questions on the site so I thought this would be a good addition. The RIB routes and the FIB ...
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2answers
302 views

Forwarding communication between two ports on switch

I have an industrial network with ring topology, consisting of a number of dumb switches and one manageable switch (Siemens OSM 62) acting like a supervisor. But now I would like to add new switch to ...
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2answers
116 views

Mostly wireless campus vs. VoIP

We will be replacing our campus network in the next year or two, and we are leaning towards increasing the use of wireless since most people primarily work from laptops & mobile devices. Plus, we ...

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