Questions tagged [switching]
For questions related to traffic switching and troubleshooting the traffic switching process.
424
questions
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9 views
OpenVPN over 4G with Raspberry Pi [closed]
I want to give internet capability to some DVRs (digital video recorders) using VPN and Raspberry Pi's. Can anyone outline the steps I would need to take? Please see the attached picture
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1answer
23 views
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....
0
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1answer
29 views
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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1answer
46 views
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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0answers
18 views
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 ...
2
votes
1answer
40 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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2answers
21 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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0answers
15 views
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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1answer
48 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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2answers
107 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?
2
votes
1answer
34 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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2answers
101 views
How to Change the Date on Cisco Catalyst 3750x Switch
We are using cisco catalyst 3750x 24 port switch series
How to Change the Exact Date(Singapore) on a Switch
ASW-G-L09-001#show running-config
Building configuration...
Current configuration : 11883 ...
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2answers
176 views
Fiber link loss on Cisco Catalyst 3750x series switch
I have cisco catalyst 3750x 24 port switch series switch, and the switch has C3KX-NM-10G module.
Problem :
I have connected fibre optic in SFP+ transceiver on G2/TE1 (Uplink). After 7 to 8 hours, the ...
4
votes
1answer
129 views
GNS3 switches vs Real switches performance
I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are:
Do emulated switches perform worst than actual switches?
Are emulated ...
0
votes
1answer
61 views
Is it possible to assign an IP to a tagged dual-mode port (Brocade)
I have a router (ubiquity USG) and a Brocade FCX648 Layer 3 switch. (I have a second one in a stack, but that's unrelated). The end goal is to be able to connect the switch to my router, provide IPs ...
2
votes
1answer
97 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 ...
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2answers
46 views
Need explanation on vlan tag/ip mismatch
What happens if I have a switch configured with an accessport on vlan 20 and someone uses a static ip in a different subnet. vlan 20 has the subnet 192.168.20.0/24 in the router. Suppose the ip used ...
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1answer
69 views
Virtual Chassis Setup in Juniper EX4200 Using Mixed Interface Types
We want to setup Virtual Chassis using 2 x Juniper EX4200 switches. In case of Virtual Chassis for EX4200 , we have to use 2 x VC cables (connected back to back) between 2 x Ex4200 switches along with ...
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3answers
240 views
What are the Major Differences between Juniper EX4200 vs Juniper EX4300?
Can someone please explain that what are the major differences between Juniper EX4200 and Juniper EX4300 switches? Both are standard Juniper Ethernet switches but is there any situation where EX4300 ...
1
vote
1answer
51 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'...
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3answers
97 views
What kinds of organizations use routing protocols (aside from ISPs)?
I don't understand why would an organization aside from an ISP even use routing protocols.
Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
0
votes
1answer
32 views
Is SONET a physical layer or a data link layer?
According to some sources, SONET is physical layer.
But some sources say that SONET can carry IP directly. Also, SONET defines its own frame -- it has a header and a payload. That must make SONET a ...
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2answers
54 views
Query regarding LACP System Priority
This is regarding LACP System Priority.
From my research I could find the following info pertaining to system priority.
LACP combines the System Priority value with the MAC address of the switch to ...
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2answers
99 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 ...
0
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1answer
54 views
Query regarding LACP timeout flag
Say we have two swicthes.
Switch A and Switch B.
Switch A sends LACPDU's with timeput flag set to 1 (fast).
Switch B sends LACPDU's with timeout flag set to 0 (slow).
By researching came to know that ...
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0answers
22 views
Queries regarding LACP
I have following queries regarding LACP.
Query 1
In LACP flag we have a field called as Aggregation, where 1
represents Aggregatable and 0 represents Individual.
In all the PCAP's I have seen so far ...
2
votes
2answers
115 views
Criteria to match for lacp status to come up
I did research and found that below are the minimum requirements for LACP to be Up.
One of the side should be active.
All the port speed should be same.
Duplex settings need to be same.
Also I have ...
2
votes
1answer
26 views
Wants to understand traffic flow of Catalyst layer3 Switch 3850 . what are sequence this switch will check to delivery packet to destination
i wants to know clear understanding about how Cisco layer3 switch checks in sequence order when traffic arrive to its L3 Interface . i want to know traffic flow in Cisco layer 3 switch ,because switch ...
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0answers
36 views
Issue with PIM-SSM Multicast Configuration ISR4431s
I have an issue with my PIM-SSM multicast configuration using ISR4431s.
I am wanting to forward broadcast data from an application from one VLAN in on the multicast source to another VLAN on a ...
0
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1answer
224 views
Sending a gratuitous ARP on an interval - Cisco
In response to my question Propagating Static MAC Addresses , I realize I can not avoid the unknown unicast problem. Essentially I have hosts that forward their traffic via an L2 frame to a ...
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3answers
68 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 ...
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1answer
68 views
Do switches allow parallel connections?
I am new to networking and not from Engineering domain. Sorry If I sound silly.
I came across an article on Network Switches and How they work. Diving deep into it, I found some interesting topics ...
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1answer
36 views
How a wifi AP handle packets
Computers are connected to a wifi AP. The wifi AP is connected to a L2 switch. A server is also conected to this switch.
When computers sends packets to the server, how the wifi AP manages the paquets?...
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2answers
127 views
Connecting switches together
I have L2 switches which will be daisy chained together (yes I know, daisy chaining isn't great, but anyway..) The L2 switches will then link to a L3 switch.
Both the L2 and L3 switches have x4 10GbE ...
0
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1answer
86 views
Why does the Layer 3 switch drop the ping packet?
I am trying to ping from PC2 (not PC1, there's typo in the picture) to the router's int g0/0, but the packet is dropped at the L3 switch which is along the path. I have tried setting a default static ...
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0answers
25 views
Tracing a host in a network [duplicate]
If I have a host connected to a say patch panel port number 39 which is connected to the switch. There's a cable manager in-between and there's no easy way to find out which switch port the cable is ...
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1answer
38 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? ...
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0answers
11 views
Why would OpenFlow require N^2 entries for MAC address learning in single table?
I'm reading this whitepaper and trying to wrap my head around why it would require O(N^2) entries for MAC address learning in OpenFlow with single table. See paragraph 2.2.1. In my naive mind, I think ...
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2answers
342 views
Vlan vs. Subnet Broadcast Domain
It is my understanding that Vlans separate broadcast domains, but I often see people say, "subnets define a broadcast domain" as well.
Is it correct to say, "Vlans define a L2 broadcast domain, and ...
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2answers
86 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 ...
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0answers
9 views
Dynamic Link Aggregation Speeds [duplicate]
This might be a stupid and easy to answer question, but I can't seem to get a straight answer from anywhere.
I have the following setup.
Modem --> Router --> 8 port switch --> server
I have ...
2
votes
1answer
223 views
What is the effect of having too many bridges / routers between 2 devices?
I am building a network, with each node connected to each other using fiber media converters. They are actually a bridge with 2 ports: one Ethernet and one optical (or one single-mode and one multi-...
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2answers
207 views
How would a bridge loop occur?
As I understand it, STP is used to prevent bridge (/switch) loops, which will typically occur in the case of redundant links on a switch.
But how can a loop occur and cause a broadcast storm?
If a ...
0
votes
1answer
41 views
Unknown device mac address listed in switch table on start out
After playing a little bit with a topology randomly created in packet tracer, I figured out that the switch (Switch0) stores a unknown device mac address on start out, wich I think that it belongs to ...
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1answer
76 views
Fastest way to switch between redundant wireless links
I have a system using 2 redundant point-to-point wireless links to access the internet, and I'm trying to find the fastest way to switch between them if one goes down.
We need to switch within 1 ...
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1answer
114 views
How do (LANCOM) Tag-Based vlan groups work and on which vlan does the device respond?
I just started a new job and part of it is to manage and maintain the ICT. As the previous network/system engineer left the company i'm on my own to figure out how everything works.
I have ...
2
votes
2answers
353 views
How do computers send switches packets, if switches don't have IP or MAC addresses?
I am new to networking, so please excuse me if I am saying stupid stuff.
From my understanding, PCs are sending packets to switches, which then decide which physical port to forward that packet to. ...
2
votes
2answers
50 views
I Cannot Ping Switch to Device, but can ping Device to Device
I'm currently troubleshooting a network i built and I'm having an issue with ping connectivity, i have set up DHCP and DNS and my end devices can get IP's from DHCP as well as i have intervlan ...
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1answer
672 views
Switch doesn't learn MAC of a connected device
I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
0
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2answers
123 views
How could the line rate of T1 be 1.544 Mbps?
T1 signal is the output of a 24-to-1 digital multiplexer whose inputs are 64 kbps each (plus one framing bit).
But a multiplexer is simply an electronic device that selects between several inputs and ...
