All Questions
Tagged with switch networking
48
questions
0
votes
0
answers
10
views
Directing single subnet traffic via multiple VLANs [closed]
I have a setup where I would like to distribute devices connected to a L3 switch in multiple VLANs but I have a DHCP server offering a single subnet to the switch.
I'm attaching a network diagram ...
- 101
0
votes
0
answers
17
views
Resetting brocade vdx 6720 password to default without boot password
I want to reset a Brocade VDX 6720-24 switch that i got from ebay to default settings. It has a boot password. Extreme networks can not help with the recovery string because it is past end of life. Is ...
2
votes
3
answers
88
views
Core Switches Redundancy Problem
I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
- 25
-1
votes
1
answer
27
views
VLSM Error on Cisco Distribution Switch [duplicate]
I have created 3 VLANS which should not overlap but somehow are giving me overlapping problems. Any reasons why? Is the switch buggy?
VLAN 10 10.1.1.0/28
255.255.255.240 Usable:10.1.1.0 to 10.1.1.15
...
0
votes
0
answers
81
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 ...
- 101
1
vote
2
answers
594
views
Brocade 7450 - set MTU to 9000
I have brocade icx 7450.
I already enabled jumbo frames to increase MTU packets on switch.
But unfortunately I am not able to change MTU size of port which I want. When typing after choosing interface ...
- 13
0
votes
1
answer
249
views
input discards on Arista 7124SX-F
im seeing input discards on one of our uplink on Arista SW
if i run sh platform fm4000 interface ethernet 22 counters verbose command it is showing smp0DropPkts which is equal to the input discards.
...
- 103
0
votes
1
answer
148
views
Noob: i design a network for 156 computers/4 printers, need help in few things
Sorry if this stupid questions: I just learn networking like a week.
Lets say company xyz have 39 computers and 1 printer in each floor, there are 4 floors, total amount of computers is 156computers ...
1
vote
1
answer
208
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:
...
- 13
1
vote
0
answers
83
views
Port mirroring traffic on Hyper-V not showing Layer 3-7 traffic [closed]
We've been experiencing some issues with port mirroring that is used by a Network Intrusion detection system. Our company uses AlienVault as a SIEM and uses a Hyper-V sensor which is used to forward ...
- 11
1
vote
1
answer
4k
views
How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI? [duplicate]
How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI?
- 11
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 ...
- 153
0
votes
0
answers
22
views
What is preamble in ethernet frame and why is it used? [duplicate]
I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean?
Also I've seen another definition that preamble gives NIC time to realize a frame is ...
- 107
1
vote
1
answer
71
views
How Switch knows if the packet reached it's destination?
In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
- 107
1
vote
1
answer
82
views
How do switches handle network data if the destination computer is powered off in half-way?
Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
- 107
1
vote
1
answer
240
views
Is it possible to configure Cisco ASR901 as a layer 2 VLAN switch?
I have been fiddling with a Cisco ASR901 for a while now, but I can't wrap my head around configuring it as a layer 2 VLAN switch. Is it not possible to configure one of its Gigabit Ethernet ports as ...
- 13
0
votes
2
answers
40
views
Why Ping Reply Succcess from different subnet IPs
In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
0
votes
1
answer
40
views
What is the difference between these two different network security devices?
I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means.
SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
- 103
1
vote
1
answer
548
views
How to block telnet access for one particular network from all networks except one using Extended ACL
Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
- 21
1
vote
2
answers
1k
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?
- 491
1
vote
2
answers
2k
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 ...
- 125
0
votes
1
answer
152
views
Linux networking + mix of auto-negotiation of yes/no [closed]
we have 10 servers with Advertised auto-negotiation: yes
as
the machines with driver driver: i40e
driver: i40e
version: 2.3.2-k
firmware-version: 10.51.5
expansion-rom-version:
bus-info: 0000:12:00.0
...
2
votes
1
answer
453
views
Trex not receiving any packets
This is my setup to benchmark my server Diagram
Trex version v2.88
Trex server MAC
ens2f0: f8:f2:1e:5c:bf:78
ens2f1: f8:f2:1e:5c:bf:79
DUT server MAC
eth0: fa:16:3e:1c:be:82
eth1: fa:16:3e:d5:37:b1
...
- 4,379
4
votes
1
answer
199
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 ...
- 43
1
vote
4
answers
648
views
setting up a VLAN and joining 2 buildings through underground cabling
I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd.
So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
- 11
1
vote
1
answer
6k
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?
- 13
0
votes
1
answer
68
views
What is the difference in packet structure for tag VLAN and port VLAN
I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
- 1
0
votes
1
answer
4k
views
Connecting a 10 Gig server to a 1 Gig switch
Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow:
4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port)
However, we are trying to see if ...
- 1
6
votes
2
answers
3k
views
Can a single subnet work across several switches?
New to networking and studying hard but limited access to a kit to try things at the moment...
My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
0
votes
1
answer
56
views
Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?
I can query a interface detail:
admin@Juniper-EX# run show interfaces ge-0/0/1 detail
Physical interface: ge-0/0/1, Enabled, Physical link is Down
Interface index: 131, SNMP ifIndex: 504, ...
- 1,777
1
vote
1
answer
263
views
Any expected issues with stack of 8 Cisco 3750X switches?
I am planning the network for our new offices this time utilising Cisco 3750X's (WS-C3750X-48P-S). The required port count has gone up and up so have had to procure some extra switches to bring the ...
- 151
0
votes
1
answer
4k
views
POE negotiation between IEEE PD and the POE Switch?
I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
- 81
0
votes
2
answers
722
views
Can't get to the Internet from VLAN on switch
I'm trying to setup a network lab to learn more about networking.
Equipment:
2 procurve switches.
1 Sonicwall firewall TZ300
The final outline:
traffic from Vlan 10 on switch 1(port1) goes to ...
3
votes
2
answers
337
views
Is it possible to limit a IP's traffic in gateway Juniper switch?
In my gateway Juniper Switch:
...
irb {
unit 0 {
family inet;
}
unit 2 {
family inet {
address 10.10.10.254/24;
}
}
unit 9 {
family ...
- 1,138
0
votes
2
answers
193
views
How can a IP under a VLAN communicate other VLAN's IP?
I have a network topology as below:
I want to use the Server0 to manage(communicate) to 10.10.10.1-3.
you know the 10.10.10.1-3 are vlan100's SVI.
there have vlan 100 and vlan 501.
IP programme:
...
- 1,777
0
votes
0
answers
54
views
Why write a static route, it can communicative to each other in my scene?
I have a network topology like below:
In Switch0, Switch1 and Switch2, I added the a SVI. However, it is not possible to reach from one SVI the other ones.
Now, if I write the following static route ...
- 1,777
1
vote
1
answer
355
views
Connecting networks from different states [closed]
Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
- 13
1
vote
0
answers
219
views
Colocation network setup - 2 switches with each 1 uplink - redundant configuration question [closed]
I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself.
My topology ...
- 11
0
votes
2
answers
83
views
Stack network power transfer
i have 2 cisco catalyst 3750G's,
and a stack cable a have a question about the stack
does is transfer power so do i only need 1 power cable or 2
and is there a way to reset the password without a ...
2
votes
1
answer
19k
views
missing Packet tracer physical Tab
hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
- 21
1
vote
1
answer
73
views
ISP Failover On A Converged Network
We have our fiber provider as our primary ISP. We have Comcast as our secondary ISP and our VoIP provider. We can setup the failover between the two ISPs. We also have 19 VoIP phones that are on a ...
- 11
1
vote
1
answer
55
views
Half duplex setting switch forwarding frame collides with host forwarding frame
So my question is regarding half duplex switches connected to hosts. Consider a case where a switch is connected to a host by a single link. In an event where a switch decides to forward a frame to ...
- 113
1
vote
0
answers
56
views
Switch problems: No loop, no damaged port, so what? [closed]
This is a medium size company. We have a 2960G switch as a core switch, which is connected to three 2960 series Cisco switches by fibers and clients are connected to these three ones. All of the three ...
- 11
2
votes
1
answer
132
views
What are the differences between a basic configuration and a full configuration of a network device?
When someone is talking about a basic/base configuration of a network device, does this mean the startup configuration file? And when a full configuration is referenced how is it different from a ...
- 209
0
votes
1
answer
211
views
Assigning IP Address ranges - Protocol, Best Practices [closed]
I am looking for standard procedures when assigning a range for static ip addresses. Which are the most commonly used approaches and why. I am trying to look on the internet and this forum, however ...
- 3
5
votes
2
answers
736
views
What is the best to simulate an RJ45 cable failure without changing switch configuration or removing the cable?
I am looking at an automation element for a training environment.
We would like to be able to fail a cable without doing a shutdown on the interface or having an engineer physically remove the cable ...
- 151
1
vote
2
answers
2k
views
Unable to ping internet from switch
Router internet interface Fastethernet0/0 192.168.0.17 (ip nat outside)
internal interface 192.168.1.1 (ip nat inside)
able to ping 8.8.8.8 from router
Interface IP-Address OK?...
- 131
1
vote
0
answers
131
views
Frequent Internet Disconnection [closed]
Hello everyone!
I am relatively new to this forum, and wanted to get some useful feedbacks and resolution from "network-PROs" on my problem..
I have a network with a main router connected to the ...
- 11