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Switches / Hubs

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A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switch Catalyst 500 questions

Dear Team, we have several Catalyst 500 acting as Access switches for users, printers, Finger prints (FP) and Access points.

Here is a problem: 2 FingerPrints -----------------------90 m---------------------------- A small switch (LinkSys) ----------20 m----------- Catalyst 500

In Catalyst 500, there are few modes for port operations; such as Switch, Router, Access Point, PC, Printer,... When I configure a port (which connected to a small switch) in Switch mode, I cannot ping those 2 FPs, but when I set that port to Access Point or Router mode, I can ping them.

Besides, it only works for few hours before disconnected (request time out). I have to reboot FPs to ping them again.

Can you please explain?

2 Comments

How to block unmanaged switches from network. I have already apply BBDU Guard on interface but where unmanaged switches attached port will not block. and in show spanning-tree interface detail command no BpDU received. So please help is required for block unmaanged switches fron network. Other than port security please

7 Comments

Hello
I have 2 switch that connect each other with 4 layer 2 etherchannel links(4*1G)
my load balance method is src-dst port.
Zabbix show me that traffic goes among beetwen link Approximately equal.
Can i say we have maximum 4G bandwidth in my network?

Switches / Hubs

5 Comments

LVL 4

Question by

Cobra25

2017-07-14

Vmware NIC Teaming

Hey Guys,

I have ESXi 5.5 and the server has 2 nics. The 1st nic is going to a switch, and that switch lately seems to be having issues with dropping packets, i have a lot of leg work to do to completely remove (Which is the plan soon), now i have a second switch on the same vlan and i can run a cable to that switch for us to work off of. Should i set this is up as NIC teaming or can i actually use this new NIC as part of the same network without any downtime - essentially move everything to this nic without making network changes ?

11 Comments

I have cisco 3650-48fq-s with 4 TenGigabitEthernet sfp ports trying to connect to at&t 1gig ase circuit but link not coming up.

Here is the config on the port:
Interface TenGigabitEthernet 1/1/4
Switchport trunk allowed vlan 110
Switchport mode trunk
Speed nonegotiate

Then I tried on cisco 2960-XR with 1gig sfp port on it and it worked.

I have 4500 series cisco L3 switch at another location with TenGig sfp port on it with same above config and works there.

16 Comments

hey ,

the port that has the sfp SR does not come up , i have tried to do a shutdown no shodwon and still does not come , when i do shutdown command the port does not go for orange color .

i am confused !

BR

2 Comments

Question by

Arun SD

2017-07-10

Network Slow

I just got a general question :

If there is a company with 2 Managed switches(Dlink) and all computers and servers are connected to the switches. And has a dlink router.
If a user complains, accessing files to the server is slow from my computer .
How do i troubleshoot? from where do i start? is there any specific tools/softwares to troubleshoot.
I AM just new in networking career. so sorry guys if its a simple question.

6 Comments

Hello experts,

I have an old 3COM 4500 switch (3CR17561 91) and I need to set up QOS to give one machine in my network preference over the internet, including browsing and downloads.

I have access to the web admin page and I don't know how to configure the ACL to this purpose. I need the IP 192.168.10.182 to have full precedence over other connections to the internet. He is connected to port 20.

Here is a print from the configuration page:

I read a lot of info here about people with this same problem and using command line, but if you could help me with this web interface I would appreciate.

Regards.

0 Comments

Hi All,

Could you all help with this config I'd like to implement OSPF ?& if this is the correct configuration to implement?

MAN(config-if)# ip address 10.10.12.13 255.255.255.0
MAN(config-if)# no shut

BEL(config-if)# ip address 10.10.12.12 255.255.255.0
BEL(config-if)# no shut

2. The routing OSPF between routers:
MAN(config)# router OSPF 1
MAN(config-router)# network 10.10.14.0 0.0.0.255 a 0
MAN(config-router)# network 10.10.12.0 0.0.0.255 a 0
MAN(config-router)# network 10.200.3.0 0.0.0.255 a 0

BEL(config)# router OSPF 1
BEL(config-router)# network 10.10.120 0.0.0.255 a 0
BEL(config-router)# network 10.10.11.0 0.0.0.255 a 0
BEL(config-router)# network 10.202.3.0 0.0.0.255 a 0

LON(config)# router OSPF 1
LON(config-router)# network 10.10.0.0 0.0.0.255 a 0
LON(config-router)# network 10.10.0.0 0.0.0.255 a 0
LON(config-router)# network 10.0.3.0 0.0.0.255 a 0

BATH(config)# router OSPF 1
BATH(config-router)# network 10.0.14.0 0.0.0.255 a 0
BATH(config-router)# network 10.0.10.0 0.0.0.255 a 0
BATH(config-router)# network 10.0.3.0 0.0.0.255 a 0
OSPF-NEW.PNG

3 Comments

A few years back I had to fly to a remote data center and was sent several cisco switches that were to be "stacked" I recall unboxing everything and plugging it all in via instructions from my home office. I booted with a console cable and configured the initial IP address. Then home office pretty much took over and although I was able to observe a lot if it did not sink in. I do recall the stacks only had 1 IP address each and since it was a remote data center we had set up switch redundancy. I remember plugging in cables that had to be crossed to the switch below and when it was all done everything was set with dual power supply and I could have sworn it was configured so if a switch failed another one would take over. I had another job after that where a cisco stack was already installed. I recall 5 switches and when we had to shut down power the Master had to do go down last and come up first. At least I think that was the order, it was written on the wall next to the devices. I am asking all this because I have a job interview that will including installing and initializing a lot if Cisco devices including stacks. It sounds like it will be very similar to what I did years ago, installing the hardware and getting it set so the engineers in the home office could take over. I just do not remember the purposes for a stack as apposed to multiple switches. I know you will save IPs by configuring a switch as a stack, but what the other main reasons? I know the remote install …

3 Comments

Hello Everyone,

I have a single Cisco Catalyst cat4500e-LANBASEK9-M) switch running iOS Version 15.1(2)SG6. We have two VLANs in place. VLAN10 (data)=172.16.1.0/24 and VLAN20 (SAN)=192.168.58.0/24. I am currently able to ping all resources on VLAN20 from the switch. However, I'm unable to ping resources on VLAN20 from resources on VLAN10 (data)=172.16.1.0/24. The switch is not connected to any other switches. this switch is connected to a Cisco ASA5506 on GE0/1 (172.16.1.1/24). Could someone please help me figure out what I am missing?

Thanks.
sh-run.txt
sh-vlan.txt
sh-ver.txt

2 Comments

Got a HP1920, I can stop people getting to the switch via telnet and FTP, but when I have signed onto the switch via a SSH session, I can telnet and FTP off it. How do I stop this ?

Switches / Hubs

2 Comments

I have a Hp2520 switch with SFP conecction. We had a power failure and the SFP port did not come back online. Any suggestion where to start. I diid replace the SFP module on both ends. i used J4859C-A0.

Switches / Hubs

0 Comments

I have a HP 2520G switch that connects to a HP E5412zl by fiber connection. We had a power failure in the area of the HP2522 switch. The fiber connect did not come back after power was restored. I replaced the SFP on the HP2522 but still no activity. Any other areas I can check?

Switches / Hubs

2 Comments

Hello,
I need to configure a shaping under a 10G interface on the Nexus 5500. I have only L2 licenses on it. I must configure a shaping of 2 GB.

Thanks in advance

Luca

Switches / Hubs

1 Comment

Optimize your web performance

LVL 1

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Question by

nii dan

2017-06-29

ios commands

What are the basic commands in configuring a switch using boson
netsim

1 Comment

someone has forgotten password because it has been sitting around awhile, we held reset, fyi won t let us log in? I assume there is no password or user set up. if not how do we remote in? I have been try to use a serial and use putty but no luck? And what command do we use if we can ever get in to program a username ?

Switches / Hubs

1 Comment

Hi, My concern is that Can i use SRX series Firewall as a Router

2 Comments

I think that TFTP Client service is enabled by default.

How can disable to TFTP Client service?

Let me know command.

Thanks & Regards

1 Comment

This is using a Netgear Prosaft M4100-50G L2 switch. There are 2 VLANs on this switch, namely, vlan 10 besides 1. Ports 12, 21-35, 38-40, and 44 are on vlan 10. The rest is vlan 1. This switch is located in our remote office. There are 2 uplinks connected to this switch from our hq. The first uplink, connected to port 43, is basically uplink for vlan 1; second uplink, connected to port 24, is means for vlan 10. This logical segregation works perfectly, any port either belong to vlan 1 or 10, can grab the IP from respective dhcp servers located in hq.

2 week ago, thing changed. Users using vlan 1 ports found that they no more able to grab the IP. Their port looks like is entirely "isolated". After much checking, we were having a "workaround", that is, get in an additional 8-port switch, move the first uplink, and connect it to this 8-port switch. After that, get an additional short network cable, with one end connect to 8-port switch, and the other end to any vlan 1 port of this netgear switch. The vlan 1 operations are back to normal.

Just wondering why? How to get the netgear switch to work alone without this workaround?
Please see the netgear config as attached.

Thanks in advance.
EE---Netgear-M4100-50G-Prosaft-Switc.txt

3 Comments

Dear Experts,

I recently ran into some issues with my new Switching equipment. Since cost is always a big factor in home lab toying I changed from HP ProCurve to the Ubiquiti EdgeSwitch. More specific I change my 2920-24G with a 2SFP+ and a 2 10GBe extension to a Ubiquiti ES-48 and a Ubiquiti ES-16-XG.

Since I have now more than enough SFP+ Ports for my home lab toying around I wanted to create LACP between the Node (ESX Host) and the Ubiquiti ES-16-XG to connect the node with maximum performance to the Synology DS3615xs which I also upgraded with a dual Port SFP+ Card.

Here a little schema

Now the Synology DS3615xs was very easy to setup and as you can see in the attached picture (SynologyLACP.png) seams to be working as a dynamic lacp member on the ES-16-XG.

With the vSphere 6.5 Distributed Switch it seams like a whole other story... I can't seam to find the ressources or manuals where they describe how to do it with the DS or how to get it working.

Can someone point me in the right direction?

Thanks in advance

Cheers,
Yves
SynologyLACP.PNG

0 Comments

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