a device that bridges network segments, operating at the OSI link layer level.

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11 views

Node not Obtaining IP Address [on hold]

Infrastructure: Modem-Router has 4 Ethernet Ports. Port 4 is reserved for IPTV (VLAN). Switch A is attached to Modem-Router on Port 4 to host IPTV. 2 IPTVs are connected to Switch A. Switch B is ...
0
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0answers
17 views

Cisco sg300 Home Lab Issues [on hold]

I have a lab with a VMware ESXi server, a client PC, and a Cisco SG300 with multiple VLANs configured in L3 mode. The PC is in VLAN 239 (the lab subnet), and the server is in VLAN 241 (the "server" ...
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1answer
14 views

nagios snmp switch config

I installed Nagios 4.1.1 on Centos7. Already added my Windows 7 PC, and two Windows servers. Now I wan't to add some switches. My problem is that I have not "check_snmp" installed. Already added the ...
7
votes
2answers
8k views

HP ProCurve 2920 switch stack topology for TWO switches? Ring vs. Chain vs. trunk?

I have a customer whose two HP ProCurve 2910al PoE switches have failed. This was backing a VoIP deployment for a small call center. They are interested in replacement PoE switches, but there's a ...
0
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1answer
24 views

Network Router “inside” and “outside” on the same switch and the same network

Is it necessary for a router, that inside and outside are on a different (sub-)net? As an example: We have the following setup in the field: Network: 10.10.1.0/28 R1: Router with R1.outside access ...
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0answers
8 views

Wifi router with two WAN ports [on hold]

Is it possible to replace switch with wifi router with two WAN ports? Current situation Internet provider => Switch => PC => Wifi Router (WAN Port) Wanted result Internet ...
2
votes
0answers
22 views

What is the purpose of a “static LACP” trunk group on HP switches?

I'm in the process of educating myself regarding configuring aggregated links on HP ProCurve switches. Looking at non-vendor-specific documentation regarding link aggregation, the defining ...
10
votes
5answers
17k views

What is the disadvantage to cascading multiple switches?

I have to wire a new office for ethernet and the contractors want to charge atrocious amounts for each line running to each room in the office. It will be much cheaper for me to run a single line to ...
0
votes
2answers
857 views

Cant Connect/Ping to Management Console on Cisco SG200-50 after Connecting networking

I have two of these switches. When I have nothing else plugged in and a cable from port 1 to a laptop on the same subnet I can connect fine, however after plugging any additional networking in I ...
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2answers
31 views

Why do some VLAN Wireshark captures include data after the IPv4 payload?

Data Some Cloudshark captures show a "Trailer" for the vLAN and some do not. Captures With extra 4 bytes. Without extra 4 bytes. Question Why do some and not all VLAN Wireshark captures ...
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4answers
3k views

Default gateway config in FlexFabric 5700

We've taken delivery of a brand new set of shiny FlexFabric 5700 10GbE switches. I've read through the config and setup guides provided by HP and they're great, except that they outright lie about ...
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0answers
15 views

What is the difference between enable password and line password on Dell PowerConnect?

What is the difference between enable password and line password on Dell PowerConnect? I think I need more info about authentication of Dell switches.
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0answers
16 views

Fortigate software switch, lost packets with connected switch

I have a Fortigate 60D device, with software switch configured ("lan" - vlan 1), plus other vlan interfaces (2, 3) on top of the hardware switch. I have a Dell managed switch connected to the FG-60D, ...
0
votes
1answer
24 views

Two untagged VLANs on one port (ProCurve)

Goodmorning I'm setting up a new network. My problem is that i have a management VLAN 99 and an IT VLAN 89. Now i want to connect my laptop to one port and access both VLANs. Because when i'm at my ...
2
votes
2answers
48 views

Linux bonding (balance-tlb), KVM guests and L2 switches = unicast flooding?

I have a unicast flooding problem on my network, that started when I moved some software to virtualized guests. It seems very similar to what reported here: Switch flooding when bonding interfaces in ...
0
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1answer
31 views

ARP spoofing on switch across subnets

Consider a switch without any VLAN's defined with 2 subnets configured. Is it possible to ARP spoof from one subnet to another? According to Evans reply in What are the implications of having two ...
2
votes
0answers
13 views

Data throughput/latency and poe performance in TPLINK TL-SG2424P 24 ports POE Managed Switch

I recently bought a TPLINK TL-SG2424P 24 ports POE Managed Switch. At the moment I'm going to use it with only a handful of access points, no more than 4 or 5, at least until the end of the year ...
2
votes
4answers
6k views

new Catalyst 2950 switch, no console or telnet CLI access

I am connecting a brand-new Catalyst 2950 switch to my LAN. It is on with green lights, and frames successfully go in and out the ports. The switch is on the same LAN has my host PC, and pings are ...
2
votes
1answer
25 views

LAG on one managed switch

This may be a dumb question, but is there any benefit of using LAG on only one managed switch with 2 VLAN's? By default my switch, Netgear GS724T, assigns 8 LAG's to the default VLAN. I am using VLAN1 ...
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votes
1answer
24 views

how should I divide a network into several smaller vlans on a extreme switch?

I get a C-network from my ISP, and there's a static route in ISP side pointing to one ipaddress(192.168.0.2) in my C-network so that this C-net can be reached from outside world. I use a Extreme X460 ...
0
votes
2answers
33 views

cisco 3850 in separate wiring closets - VSS?

I have two new 3850 24 port gig switches. I am putting one in the front wiring closet of our warehouse, the other in the rear. IS there a way to have these be a layer 2 / layer 3 Virtual Switch using ...
0
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0answers
28 views

Cisco 6500 - spike of DHCP_SNOOPING-4-QUEUE_FULL causing clients to lose connectivity

Today we had an incident that started with people complaining they couldn't connect to our wifi after coming back from lunch. Long story short, clients were no longer able to get IP addresses from ...
9
votes
4answers
4k views

How long do managed gigabit ethernet switches take to boot up?

One critical drawback that I have found in researching managed-switches, and one that I have some past experience with is that anything with "lots" of firmware is going to have lots of issues ...
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0answers
6 views

Querying counters and interface name from cisco router is getting wrong results

using cisco switches, I am trying to connect the output from ifHCInOctets to the names of the interfaces via ifName and comparing it to show interfaces counter. I use the last number behind the ...
0
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1answer
27 views

LACP - Load Balancing Network 2Gbit Ubuntu

I have configured my server as bonding interface to achieve 2Gbit network speed but it seems ubuntu can not go over than 1gbit and the outgoing traffic from server is not balanced over 2 interfaces. ...
1
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1answer
36 views

Debugging dropped UDP messages on Linux

Here's my setup: I have 1 host that has a 1 Gbit Ethernet connection and 2 hosts with 100 mbit connections (connected to the 1Gbit host through different switches). In a test, I send 1000 1kb ...
1
vote
1answer
42 views

Procurve Inter VLAN Routing

I have a VLAN routing issue on our network. We have two ProCurve 5406zl's being used as our core switches, each vlan on these switches has an IP address and VRRP is configured on each vlan for ...
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votes
3answers
62 views

Connectivity between switches using SFP+

My office infrastructure is currently configured with HP Procurve switches. They are interconnected with 10Gbps fibre. All the SFP+ Ports are in use on all the switches. I am looking at buying a new ...
0
votes
3answers
54 views

Why another PC on lan can ping me even when I use /30 subnet?

Here is the set up: PC A : IP address : 192.168.1.2 Netmask : 255.255.255.252 Gateway: 192.168.1.1 PC B : IP address : 192.168.1.220 Netmask : 255.255.255.0 Gateway: 192.168.1.1 PC B is able to ...
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0answers
57 views

2 VLANs between four switches

I am having a problem that I do not quite understand with my network setup. I have four switches on the network: Switch A is a managed network switch which is connected to the PC router -- it is set ...
0
votes
1answer
18 views

Cannot access D-Link DES 3200-10 after resetting account

I've forgot my password and after googling I've found that in recovery mode I can reset my account. Connected to Switch using console port (VT100+ Keyboard compatible) and pressed Shift+6. I accessed ...
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0answers
25 views

More Management VLANS for a switch

I created a management interface in vlan 99 to telnet the switch (2900 series). I also wanted to configure another management interface for the same switch from the computer belongs to the different ...
4
votes
2answers
19k views

How compatible are sfp's really?

How compatible are sfp modules between devices. For example, am I likely to be able to plug something like this into a cisco, hp, or other switch with mini gbic ports? http://www.cdwg.com/shop/...
1
vote
0answers
37 views

VLANs with mixed MTUs trunked over a LAG

I'm contemplating enabling Jumbo frames for a specific network/VLAN (a dedicated storage network). Ports are spread across two switches, linked together using a LAG, which is configured to carry all ...
1
vote
5answers
13k views

Difference between trunk and tagged port

I am reading some wikipedia articles and RFC 5517, studying VLANs, and I don't recognize the difference between a trunk port and a tagged port. From what the material I am reading says, a tagged ...
2
votes
3answers
1k views

Layer 2 segmentation and network diameter

I am studying for my CCNA. The book makes a statement that I do not completely understand: "Layer 2 segmentation at the distribution layer practically eliminates network diameter as an issue." I'm ...
2
votes
2answers
6k views

Are you able to save the running-config on Nexus Switches

I have been trolling Cisco sites and have not been able to find an answer to this questions. Are you able to perform a write mem or likewise to save these configs on Nexus 5000 switches?
2
votes
1answer
401 views

Catalyst to Nexus Migration - Can 4948s be used for access switches

We currently have a switching topology in which two 7600 make up the core and there are N many access layer 4948s at the top of every few racks. They are trunked to both 7600s. I would like to ...
0
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0answers
8 views

Ceph Cluster Switch Specifications [duplicate]

What's more important when building a 10GbE Ceph cluster - switches that have larger buffers or switches that have less latency?
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votes
1answer
45 views

Set Internet Access for VLAN + Default Gateway + DHCP Client

I have a question that make my mind so bussy. I would appreciate if anyone guide me about this. So let me explain: Firstly consider We have bellow devices: Devices: 2 L2 Managable Swiches 1 ...
0
votes
1answer
26 views

frequent delay of 5-10 sec in sending commands from putty redhat. Why?

When we type a command from putty, it suddenly hangs for a period of 5-10 sec or more, but the commands are sent to terminal later. So seems to be a latency which occurs frequently. But, I might be ...
0
votes
0answers
24 views

Can't reach centos server after “Multicast listener report” IPV6

I ran into a problem that occurs only on a few servers. Every 5-6 minutes I lose connection to the server, and it get backs after a few minutes. In most cases it's a VM that is not reachable while ...
0
votes
0answers
20 views

Can I reset and access a Netgear GSM7532S without a serial cable?

I've recently been given a GSM7532S switch, however, I don't have any equipment with a serial port or have a serial cable. This device appears to have a web interface available but attempting to ...
0
votes
3answers
879 views

Is there a Cisco IOS command for finding out the serial number of a switch / router?

I am doing an inventory of all of our switches and I was wondering if there's a Cisco IOS command that will return the serial number for a switch and router? Thanks in advance!
0
votes
1answer
30 views

Networking related

I created two Vlans in a switch: Vlan 2 and 4. I want to access these two vlans in my computer without help of L3 switches. For this purpose I created port 24 as a trunk and directly connected to it ...
0
votes
1answer
58 views

Extreme Switch QinQ

Trying to configure QinQ solution between two extreme switches facing an issue: | Error: 8: Port cannot belong to VLAN and a VMAN at the same time.| This port is not configured in any VLAN or VMAN ...
0
votes
1answer
39 views

Intervlan routing--DHCP offer from server on default VLAN not making it back to newly created vlan via layer 3 switch

Default VLAN: 10.36.0.0/24 New VLAN : 10.36.8.0/24 DHCP server : 10.36.0.17 I can see the DHCP offer packets making it back to my VLAN ip address namely 10.36.8.31 (from dhcp server message log) ...
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votes
1answer
55 views

Point of Sale Terminal Crashing the Network

We look after a series of restaurants which is a collection of point of sale terminals and a typically a single workstation per site. We have one site that is causing a fair amount of head ache and ...
1
vote
1answer
628 views

DHCP Requests cannot get through Switch

First a little about the network setup: We are a smaller department of a larger school. We have 7 offices with TP-Link managed switches as well as 20 APs and 24 classrooms. The switches, APs and ...
3
votes
2answers
4k views

Cisco 2811 router ignored input errors

I've got a Cisco 2811 (AdvIPServices 12.4(25e)) that is showing input errors on both its interfaces, all the errors are of the ignored type. The counter for ignore errors is not increasing ...