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

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4
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0answers
97 views

Configure Juniper M320 as Ethernet/STM transparent converter

There is Juniper M320. We need to move ALL the traffic from one port to another. Everything that comes to one port goes to another and vice versa. No snooping or any other processing is required. One ...
2
votes
0answers
125 views

Display port security state of an HP 3COM 5120 switch port

I'm using an HP-A5120-24G-SI switch and I'm asking how to obtain the current state of the port-security module for a certain port. I'm able to view the current settings using display port-security ...
2
votes
0answers
306 views

Cisco SG300 switch does not send RADIUS messages to server for 802.1x

I want to eventually configure the SG300 to authenticate wired clients with 802.1x and Microsoft NPS (RADIUS). I am currently testing this setup using a single port (Port 7) on my SG300, a test ...
2
votes
0answers
93 views

How to fix an aborted firmware upgrade on Cisco SLM2048

There is a Cisco SLM2048 switch and the last firmware upgrade aborted, now the switch doesn't work anymore. I can't access the switch. The only evidence is a blinking system LED. As the switch doesn't ...
2
votes
0answers
294 views

Drop Events on a Dell Powerswitch 2724

I have a rather simple network setup here at an office. We utilize a Sonicwall TZ205N, plugged into a Business-Class Cable modem for internet, and plugged into three Dell PowerConnect 2724 gigabit ...
2
votes
0answers
355 views

Configuring LACP across a IBM B50G switch stack

Is it possible to configure LACP (Link aggregation control protocol) that spans across two IBM B50G stacked switches. Below is an illustration of what I am trying to accomplish. I have currently ...
2
votes
0answers
987 views

Issues connecting to HP ProCurve switches

We are having a very strange issue trying to connect to our infrastructure switches via SSH. When you first try connecting to them, the switches will prompt for the password - and then just sit there ...
2
votes
0answers
211 views

Inexplicable STP Behaviour

I have a problem with a couple of Dell PowerConnect 6248 switches (latest firmware) connected to a pair of external (3rd party) switches providing Internet connectivity via HSRP. I'll post more ...
2
votes
0answers
678 views

Configure vlan on Netgear switch via SNMP

I am trying to configure vlans on a netgear GS752TSX from the Linux command line with netsnmp. I have created vlan 99 on the web interface now want to control the pvid settings, egress and tagging. I ...
2
votes
0answers
262 views

Basic QoS policy for Dell 6248 switches

My cisco edge router tags all incoming packets as IP precedence 0, 3, and 5 depending on their priority. How can I add a matching QoS configuration on the switch so that packets are prioritized ...
2
votes
0answers
310 views

Q-BRIDGE-MIB representation of ports on Dell PowerConnect 6248

I have a Dell PowerEdge 6248 with a 2x10Gb uplink module. I'm trying to make sense of the representation of the ports from the following snmp output: Q-BRIDGE-MIB::dot1qVlanStaticUntaggedPorts.4081 = ...
2
votes
0answers
479 views

Port mirroring on Cisco switches

I have a Cisco Catalyst 3750X switch, and I have configured port mirroring on it. Traffic from 12 of the 1G ports will be mirrored to both 10G ports, and I have connected both 10G ports to a server ...
1
vote
0answers
28 views

Why would command line parameters not be recognized?

I have a small console application written in C# for .NET 4.0. The application takes 2 parameters, either "-run" or "-clr". So it would be called via command line like this MyConsoleApp.exe -run ...
1
vote
0answers
131 views

Cisco SG300 SNTP servers always down

I'm trying to setup the SNTP of a new Cisco SG300-48 Switch in L3 mode. So far I have enabled the Main Clock Source (SNTP Servers) option (Administration -> Time Settings), set my time zone and ...
1
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0answers
53 views

Dell PowerConnect Link Aggregation Failover Failed

We are a small office with two Dell PowerConnect 5548 switches that, together, cover all of our servers and hosts. I had them connected using ports 47 and 48, which I placed in a LAG. Port 47 was ...
1
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0answers
99 views

Why don't TP-Link 24x-switches propagate clients when cascaded in two?

I'm behind two TP-Link switches those are cascaded behind a TP-Link router, which is in turn behind a consumer router that works as in modem only mode. Clients connected to the first switch work ...
1
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0answers
95 views

HP 5120 vlan not working

So I have this odd issue with our HP 5120 switches. The VLANs will not pass traffic unless a interface with a IP is assigned to the VLAN. Problem is there is a limit of 8 VLAN interfaces that are ...
1
vote
0answers
49 views

Measuring latency with switch and identifying flow path

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
1
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0answers
236 views

DRAYTEK - VLANs with VLAN tagging switches / router

Our company uses Draytek routers (various models, slowly upgrading to 2860n at each site). We have recently purchased a new site, and want to split the network up into separate VLANs, so as to ...
1
vote
0answers
164 views

How to replace a fan on a 3com SuperStack 4500 unit (and where to find a fan)?

I have a couple 3com SuperStack 4500 switches with failed fans. I am not having luck locating information on HOW to actually replace the fans, or where to find a replacement/what kind. I know what ...
1
vote
0answers
169 views

Windows mounted network drives slow after upgrading switch

On our small business network our old 10/100 consumer grade switch gave up the ghost, and we replaced it with a proper business-grade gigabyte switch. After wiring it in our Linux and Mac users ...
1
vote
0answers
105 views

Routing between L2 isolated ports

I am to deploy some managed switches for FTTB/FTTH and preparing configuration to introduce isolation between customers (by disabling L2 forwarding between client ports or using private VLANs). ...
1
vote
0answers
192 views

why do I lose ping to a machine when using port mirroring / monitoring (sniffing)?

I am using port mirroring / monitoring in my 3COM layer 3 switches to look at network traffic (using wireshark). Sometimes, I have found that I loose connectivity with the remote monitor machine ...
1
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0answers
59 views

Juniper 802.3ad Link between Switch and Router 3x link issue

We have a live 20Gbps link between our switch and router and we are trying to add another 10Gbps link to the LAG, we've changed all the settings on both end to add the third interface to the LAG yet ...
1
vote
0answers
136 views

Cisco Auto Smartports on catalyst 2960-s

I have Cisco Catalyst 2960-s, I want to configure user defined macros on it. I searched a lot in Cisco documentation but its not for beginners :( How to create a user defined macro that runs when a ...
1
vote
0answers
76 views

IGMP 2.0 snooping switch timeout

Suppose a host computer has joined a multicast group 239.0.0.50 via IGMP 2.0. As per the IGMP 2.0 spec, when the host computer receives either a general query on 224.0.0.1 or a group wide query on ...
1
vote
0answers
255 views

Dell PowerConnect SNMP stack member monitoring

I am looking to monitor a stack of Dell PowerConnect 6248p switches via SNMP. There is a stack of 3 switches that I want to monitor. Due to the stack being 1 logical unit it only has 1 IP, so when ...
1
vote
0answers
367 views

Cisco vlan entry missing in vlan.dat, but appears in running-config

One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a dhcp ip address. On the Cisco switch if we do show vlan, this command is supposed to ...
1
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0answers
116 views

Is the Foundry BR-FGS624P switch stackable by adding the 10GbE ports, or is it never stackable?

I'm looking at buying a Foundary BR-FGS624P 24 port switch which will suit our purposes now, but thinking into the future I might like to stack the switch when we add a few more servers to our rack. ...
1
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0answers
228 views

Tool to parse Dell PowerConnect switch configs to make them more readable and diff friendly

I've been working with many Dell PowerConnect switch configurations over the years, and even though their configuration console is quite IOS like, it doesn't manage configuration statements the same ...
1
vote
0answers
489 views

TP-LINK to HP switch connectivity issue

I have purchased 2 TP-LINK SG3424P switches to power PoE access points. Half of them are connected to one TP-LINK switch that is then connected through a trunk port to a Cisco 3560X and the other half ...
1
vote
0answers
241 views

stop arp poisoning on a 5448 powerconnect switch

We have to disable arp poisoning on our dell 5448 switch. Right now it has all our production machines running on it and I'm not a networking guy at all so I don't want to run a command that will ...
1
vote
0answers
2k views

Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?

If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card? ...
1
vote
0answers
143 views

How can I use multiple NICs on Windows Server 2008 function as a switch

I have a win2008 Server with 4 network ports (A,B,C and D) where only 1 port A is connected to the LAN (192.168.0.0/24). The other 3 ports (B,C and D) are not in use. I have another PC want to join ...
1
vote
0answers
774 views

HP E3800 switch to switch LACP connection dropping

I have a problem with 2 sets of stacked (2 switches in each stack) HP E3800 48 port switches. One set of stacked switches per rack for a total of 4 switches. I have a 4 port static LACP connection ...
1
vote
0answers
1k views

Ping starts, then immediately fails, to just one device on a network of 70+ and only from one part of the network! Super confusing

long-time reader first-time poster. I managed a network of 70 odd PCs connected to 3x different network switches (3 buildings all next door to each other). Looks like this: BUILDING 1 SWITCH -> ...
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0answers
301 views

Cisco 2950 Express Setup

I've been donated a Cisco Catalyst 2950 Switch by the company I work for to have a play with. I've reset it back to Factory Defaults, but having an issue with getting to Express Setup. I've followed ...
1
vote
0answers
324 views

Dell PowerConnect 5448 QoS policy based on TCP port specification?

I am working with a set of Dell PowerConnect 5448 switches where I'm trying to prioritize traffic for specific TCP ports/services. In this case, it's a production warehouse printing environment, and ...
1
vote
0answers
165 views

Duplicate packets on network after disconnecting wireless access point on separate VLAN

We have a network with a few switches. One of these is a 3com 4500, where there are many computers connected, a custom linux firewall and a wireless bridge. The port where the wireless bridge and the ...
1
vote
0answers
489 views

HP ProCurve & Cisco switches interoperability

I have a couple of questions regarding Cisco and HP ProCurve interoperability. Here's a link to pdf with my network topology. Can someone help me with basic VLAN configuration in such topology? Below ...
1
vote
0answers
856 views

Using Plink to script commands to Dell PowerConnect 6224

I'm trying to setup a simple script to update the configuration on a Dell PowerConnect 6224. I have SSH setup and working and can connect to the switch using either Putty or PLink but when I use ...
1
vote
0answers
240 views

Auto switching between wired and wireless connections

How about this situation. Our business deals a lot with medical information. And some of our clients have demands based off HIPPA, etc. There is one now where they do not want an employee to have both ...
1
vote
0answers
876 views

Max STP instances reached on Cisco 2950 despite not actively using 64

I have a Cisco 5505 switch running CatOS connected to a number of Cisco 2950 switches running IOS. The 5505 switch supports a large number of vlans (I'm guessing 1005), yet the 2950s only support a ...
0
votes
0answers
15 views

How can I tell if a cisco router is dropping pings due to DOS suspicion or if it's experiencing packet loss?

We use a PRTG server that's connected to a cisco 6500, which feeds a large network of about 1200 switches and radios in a router-on-a-stick topology. In PRTG I'm able to set a 'ping burst' sensor on a ...
0
votes
0answers
10 views

Getting L2 switch info from the data port on a Cisco IP phone?

Here's what I'm trying to do: I'm trying to get the information on which switch/port that a jack wired to. On that jack, there is a Cisco IP phone (7942), and a computer plugged into its data port. ...
0
votes
0answers
19 views

Brocade 6740T connect to management port

I'm having trouble connecting to the management port of my Brocade 6740T switch. Here's my setup: external network --> dumb switch --> Brocade 6740T --> servers | ...
0
votes
0answers
36 views

Vlan trunk between three switches and KVM Guests

I'am trying to find information regarding the appropriate configuration between three switches and KVM. More depth as per diagram. I need to create a tunnel for traffic created on sw1-port5 to be ...
0
votes
0answers
50 views

Getting chunks of high ms when pinging local / external IP addresses?

I am having difficulty identifying what a specific problem with one of your vlaned networks. They have a voip phone which regularly cuts out during long phone calls. I have done several ping tests ...
0
votes
0answers
60 views

Layer 3 switch redundancy solution (with vlan's, stp)

So basicly I have a setup which I want to get to work but i'm unable to. It's possible I am overseeing a lot of things but let's get to it anyways. The current situation is a network with 4 switches ...
0
votes
0answers
104 views

3Com 3CDSG8 Serial Console Input Not Working

I have a 3Com 3CDSG8 Office Connect Managed Gigabit Switch. I am trying to restore factory defaults. I don't have original rj45 to db9 connector cable. So i am trying to make a new one to connect ...