Cisco Switches :: How To Block SG300 10 Ports

Sep 30, 2012

I just recently purchased an SG300 10 port switch. After reading through many of the threads here, I was finally able to get the different VLANs to route properly. However, I'm having a unique issue that I'm not sure if it's related to the switch or not. I currently have 2 VLANs configured on the switch.ports 1-4 are native vlan 1 (192.168.1.X) ports 5-7 are VLAN 10 192.168.10.X (Trunk Port with VLAN 1 tagged and VLAN 10 untagged)I have a Hyper-V server connected to both of these networks. The VMs are running on both VLANs on port 5. I have the following problem:When I have a domain controller VM on VLAN 10, I notice that many of the DC communications failed. I took a network trace and noticed that many of the RPC port ranges were failing. I am able to ping all of the hosts on VLAN1 and vice versa. My question is as follows:Does this switch have some type of security option that blocks high range ports? I can't seem to find the menu option indicating that this is the case. I have already set-up a NETBIOS UDP proxy, but this hasn't worked much. I still have problems connecting to machines on this VLAN range.

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Cisco Switches :: SG300 - How To Block Management Access

Mar 25, 2012

I have a SG300 switch working in layer 3 mode. I created 3 VLANS and the intervlan communication is working fine. I want to know how to block acces to switch managment from the Vlans. One of the vlan is allowed to access the switch but not the others vlans. What is the best way to implement this? with ACL or with Managment Access Method, creating an access profile?

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CIsco Switches :: SG300 Or SG500 That Has All Ports As SFP?

Feb 14, 2013

Is there an SG300 or SG500 that has all ports as SFP ports?

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Cisco Switches :: SG300-28P - POE Not Correctly Supported On All Ports?

Aug 10, 2012

So, I spent some time this weekend troubleshooting the issues I've had  with the new SG300-28P switch and POE to many of my devices in the  office.  As a recap, I cannot utilize all of the 24 POE ports on the switch  for POE purposes.  Really only every other port [with a few odd  combinations thrown in between]. In addition, the SG300-28P switch, on occasion, is sending POE to non-POE devices [e.g. my Ruckus Zone Director 1106].
Here are my POE devices [all 802.3 af-compliant]: 3 Ruckus 7982 access points1 Pakedge access point2 home-automation controllers2 Polycom voip phones I called Cisco support several times in regards to this problem, and they figured it was a hardware issue - a faulty switch.  So, Cisco sent me a replacement SG300-28P, which I  hooked up today.  The exact problem still occurs.  Default configuration  [fresh out of the box].  No way I can land, for example, the 3 Ruckus  7982 AP's on ports 1, 2, and 3 [or ports 1,13, and 2].  I have to put  them on ports 1, 3, and 5 in order for them to power up.  In addition, I  can't plug any other POE devices on the ports either between or below  them.   I had to skip another port bay.  This is very odd behavior!!   Two Cisco SG300-28P's in a row with the same problem.
However, I also had one of the new Cisco SG300-10P switches in my  possession for a recent project of ours.  I decided to hook up the same  POE devices to this switch.  ALL POE devices were recognized and  worked!  No need to skip a port.  And it didn't matter what device was  plugged in first or not.  I am now convinced that it is either a  hardware issue [bad power supply/transformer?] inside all of the  SG300-28P switches, or a firmware issue. 
Both of the SG300-28P switches were running firmware 1.1.2 [the  latest on Cisco's website].  So, I decided to install an older firmware  version on the SG300-28P switch that I'm returning [installed].   Here's what I found out.  I could then plug 2 POE devices [e.g. two  Ruckus AP's] in adjacent horizontal ports, but not three in a row.  In  addition, not all adjacent ports.  It's funky. For example, I could plug  an access point in ports 20 and 21, but not in 21 and 22.  No rhyme or  reason in how it worked.  And I still couldn't plug an access point in  adjacent vertical ports [e.g. ports 1 and 13].  BUT...
It's interesting that the same exact switch that would not initially  allow 2 horizontally-adjacent POE ports to be utilized WOULD allow 2  horizontally-adjacent POE ports to be utilized when running a different  firmware version.   It's also interesting to note that when plugged into  a "non-working" POE  port, the SG300-28P would actually make a small whining noise.  Very  subtle noise; I could hear it when approx. 1ft away from the switch.   The noise was not noticeable when ports were skipped [and POE actually  worked].  Therefore, I believe that Cisco has some SG300-28P firmware  bugs [at least in the last two versions of firmware] that is not truly  allowing all 24 ports to utilize POE correctly.  This problem does not  exist with the SG300-10P switch.
In addition, I'd like to know when they think a solution could be  created if it's firmware-related.  If hardware-related, I don't think  I'll be recommending any 28P switches in our projects.  Perhaps just the  regular SG300-28 with a separate SG300-10P.  It's a shame because the  SG300-28P is more of a bargain when compared to the two separate  components.

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Cisco Switches :: Not All SG300 Ports Supplying Inline Power?

Feb 26, 2012

Essentially, not all ports on our brand new SG300-28P switches provide Inline Power to our older 7900 series phones. I can connect the phone a couple ports down and it usually powers up, but not always. Often I can also connect an 802.3af device to one of the troublesome ports and it will received power, however I am noticing there are some ports that now refuse to supply PoE at all?
This is equipment that has been running perfectly fine for several years now, on C3524 PWR XL switches. I can also tell you that this is not isolated to one switch, but all 5 of our SG300 access switches. And, yes, the firmware has been updated to

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Cisco Switches :: Change Admin Service Ports On SG300-10?

Oct 29, 2011

I recently purchased an SG300-10 switch. Is it possible to change the TCP port numbers for the administrative services on this device? For example, if I wanted to change the web admin port from being availble on port 80 to port 8080, or move the SSH port from 22 to 2022,  how would I do this?
I've looked over the web admin interface, and the Security > TCP/UDP services option looks like what I want, but I see no way to change a service's listening port. Is this possible?

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Cisco Switches :: SG300-28P Can Support 24 Ports With 154w Per Port

Mar 6, 2013

I want to know if the SG300-28P can support 24 ports with 15,4w per port at the same time.                  

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Cisco Switches :: SG300-52 Units Would Basically Disconnect / Connect Their Ports

Feb 15, 2012

We had a number of Linksys SRW2048 / SRW2024 switches that had the "bloated capacitor issue" or "bad capacitor issue".These units would basically disconnect/connect their ports.Applications would sometimes crash on workstations.These were all located at different client sites.These were replaced under warranty with the SG300-52 units.When we implemented the SG300-52 units at several sites we noticed the the logs showed disconnect/ connects.We were not seeing apps crash.Support advised they were not aware of any issues.We did a firmware update that was available that made no difference. ( months have now passed.

We noticed at our site very poor throughput one night doing a very heavy file copy data transfer between two computers.It actually ground all other computers on the network to a halt.We inspected the switch.It had "all lights flashing".We thought this strange and shutdown the whole system. Problem still existed.Power cycled the switch. Problem still existed.Noticed their was a new firmware update. ( implemented this.The lights on the switch stopped "all lights flashing".Throughput was back to normal. (ie didnt grind all other computers to a halt)

We then had a second site complain of similar issues.Heavy throughput between two computers bought all other computers to a grinding halt.Lights were "all flashing" on switch.Workstation would disconnect/connect in a loop during heavy file copy.We implemented the firmware update thinking this would solve the issue.It now still has the issue of disconnect/connect however and apps sometime crash.We have now replaced the switch with a HP 2510-48G.This is working properly.I have now since been to other sites that also have these SG300 switches and notice the "all flashing lights".

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Routers / Switches :: Block Multiple Ports On Only One Ip?

Oct 4, 2011

how can I block multiple ports on only 1 IP Address while not blocking those ports on other IP Addresses. I am using a Netgear WNR2000v1 which assigns the IP Addresses to each device.

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Cisco Switches :: SGE2010 Does Not Block Ports Even With STP Enabled

Jul 28, 2011

We are experiencing bridge storms and network slow downs and we believe we have traced the issue down to users plugging a cat 5/6 cable between 2 ports on the wall both wired back to a SGE2010 switch.
So we did a test - we plugged a single short cat 6 cable between 2 ports on a SGE2010, our access switch. Suprisingly, even with STP enabled, the switch DID NOT block one of the ports and in a few minutes the ENTIRE NETWORK was down, as CDP, STP, and ARP traffic became a multi-gigabit storm throughout the network.
Why on earth does this switch not block a port that is obviosly looped?
Every other cisco switch since I started on 1900XL's did this in 1999.

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Cisco Switches :: Trunk On SG300 Constantly Removing Ports And Adding Back

Mar 19, 2012

I have a Cisco SG300 switch on which trunks are configured. I have a server which sits on the switch via a trunk link of four network cables (4 Gbps total)on which LACP is enabled. I'm having trouble connecting to the server using VNC from a computer on the network. It doesn't happen all the time though, it's just random.

On looking at the logs of the switch, I saw something unusual. The trunk that connects the switch to the server is constantly removing all the member ports and adding them back again after a few minutes interval. That causes the trunk link to flip on and off all the time. What could be the reason that's causing it to happen? I know it could be the network cable but I'm using brand new cables and the server also is brand new.

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Cisco Switches :: SG300-28 GUI Different Than Online SG300-48 Simulator

Aug 29, 2011

These are our first switches and seems like GUI is lot different than the online. Out intervlan routing is o not working. I am absolutely sure that I setup the switch in L3 mode since it allows me to create mutiple interfaces. I am hoping that this GUI issue is related to interVLAN routing.
Below is the blog I started for InterVlan issue [URL]
This is the link for online simulator and what I see in its IP tab. I know this switch is not SG300. [URL]
This is what I see on our switch.
Our switch version
switchd64684#show version                                                                                                                                              
SW version ( date  19-Jun-2011 time  18:10:49 )
Boot version ( date  08-Apr-2010 time  16:37:57 )
HW version    V01

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Cisco Switches :: SG300-28P And SG300-52 Web Managing - Fans

May 26, 2011

1) I have a Cisco SG300-28P. I plan to add a SG300-52. Would it be possible to manage the new switch through the SG300-28P web browser ?

2) There are 2 fans in the POE model SG300-28P. How many fans are they in the non POE switch SG300-52 ?

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Cisco Switches :: SG300-28 Uplink To Another SG300-28?

Feb 8, 2012

Can I connect a single Cat5e cable between two SG300-28 and link them?  If so what must I configure?

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Cisco Switches :: Difference Between SG300-28P And SG300-52

Jul 25, 2012

I have SG300-28P that I am using as layer-3 switch. Recently I ran in to SG300-52 switch and even though loading same firmware doesn't give me option to do layer-3 switching. For SG-300 I see options in GUI to create vlan interfaces under IP information section, while SG300-52 has IP information option only under the management section.let me know if these are 2 different hardware types and L3 is not possible on SG300-52. If its possible to enable L3 switching on SG300-52?

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Cisco Switches :: Replacing 3COM 4500 Switches With SG300-52?

Nov 21, 2011

I'm replacing 2 3COM 4500 Swithes with the SG300-52 Cisco switch. We have 3 VLANs, 10, 20, 100. The switch is set for Layer 3 and I have setup DHCP relay. what settings i should set on the Cisco for the following setups:
3COM Setup
interface GigabitEthernet1/0/1


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Cisco Switches :: SG300 Switches Have Poor Performance In Layer 3?

Jan 1, 2013

We have several of the SG300 Serices switches. We use them to route VLAN traffic to Remote Offices, Internet Connections, and WiFi Access Points.In one remote office we have a SG300-10 setup to route the HQ Network and the remote Office Subnet. The SG300 is Connected to HQ via Fiber and has multiple Tagged VLANs on it. If I do speed tests over the Fiber Link on the Incoming Tagged Netwotk I get Decent performance, 80Mbs. If I switch to a networtk that is not priginating from HQ, and have the SG300-10 route packet, I get dismal performance. 15-20Mbs.
I Fireded up a New SG300-28P FW v1.2.7.76. Added a the HQ VLAN 101 and new VLAN 1025 . Mapped some Tagged and untagged ports for each.  Switch was connected to HQ Network as untagged VLAN 101.  I put a laptop on an Untagged VLAN 101 port. Ran some tests, cam back with 750-850Mbs. Great.  Put the same laptop on a Tagged 101 Port, Configured the NIC for Tagged VLAN 101, Same test, same Speeds, 750-850Mbs.I then  Configured laptop for Tagged VLAN 1025. Connected to tagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!
I then  Configured laptop for Untagged VLAN 1025. Connected to unagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!It was only the Laptop and the Connection to the HQ net on the SG300-28P. Why is the performance of this unit soooooo poor when it needs to route?Other Switches have FW v1.0.0.27 or FW v1.1.2.0. They have Similar speed issues. All Configured for Layer 3.

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Cisco Switches :: SG300 Switches Can Be Used With Microsoft NLB In Multicast Mode

Dec 18, 2011

does the SG300 switches can be used with Microsoft NLB in Multicast mode?I know on traditional Catalyst switches you can statically "map" IP's to mac's and then to multiple ports but this doesn't seem to work correctly on the SG switches - it gives an error about the mac not being not Unicast?

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Cisco Switches :: VLAN Management Via SNMP On SG300-10 Switches

Aug 7, 2011

Any snmpset commands to add, modify and delete vlan table entries on SG300-10 switches? I checked url... however this information is apparently only valid for catalysts. The latest firmware is installed and the provided MIB files are used.

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Cisco Switches :: Multiple VLANS And SG300-28P Switches Setup?

Aug 20, 2012

I'm going to have several SG300-28P switches to setup.  I'll need to create multiple vlans for data, voice, and wireless traffic.  I have the following questions in setting up this configuration:
VLAN 1 Management
VLAN 100 Data
VLAN 200 Wireless
VLAN 300 Voice 
1) For managing the switches via IP, will LAN1 be the default management network?  Should I create a seperate VLAN for managing the switches?
2) For uplinking the switches together, I plan to trunk a port to connect the switches together.  What's the configuration on the trunk port to forward all vlans from one switch to another?
3) On some ports, I want to configure a trunk for two vlans (Data and Voice) where the phone has a pass through for PC.  The phone supports tagging for the PC and the VoIP traffic.  For example on port 10, would VLAN 100 and 300 be set to tagged?

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Cisco Switching/Routing :: SG300-10 - Special Ports 9&10?

Jun 6, 2012

I just purchased an SG300-10 (negular, non-POE) and planning on using it with no special configuratinos initially. Longer term, will be using VLAN and QOS for VOIP.What I would like to know is if ports 9 & 10 can be used as standard copper cat5e ports, or are they only useful for special purposes?  When I hookup my router/firewall to port 1 it all appears to work.  If I hook it up to 9 or 10, the port lights do not come on and it doesn't work.  I read that ports 9 & 10 don't have POE on the POE switch, but I assumed that all 10 ports would function with cat5e?

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Cisco Switches :: SG300-52 Multiple Lags Between Switches?

Jan 19, 2012

I'm having alot of trouble trying to connect more that one LAG between two SG300-52 switches.Basically i have configured both switches with the same vlans. For 2 of the vlans i would like to connect them together between the two switches using LAG. Switch1 has Vlan 5 (ports 1-12) & Vlan 10 (Ports 25-36) with LAG configured on ports 1-2 and ports 25-26. I have setup the second switch identical to the first. But when i connect the LAG's there is no connectivty. If i disconnect one LAG the other starts working.Can you only have i interconnect LAG between switches?

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Cisco Switches :: How To Configure Two Links Between Switches SG300

Apr 22, 2012

I have two SG300 serie switches and two Gigabit connection between them. How do I configured these two links to work toghether like a one 2 Gigabit channel?

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Cisco Switching/Routing :: Is SG300 52 Ports Sufficient For Network

Nov 8, 2011

I need the conception of the local network for my company. I have seen the sg300 switch that can be good for me (excuse my bad english, i am french). I have 12 servers (database + file servers) that i want to plug on the sg300 20 ports. I want to plug on it 3 switch sg300  52 ports that contains ipphone, desktops and  printers. (about 70 users)

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Cisco Firewall :: 5505 - Block Everything Except A Few Ports

Apr 15, 2013

We have a client that is running a PC on a internet over satellite. To avoid any unessecery traffic over the satellite link (data traffic is quite expensive), we've suggested to use a 5505, as we had one handy already.
So basically what we wanted was to block everything outgoing and everything ingoing, except for example port 22 (ssh).
But I'm struggling a bit, since this is my first cisco router to be configured.
My interfaces are as follows.
Outside - DHCP
Inside (port 1) -
I'm only running ipv4.
in ASDM I made a static NAT rule for port 22, being forwarded to (the computer)
in Access rules I made under outside (incomming rules) source=any destination=outside service=ssh action=permit
But when I try to add further rules to block everything else, it takes the SSH on port 22 with it. How should I do this the easiest way?
the hardware setup is pretty straight forward.
sat-terminal(with IP running DHCP)   ->  5505 (outside IP=DHCP - inside IP=   ->    computer (IP=

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D-Link DIR-655 :: Unable To Successfully Block Ports

May 25, 2011

I have been trying to block access to Steam and Left 4 Dead 2 on a specific computer, using the correct listed ports and using the port forwarding section of the router (setting the access to deny) however they seem to still be able to access both steam and L4D2 on their I can still block the access?

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Cisco VPN :: Adaptive Security Appliance Asa 5540 Unable To Block Server Ports

Aug 10, 2011

I was configure IPSEC vpn on ASA5540 and i have problem with port blocked.  I am unable to block server ports to remote users.See below configuration.  I need to configure vpn filter list but don't know how to configure vpn filter list.

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Cisco Switches :: SGE2010 Can Use 4 SFP Ports And Stack Of Two Switches At Same Time

Feb 15, 2012

I looking to buy SGE 2010 swith, but I have some question:

1. Can I use 4 SFP ports and stack of two switches at the same time.
2. Is it possible to use for stacking  ports other than 24, 48?
3. What is maximum possible number of ports  to use for stacking (can I get more than 1Gb thruput).

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Cisco Switches :: VTP And STP On SG300-28 Switch

May 9, 2011

I have a question, does the SG300-28 support VTP and STP?. I want to add it to my network's VTP domain so I don't have to manage vlans manually on the SG300-28 and also be able to configure STP to keep my network loop free.

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Cisco Switches :: Set Up LAG Between SG300-20 And SRW224G4P

Jul 19, 2012

On my SG300 I set up LAG for the last two ports.
I then plugged them into my SRW224G4P, once I do that I get dropped packets.
I was thinking maybe doing firmware upgrades to both switches?

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Cisco Switches :: How To Assign SG300-10 To VTP

Jan 29, 2012

I need to know how to configure each port in switch SG300-10 to vlans, i need to configure one port "trunk" with catalyst switch and assign 4 ports to different vlans. any solution?

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Cisco Switches :: Does SG300-10 Support RIP

Jun 20, 2012

In the CLI documentation for the SG 300 Series, it shows sh ip route rip as a command. I have installed the latest firmware and that command is no longer available. Does the SG300 series support RIP?

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Cisco Switches :: SG300-10MP Keeps Going Down?

Jan 27, 2013

We purchased a SG300-52 last week to replace a 5yr old Dlink which has worked perfectly. 1 day after the SG300 went it it started crashing with this fatal error problem so I reverted the firmware back from (latest) to but I still get the problems.  It crashes when I have it on my lan with users connected or if I just have the switch on my desk with just my laptop connected, so it cant be a load issue or a network topology issue.  I already have a Cisco SGE2010 on my network without problems.

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