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

[Code].....

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Cisco Switches :: SG300 Trunk With 3com 4800G?

Oct 25, 2012

Our company currently have a 3com 2816 connected to a 3com 4800G through a trunk.  The 4800G connects to the PBX and to the ip phones/computers. We are currently using vlan1 (192.168.100.n) for data and vlan 3 (192.168.101.n) for voice , Ip addresses are being issued by a DHCP server. Each user has an assigned IP phone and it has an ethernet port that connects to each computer. This setup has been working properly until I purchased an SG300 and replaced the 3com 2816.
 
The ip phone is showing a bad gateway and the PC are getting an ip address of 192.168.101 (which is for voice). Theoretically it should work, but what is weird is, it seems the SG300 trunking with the 3com 4800G is not working. Is it possible that it is on ISL mode rather than dot1q?I also saw its running RSTP, should I changed it to classic STP?How do I fix this or what troubleshooting should i do?
 
The SG300 is configured as a layer 2 switch. Configuration for the trunk below:
 
interface gigabitethernet27
spanning-tree link-type point-to-point
switchport trunk allowed vlan add 3-4
macro description switch
macro auto smartport type switch $native_vlan 1

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Cisco Switches :: Configure Port To Connect SG300 To 3com Unmanage Switch?

Apr 1, 2012

I have my network with severals SG300 switches.I have one of them like my core switch working in layer 3 mode. With 2 vlans and vlan interfaces to each vlan.Everything is working ok.But now i have to connect one 3com unmanage switch that have host from vlan 1 and 2. How should i connect this switch to my Cisco sg300 switch?

[code]...

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Cisco Switches :: Replacing Some Netgear Switches With SG200

May 16, 2012

We are replacing some netgear switches with the Cisco SG200.  The situation is relatively straightforward.  We have a series of VLAN's coming in on a trunk from a service provider for our Metro Ethernet locations.  These trunks then get cross-connect to various location for connectivity.  The problem we have is there are two VLAN's that need to go to the same switch which provides access to our public IP block.
 
I set up the two VLAN's on the SG200 with the trunk port VLAN tagging on the service provider port.  Then I set up a separate port for untagging the traffic with the PVID of the respective VLANS's as follows: [code] The public switch has no VLAN's configured (it is an SG200 too).  If I connect GE2 to the public switch everything works fine.  When I connect GE3 to the public switch, things die.  I thought this might be caused by STP although STP should not be detecting issues like this across separate VLAN's.  Disabled STP, no change.The same configuration with the Netgear worked without an issue.  FYI, the VLAN's cannot be changed...they are defined by the service provider in this particular case.  otherwise we'd just make them the same..

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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 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 :: Using 1240 AP With 3COM Switches

Feb 23, 2012

I have several autonomous 1240ag AP's that I need to enable a second ssid(Guest and VLAN2) for guest access and while I have configured the AP's according to the driections, I am not able to connect to the second ssid(Guest), but it is broadcasting. When I check the logs, I do not even see my laptop or any other device for that matter, trying to authenticate, what am I missing? I can see, connect and get an IP from the first ssid(Production and VLAN1), which is on the native VLAN and my 3COM 3C17203 switch port(14) is tagged for both VLAN's. Although I am sure that this would work better with a Catalyst switch, but it is not in my budget to replace all 4 of these, but I need this to work.

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Connecting Two 3com 2920-SFP Switches?

Jan 11, 2012

I'm adding a 2nd 3com 2920-SFP switch to our network, and was wondering how to connect them up in series(?) for more available user ports. They have 4 SFP ports, and wanted to know if this was how its done.

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Cisco Switches :: Fiber Connection Between 3Com 5500G EI And SG-300

May 30, 2012

We’ve just begun the transition from our old 3Com switches to new Cisco switches and we’ve encountered interoperability problems as we start the transition.Goal:  Extend 6 VLANs (each representing an IP subnet) via fiber from a port on the 3Com 5500G-EI to a port on the Cisco SG-300-52

We assign an IPV4 address to the Cisco SG-300-52.  We can successfully ping/web-manage at this address if we do a temporary copper jumper from a 3Com switch to the Cisco.  IP address is in the subnet assigned to VLAN7•2)      At the 3Com side, the fiber port is set as “hybrid” and is passing VLAN 1 untagged; VLANs 3-8 tagged•3)      At the Cisco side, the fiber port is set as “trunk” and is defined with VLAN 1 untagged and VLANs 3-8 tagged. 

If I try to change the management interface on the CISCO from VLAN 1 to VLAN 7 (as I would on the 3Com), I lose connectivity over the temporary copper connection•B)     

If I remove the temporary copper jumper from the Cisco (keeping the “working” management IP address) and create the fiber link between the 2 switches, I lose connectivity to the management IP , If I set the 3Com fiber port to “access” and make the fiber connection, I can ping the management interface – but of course, I can’t pass the other VLANs to untagged access ports on the Cisco – and it has the fun side benefit of messing with IP management settings on other 3Com switch stacks attached to the 5500G-EI.  However, it does demonstrate that we can get network traffic communicating over the fiber link between the 2 switches.

How I can proceed to a) have the management IP address in the IP subnet defined on VLAN 7 while passing the other VLANs to access ports on the Cisco?  BTW, I’m a networking neophyte (it’s a very small part of my job and I do it infrequently), so I prefer to use GUI management to CLI options, although I can perform CLI configuration if presented with the right commands.

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Cisco Switches :: Possible To Stack 3Com 3cr17161-91 With Another Layer 3 Switch

Sep 25, 2012

I would like to ask if it is possibe to stack a 3Com 3cr17161-91 to a layer 3 Cisco Switch? The two will be stacked using the avaialble SFP modules.

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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    1.1.0.73 ( date  19-Jun-2011 time  18:10:49 )
Boot version    1.0.0.4 ( 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 Switching/Routing :: 5500g 3com Switches - Spanning Tree

Jan 10, 2013

I have problems too when I connect 3com and Cisco.
 
I have 2 5500g 3com switches connected with 2 links. If LACP is disable, this causes serious problems and STP not works.
 
Logically , the link, is a port trunk with all the vlans permitted. One switch has STP enable and the other RSTP. Why this not works fine? I need to configure MSTP maybe? PVSTP is not allowed on this switches.

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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 WAN :: 4500 Switches With Supervisor 6E-L

Jun 8, 2011

we got 2 Cisco 4005 Switches with IOS 12.x. t.Now we have two new Cisco 4500 Switches with Supervisor 6E-L.But i dont really understand the new syntax / configuration method of ios 15.

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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 1.2.7.76 (latest) to 1.1.2.0 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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Cisco Switches :: ACL Binding On SG300 28P

Mar 15, 2011

I have a question about ACL and binding. I have a SG300 28P and a couple of other linksys switches and Access points that are connected to it via trunks. The cisco SG300 28P  is running in layer3 mode and i have created a couple of vlans and one of them is a guest vlan. Now to my question, i create an ACL and an ACE that vill funktion so that guest vlan only can connect to the internet and not the rest of the internal network. And then i must bound the ACL to an interface port or lag, what i can see it is not possible to bind it to an vlan? so if i have a port on some of the other switches that is member of the guest vlan, vill the ACL on the SG 300 stop guest vlan trafic to the internal network that is comming from some of the other switches?

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Cisco Switches :: SG300 - Set Up VLan Only For Wi-Fi APs?

Mar 25, 2012

I want to set up a vlan only for the wifi APs and wifi clients on my network. They can't access to any server, only internet acces. I already implement this configuration and its working, but now I want to allowed a couple of laptops to connect to servers in other vlan. what should I do? Should I do it using Mac address of laptops or IP?

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Cisco Switches :: SG300-10P SYN Protection

Mar 1, 2013

Yesterday I upgraded my SG300-10P to firmware 1.2.7.76. I was curious about the new SYN Protection feature, but it seems to do nothing on my installation.
 
The switch is running in Layer 2 mode. I have ACLs in place and DoS prevention is not enabled. I also tried clearing ACLs and enabling DoS prevention. As I understood the Admin Guide enabling DoS in the Security Suite Settings is not necessary for using the SYN Protection.
 
In my firewall I see about 300 pps with SYN flags only arriving. What "they" do is sending me SYN packest to port 80 from forged IPs, so that my system should send SYN-ACKs to the victim system. In this case it is the Arab Bank. They are down at the moment...I think that is called a spoofed SYN flood attack.
 
So I thougt the SYN Protection feature should exactly solve that problem but it does not and does not show any "Last Attack" entries.
 
If I put a SYN filter in place it works, even if I put SYN Rate Protection in place. But that is just a dirty workaround. My firewall blocks those SYN packets with a SNORT rule.

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Cisco Switching/Routing :: QoS In L2 Switches 2960 And 4500?

Mar 12, 2013

We have 3 layer LAN architecture, layer 1 of 6500(IP routing), layer 2 of 4500(L2 switch only), layer 3 of 2960(L2 Switch)In a Single (2960 and 4500) Switch Port Avaya IP phone and PC are connected.Now, the requirement is that, Qos need to be configured for Voice traffic and Data traffic should be in default class of service.We plan to use COS value in Switch 4500 and 2960. We made a sample configuration as below 
 
### For 4500 Switch
 class-map match-all VOIP-Access-2MB
  match cos  3  5
class-map match-all VOIP-Uplink-20MB
  match cos  3  5

[code].....
 
check these configurations are correct as per standard and if there is any other method of configuration?What need to be configured in L3 Switch(6500)??In 2960, it doesn't support ingress QoS, what impact it will make when compare to 4500? do users experiance any difference?

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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 :: VLAN Config On Sg300?

Jan 26, 2012

I am using a couple cisco sg300 28P switches along with a sonciwall firewall/router. The sonicwall was already in place and working so they didnt want to replace it. I understand how to configure the vlan on the sonicwall, but could use some info on the cisco. I would basically like to create 3 vlans, 1 default for management, 2 for pc's on lan, and 3 for the cisco spa504g phones/'voip. Would i just go into the vlan managment, configure the 2 new vlans and give them two id's? These offices have one network drop, so the phones and pc's will be sharing the switch ports, however the phones have a setting to configure the vlan id so they know which one theyre on. Is there anything i need to do after that? I want to make sure that vlan 3 has the highest priority becuase its voice, is there some qos configurations i need to make on that switch as well? Also, the port that links the two cisco swtiches together, does that need to be set as "trunk" port? I understand what vlans are, but its just the first time ive run into these cisco models. .

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Cisco Switches :: SG300-10 IPv4 Routes Bug?

May 10, 2013

I bought the SG300-10 Switch a few days ago and updated it to firmware 1.3.0.59, but i think there's a bug in this firmware. If I go to "IP Configuration" IPv4 Routes" in L3 Mode nothing is displayed. In the log file i see that:
 
21474773112013-Mar-16 09:51:34Error%HTTP_HTTPS-E-DIAGNOSTICS: ERROR - in <RL_vtLeadTableGet> tag, can not find the table rlInetRoutingDistanceTable in the MIB.       21474775182013-Mar-14 22:39:22Error%HTTP_HTTPS-E-DIAGNOSTICS: ERROR - in <RL_vtLeadTableGet> tag, can not find the table rlInetRoutingDistanceTable in the MIB., aggregated (1)               
 
Reset of the Switch doesn't work.

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Cisco Switches :: SG300-10MP Keeps Crashing?

Sep 4, 2012

We are in an organization of 80 users with 5 Sx300 series switches with the latest firmware (1.2.7.76). The network is mostly flat with all switches feeding into a Cisco ASA5505 acing as the primary gateway for Internet Access. Only our two 48 port POE switches have an additional vlan configured for the VoIP phones. We have one SG300-10MP that is powering 5 Cisco Aironet 1024N's that keeps crashing. A couple weeks ago it went down twice in one day. I updated the firmware and it did not have any hiccups unitl today. This issue has been consistent since we installed the switch in April. Originally the issue seemed to be caused by too much bonjour traffic causing a buffer overflow (we have over 100 Apple products). Since I updated the switch I have not seen any bonjour buffer overflow errors. Instead I get the following error when it crashes:

2147424534 2012-Sep-05 15:12:28 Emergency %SYSLOG-F-OSFATAL: FATAL ERROR: tExcTask: ABORT DATA exception ***** FATAL ERROR ***** SW Version : 1.2.7.76 Version Date: 19-Jul-2012 Version Time: 17:54:43 Instruction 0x18 Exception vector 0x10 Program state register 0x80000092 %SNMP-I-CDBITEMSNUM: Number of startup configur ation items loaded: 133 %LINK-W-Down: gi1 %LINK-W-Down: gi2 %LINK-W-Down: gi3 %LINK-W-Down: gi4 %LINK-W-Down: gi5 %LINK-W-Down: gi6 %LINK-W-Down: gi7 %LINK-W-Down: gi8 %LINK-W-Down: gi9 %LINK-W-Down: gi10 %LINK-I-Up: gi9 %LINK-I-Up: Vlan 1 %LINK-I-Up: gi1 %STP-W-PORTSTATUS: gi9: STP status Fo

The CPU and PoE supply are far from being overloaded.

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