Cisco Switches :: Which Switch For POE And 7940G Phones
Jun 13, 2011
I have 2 (and maybe soon 5 more) 7940G phones to add to my network, which already has a Netgear POE capable switch. I've since discovered that early Cisco POE isn't the same thing as current POE, and the switch doesn't power the phones.
I was looking at adding a Cisco SD208P 8-port switch to power the phones, but I soon discovered it only has 4 POE ports, and I'm not sure that this switch will even power the 7940G phones. And if the other 5 phones show up, I'll need two of those switches with no room for expansion on the voice network.
Will this switch power those phones?Is there another small switch available so I don't have to replace my existing switch infrastructure to get these phones to work? Or do I need to scrap the phones and get something newer that will work with the current POE standards?
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Apr 10, 2012
According to the documentation, the Switches SFE2010P and SGE2010P have a maximun total power output of 360W. Using only SPA500 series IP Phones that have 10W maximun input, how many SPA500 IP Phones could be connected safely to this switches? 36 ? or 48 ?
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Jun 14, 2011
I have a new install with 3 SF300 switches, setup as vlan 2, the switch connected directly to the 2901 router has no problems, plug in a phone and it gets an IP, but if connected to either of the two swtiches behind the first switch, they do not get an IP. I am seeing the DHCP request hitting the router, and the router sending the IP to the phone, but it never gets the IP.
*Jun 15 10:40:20.040: DHCPD: client's VPN is .
*Jun 15 10:40:20.040: DHCPD: Sending notification of DISCOVER:
*Jun 15 10:40:20.040: DHCPD: htype 1 chaddr 40f4.ecef.bded
[Code]....
All ports are setup as trunk on vlan 2 including the ports that connect the switches together. Not sure what the problem is, but they are going live tomorrow and only have 48 out of 120 phones.
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Feb 16, 2012
I just got a refurbished ASA 5505.It works fine until un need to reload it or unplug it from power en replug it, when I do this and it's warm (even after some minutes of uses, so still physicaly cold while touching it), in this case, it simply reboot in chain withing 1 or 2 seconds. I have to unplug it from power and wait 5 minutes before replugging it to power.
I don't know if it's a problem from the power supply (that makes some noise, but I think it's normal), I tried loading more the power supply by plugin in some PoE device (Cisco 7940G) and it works fine, so it looks more like it's a problem on the ASA itself.
Must I send it back to the vendor? I tried updating the ASA image, but this don't changes anything.
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May 29, 2011
PoE works fine with C 1131/1141 Access Points and C-7975 IP phone but PoE does not seem to work on 7960 Phones nor on the C-1121 Access points
All devices work properly with the Cisco power injectors or on a Cisco Cat-29XX switch
Is there a trick to make PoE work for older devices ?
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Jul 14, 2011
I want to connect a 6911 IP Phone to a SG 300 switch. This is my scenario: vlan 3 data, vlan 9 voice, vlan 10 admin.I have a trunk on port 10 of the SG 300 (vlan 1 untagged, vlan 3,9,10 tagged) and it is connected to a switch 3560, this switch has all the L3 configuration of the vlans and the SG 300 switch has an IP on the admin vlan (10).Also i added the OUI of my IP phones an created an LLDP Policy. Right now I have a 7941 IP Phone working but 6911 is not working. Iam using the new version 1.1.0.73 that supports CDP.
Also I noticed that even when my PC and IP phone receive IP address they can not ping each other nor the SG 300. They only can ping the default gateway or IP addresses in diferent vlans but connected on 3560 switch.
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Dec 18, 2011
I have a question regard to switch SFE2010P, i have 2 vlan ( data and voice) and we want to configure Ip phones SPA502G, the question here is how can i make to suport 2 vlans on the same switch port, like the catalyst IOS switch port acces vlan x and switch port voice vlan x, if i set up the switch with the voice vlan like tagged doesn't work, but if i set up the voice vlan like untagged vlan its works but the PC attached to the data port on the SPA502G doesn't work?
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Oct 22, 2012
i am looking at quoting the SF302-08P for a client which will have three small offices interconnected via single mode fiber. I am planning on connecting them to a 3560 switch. Each office will have no more than 3 - 7942 phones. I reviewed the notes on this switch and it seems it should support this phone type without any issues.
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Aug 8, 2010
I have an ESW-500, a SPA525G (also tried 504G), Polycom IP330/670 phones, and a Switchvox (Asterisk-based IP-PBX) and CDP causes some issues.Both the SPA5xx and Polycom phones support CDP but it appears to operate differently between the phones. And, surprisingly, worst of all on the SPA's.
In short:
* Switch - CDP enabled (VLAN 100), DHCP disabled (Option 82 enabled) which is basically how it comes out of the box
* Polycom phones - CDP enabled (default)
* Cisco phones - CDP enabled (default)
* DHCP/TFTP server on port 1
* Phones on ports 7,15,19 - default as smartports for Desktop & Phone
* Switchvox on port 17 - port configured as General (not Trunk) with 1U & 100U VLANs. This was required to get Polycom phones to appear in Switchvox config
With that configuration the Polycom phones work perfectly. They appear in the switch web-GUI under CDP, they present in Switchvox and can be configured.But with that configuration although the Cisco phones appear in the CDP screen they do not get DHCP. My DHCP server can see 'DHCP Discover' messages but it just goes around in circles. Disabling CDP on the switch will allow the phone to get an IP but disabling CDP on the phone still has the same problem. When I saw "around in circles" this is what I mean....
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 00:25:84:06:12:46 [10/08 13:51:27.031]
DHCP: proposed address 192.168.100.16 [10/08 13:51:29.000]
4064 Request 2 not processed [10/08 13:51:29.062]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 00:25:84:06:12:46 [10/08 13:51:30.093]
DHCP: proposed address 192.168.100.16 [10/08 13:51:31.593]
4064 Request 2 not processed [10/08 13:51:31.656]
[code]....
With the difference being there's a 'DHCP Inform Msg' which there never is from the Cisco.I have tried many options regarding DHCP Relay, DHCP Server addresses, DHCP VLAN Interfaces, smartport settings etc but with CDP enabled the Cisco phone just will not get DHCP.
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Jan 4, 2012
I have a CUCM BE environment with a number of remote users with 8961 phones connecting to an ASA 5501 via AnyConnect. The phones register fine and can make inbound/outbound calls as well as four digit dialing to other users at the corporate site.
The problem is when a remote user tries to four digit dial another remote phone. The called phone will ring but there is dead air once answered and then the line goes dead.
This sounds like a routing issue to me. How to get AnyConnect clients to be able to reach each other?
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Sep 5, 2012
I am trying to hook up a SF300 switch to a cable modem and then plug some phones into the switch that are configured with static IPs. I am able to access the switch without an issue, but need it to pass traffic from the phones to the network and it is not doing so. We cannot do trunking because we are not using BSoD modems yet (next phase). For now, we just need the switches to pass everything from the phones to the network as is. Any ideas?
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Feb 15, 2012
I am having problem setting up SGE2000P switches to work with my default data VLAN and additional voice VLAN. I am configuring it to pick IP address for phones from voice VLAN which is working fine but when I connect a PC on phone port it is also picking up an IP from Voice VLAN while default VLAN is data with different scope of IP.
I pack these switches and purchase ESW 500 series. I have ESW 500 at another client and they are working fine out of the box but this guy is giving me hard time.
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Oct 23, 2012
I'm having some trouble with a 4510 Switch Line Card. I need some recomendations for troubleshooting it.We have some PoE phones connected to the card number 3. When those phones were restarted, they did not go up again. In order to discard wiring issues, we connected the phone directly to the card 3, and the phone did not go up. If the phone is connected to a different card, it goes up correctly.
Additionally, to restore the service, these phones were migrated to other cards, but when we disconnect the equipment, ports in line card 3 remain in an up / up state (and nothing is connected to those ports!!), and only reflect the actual state after restarting the port.What steps could I do in order to troubleshoot this issue?. What should I look for, or how do I discriminate the problem? Might it be a hardware issue, a PoE issue?
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Apr 15, 2013
I am new to VLANs although I generally understand the concept. I have a small office with 25 desktop/laptops and 15 VoIP phones connected with a SG200-50 switch and on Port 1 I have the Cisco SRP541W router for DHCP and Internet access. My goal is simple: 1) Segregate the VoIP phones (voice) from the computers (data) and 2) Prioritize the VoIP phones traffic.
I believe this can be accomplished by setting up a second VLAN and maybe a third (if the default should not be used) and then identifying those ports as Voice VLAN ports. I guess I just need to know how to flag each interface and each port so that they all can talk to the router on Port 1 yet the voice and data will be in different broadcast domains. Also, do I need a management VLAN??
Is this setup correct? VLAN 1 - default (data) Port 1 (Trunk) (Tagged)Port 2 - 30 (Access) (Untagged)VLAN 2 - voice Port 1 (Trunk) (Tagged)Port 31 - 48 (Access) (Untagged) What should the interface settings be on each port (General, Access or Trunk)? What should the port VLAN membership be on each port (Tagged or Untagged)??
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Apr 12, 2012
provide a sample Voice Vlan configuration for the Cisco 2960 POE switch to work with the Non-Cisco IP Phones?
Will these commands work? Vlan 2 is the new voice vlan, Vlan 1 is the data vlan.
mls qos
interface fastethernet 0/1mls qos trust cos switchport nonegotiateswitchport mode trunkswitchport trunk encapsulation dot1qswitchport voice vlan 2priority−queue outspanning-tree portfastspanning−tree bpduguard enable
vlan 2name voice
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Mar 1, 2012
I have 7 POE switches that have ESI IP phones attached. I have two VLANS, 1 and 2. VLAN 2 is used for voice and is defined in each switch.The ESI IP phones connect to my POE switch ports and the pc attaches through the ESI IP phone.
I have had voice quality issue between floors in my building. Talking to others on my floor via the IP phone, there are no voice quality issues. [code]
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Mar 16, 2012
I have a 300 series switch with VLAN1 untagged, VLAN 15,5,100 tagged. I want say ports 1-12 to use one uplink/trunk and 13-24 to use another uplink. All ports should have the same default VLAN1 and be tagged for 5,15,100. I'm trying to ease the load on two wireless uplinks(one is a Cisco 1242AG and the other is a UBNT PowerBridge.) I don't want to add another switch. Model: SF 300-24P
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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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Jun 12, 2011
i found that cisco small business SF302 PoE managed switch connect with the end device (RFID component) would causing packet drop issue.how should i isolate the issue and proper troubleshooting? would it cause by the PoE issue, or the 10/100 base etc.
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Jun 13, 2011
For test I used 2 Switch that name "ESW X" and "ESW Y" I have 2 network that I named "Network A" and "Network B" I build 2 VLAN for each network that named Vlan 2 for Network A and Vlan 3 for Network B, I don't use Vlan 1 because it's the default Vlan
Configuration ESW X:
port e1 : ACCESS PORT on UNTTAGGED Vlan 2
port e2 : ACCESS PORT on UNTTAGGED Vlan 2
port e3 : ACCESS PORT on UNTTAGGED Vlan 3
port e4 : ACCESS PORT on UNTTAGGED Vlan 3
port g3 : TRUNK PORT with UNTTAGGED Vlan 1(default) and TAGGED Vlan 2 and Vlan 3
[code]....
Each Vlan can't communicate between the two switch, I think they're a problem in my vlan/port configuration?
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Feb 12, 2013
I would like to configure a switch to act like a Hub. I know about the mirroring port configuration, but unfortunately is not enough for me. Is it possible to do that with the switch that I have (i.e. SG 200-08) ? If not do you know a switch on which I can configure it like a hub (that mean no flow control between physical ports).
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Aug 29, 2011
Have deployed a few of these - and am truly frustrated that I cannot see then in the topolgy, let alone actually manage them. Why such a ubiquitous switch is not supported.
Even the SmartPort utility is useless - CCA (3.3.1 and earlier) gives an error saying a port is incorrectly configured (I pluggged it into an exp port on the UC560 as I gave up trying to get a working uplink to an ESW-540-24P).
The Smartport port function wants the exp port (on the UC560) to be configured as a "Phone/Desktop" - if I try to change it to a "switch", it refuses to accept it saying the "Macro is unsuitable - or similar"
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Dec 11, 2011
I am trying to setup an ACL on SG 300 switch. I want to create an ACL that enables hosts on our guest network to obtain IP addresses from a server on our "internal" network but they should not be able to reach any other resorses on that network. I set it up as follow, but it does not work the way i want. I have also bind interfaces to the ACL.
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Aug 30, 2011
I am interesting is ESW-520-24-K9 switch supports GLC-LH-SM SFP? In official data sheet there is no information about that. it is supported and I am interesting if it is true ?
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Aug 10, 2011
ossible to connect a pair of switch serving the same segment (active/passive) into 1 switch?
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Sep 10, 2011
I am having an issue with LAG configuration on a Cisco SG300 52 switch. I have connected four Ge ports on the switch to the four NICs of a Dell R710 Server on which I installed Windows Server 2008 R2. Without LAG configured, these ports would forward traffic to and from the Dell server fine.However, if I configure LAG on the ports with LACP enabled, then they would not forward any network traffic. Debugging shows that the ports are up but their forwarding status show N/A. Am I missing any configuration? Can I configure LAG on edgeports?
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Jul 18, 2011
I have configured stack with 2 sge2010p switches. I want to connect this stack to the HP procurve switch using port agregation (LAG) technique. I want to use one ge port on each sge switch.How to configure it? Will it work witch port agregation on procurve?
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Oct 15, 2011
I have a SF 200-24P Cisco switch that seems to be rebooting constantly, When i connect it to mains power it seems to go through a startup cycle, in this order - i have tried this with no network devices attached and the same thing happens
1. Fan starts - continously runs
2. Very quick flash of all RJ45 ports.
3. After about 30 seconds, any network devices connected have an acticity light
4. After about another 45 seconds, all ports light up including the activity and POE orange LEDs for about 5- 10 seconds then go off.
5. About 10 seconds later the ports all light up again and stay on for about 5 seconds.
6. All ports go off and the cycle keeps repeating continously.
I have tried pinging the switch without success.I have also tried disconnecting all devices from each port with no success.At no time does the system LED on the left light up.I have tried resetting to factory default with reset pot on the left side.This is a brand new shipped switch from our cisco supplier, could it be DOA?
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Jul 10, 2012
Any way to access the usual command line interface instead of using the GUI or Telnet/SSH interfaces on the Cisco Small Business SFE2010P switch? Note that the console port is not working at the moment...
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Aug 21, 2011
I turned unplugged it and plugged it back in. Now its blinking green power LED. Is it dead?
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Oct 16, 2011
We just purchased 8 managed switches POE to swap out our existing in preparation for our new phone system. We installed them all after configuring with static IP. Deployed... and all but two work fine. Any tips for troubleshooting why two of them do not work? There are a couple other switches in the building. Could it be that a switch "upstream" from the two non-functioning switches is causing an issue? If so, how do I find out? When we put back the two "dumb" switches all was fine.
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Aug 22, 2011
SRW 2048-EU(webview) switch will support how many SFP minigibic whether 2 or 4 ?
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Nov 9, 2012
I want to create a network with the following switch SF 300 - 08.I am not use to GUI.I am having problems setting the settings.Currently, i have assigned each port with a vlan 1 to 8 for ports 1 to 8.How do i do an inter vlan with the GUI? Also, i want to restrict port 7 and 8 to certain ports only. Example:Port 7 and 8 can read port 5 and 6 but not others?
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