Cisco Switching/Routing :: 2950 DTMF Not Working On Voice Vlan
Nov 9, 2011
i am facing a strange issue on cisco 2950 .IOS (tm) C2950 Software (C2950-I6K2L2Q4-M), Version 12.1(22)EA9, RELEASE SOFTWARE (fc1) suddenly my phone stopped working for DTMF tone, i mean when i dial a conference bridge lets say 6565 and then it ask for conference bridge code lets say 12345, it doesnt recognize the code and says code is invalid, SIP Proxy is Asterisk in this case.Currently my cisco switch port is configured for dual data + voice vlan, where DTMF dont work, sample config below [code]
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Dec 4, 2011
I'm using CISCO 3524 switch as access switch and trying to enable voice vlan in fast eth ports as below.
L3 vlans are created in core switches which is cisco 6509
vlan 1 - data vlan
vlan 2 - voice vlan
in cisco 3524
[code]....
if i use the above configs, the phone which is connected to interface fa0/1 is not taking ip from dhcp server. even it didn't work with static configs.while troubelshooting, i have configured as below and it's started working..
int fa0/1
switchport acces vlan 2
speed 100
duplex full.
in this case i can't use this port for data connectivity where as it's required for data too.
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Apr 9, 2012
I have CME on Router 2800 series, and switch 2960 PoE connected to this router.On 2960 switch, there is existing 7945 IP Phone that already work properly and get IP 14.x.x.x from voice vlan 2.
Problem is when I add cisco 6921 IP Phone connect to 2960 switch, it get data vlan 10.x.x.x, not voice Vlan 14.x.x.x I have check CDP and it use CDP v2
Config on 2960:
interface GigabitEthernet1/0/34 <--- this is connected to IP Phone 7945
switchport mode access
switchport voice vlan 2
spanning-tree portfast
[code]....
With same config and condition on port 2960, why the IP Phone 6921 can't get voice vlan 14.x.x.x, whereas IP Phone 7945 can get voice vlan 14.x.x.x
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Nov 10, 2012
I have encountered a different issue. When I configure " switchport voice vlan 2" under f0/2 connected to ip phone, it does not have any effect.
Below is my set up:
Sw is cisco cat 3524 XL.
ip phone-------f0/2( vlan1)-----SW----f0/1---trunk------f0/0-CME-router+dhcp
|
f0/3( vlan2)
tftp server ( 201.201.201.3)
switch has two vlans:
vlan1 (data) 200.200.200.0/24
vlan 2 (voice) 201.201.201.0/24
Switch management int vlan 1 : 200.200.200.3
router
f0/0.1 200.200.200.1
f0/0.2 201.201.201.1
The trunk is working correctly. (code)
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Jun 4, 2013
If we configure a Voice and Data VLAn on a switch. And connect EX90 on voice VLAN and PCwith EX90 terminals. Than can we able to share a presentation or data with EX90 or not?
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May 16, 2013
im working in a new enviroment and want to makes some design changes to the environment. I wanted to bounce my ideas some of you folks to see if my thinking is on the right path or maybe i could do things better.
Setup:
Currently the setup that i manage includes and Sonic Wall (also dishes out dhcp), HP 1810 "Core Switch" and 3 SG 300-28P cisco managed switches. (all cisco switches tie back into the HP) The router is managed by the isp. There is only one vlan with all traffic going across it.
Obviously the glaring issue here is that voice and data all reside on the same vlan. Correct me if i am thinking incorrectly but the first step would be to create a separate vlan for the phones with its own IP scheme. currently phones are issued addresses from the 150-200 range and everything else is left for pc's, printers etc. To my knowledge the HP switch does layer 3 but i do not know much about it. There are vpn tunnels to remote offices that are used for sharepoint, email and to access other services. Trying to wrap my mind around the environment as a whole so i may be missing something obvious i could do design wise to improve.
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Apr 27, 2012
Stumped again with my Catalyst 2950. Everything is working perfectly with wan/dhcp/router on fa 0/1 with all ports assigned to vlan1. All devices plugged in connect to the router correctly with ip's being assigned via dhcp.Instead of hooking up by console port I want to be able to SSH or telnet in to the switch using any port while still maintaining the above functionallity. Is it possible to assign a dhcp assigned ip address to vlan 2 and have vlan1 and 2 bridged? Or is there a better way of doing this ?
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Jul 4, 2012
spam up the boards with the same basic CCNA level stuff, but I have a couple of questions about ios differences, limitations, and references. I have the following three switches. One appears to be considerably dated in regard to software version. My confusion/ignorance stems from managing VTP settings.
2924XL 12.0 5 WC8
2950 12.1 22 EA6
2950 12.1 22 EA6
When I set either 2950 switch as the VTP server, and the other as a client, the client inherits the server settings as expected. However the 2924 requires that I go into the vlan database from priv exec and manually set vtp client. That's pretty similar to setting any switch to client mode. The problem I am observing is that after setting the 2924 to client, it still doesn't inherit vtp version settings or pruning settings. I still have to manually configure those. Additionally, if I copy run start the 2924 after making these manual settings, and then reload the switch, all the settings are lost and it defaults back to server mode with all features disabled. From my searches, it looks like vlan information is stored in vlan.dat, but all the documentation I've found is on 12.1 ios which doesn't appear to use vlan database for vtp setup, meaning it might still be an issue, but not one I'm focused on at the moment.
Is the vlan database dumped at reload? I've read vlan.dat is stored in nvram and should be saved after a copy run start, but that is not the case for me.I have since set the 2924 as the server, manually configured the server from vlan database, executed copy run start, and reloaded the switch. Oddly, my manual settings saved from the reload, meaning I only lose settings when the switch is in client mode.Am I missing additional necessary client commands to save the config, or is this just a limitation of either the 2924XL or the 12.0 ios?On a related but completed out of scope topic, without a cisco service contract, how am I supposed to make heads or tails of all the different versions of ios, along with the letter-based features and what-not? I can't even find my 2924 in the list of platforms when searching for ios upgrades.
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Dec 11, 2011
We have a group of computers on their own VLAN. A router allows internet access while keeping them sandboxed. We don't want them accidentally connect to our production network. We blocked their wireless MACs in unauthorized WAPs. I'd like to do the same thing for their ethernet MACs on our switches, (a mixture of 2950,2960 and 2960G currently testing on C2960-LANBASE-M, Version 12.2(25)SEE2). I've been unable to locate the correct method on google, by searching these boards or in the command reference.
What is the best practice for blocking a group of MACs from accessing a particular VLAN on a network consisting of several Layer 2 Switches?
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May 20, 2010
For many years we've had the following vlan and port security config on our 3560s: [code] This has worked great on 12.2(37)SE1, 12.2(40)SE and 12.2(46)SE. However since 12.2(50)SE, and I've tried all the versions since then, we have a problem with 7900 phones and ATA186s taking upwards of 20 minutes before they can get a valid IP number.The problem on the newer IOSes seems to be related to the inactivity aging.On the older IOS versions the mac address of the voice device appears on the voice vlan straight away.
On the newer IOS versions the mac address of the voice device appears on the DATA vlan and seems to be stuck there until the inactivity aging removes it. It then gets re-learned, sometimes on the voice vlan, and sometimes on the data vlan. If you're unlucky and it gets re-learned on the data vlan you've got to wait until the inactivity time ages the address out again. Repeat until the mac address eventually gets learned on the voice vlan. I don't want to be stuck on 12.2(46)SE forever.
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May 14, 2012
I am trying to write an extended ACL for the voice vlan.My scenario is the following:I have two PBXs with two Catalyst 4505 L3 switches.The C4505 are connected trough a trunk link.I have a VTP domain configured.
Voice VLANs are Vlan 100 and Vlan 101 with networks 10.2.0.0/16 and 10.4.0.0/16 Voip telephones are communicating between them self and everything is working fine.I want to secure both voice VLANs with an ACL to allow only couple of IPs to administer the phones.The PCs are connected trough a integrated switch via VOIP telephone.Here is the sample configuration of the dhcp pool for the PC VLAN:
ip dhcp pool PCs
network 10.1.0.0 255.255.0.0
default-router 10.1.1.1
dns-server 10.10.10.1
option 43 hex 010a.5369.656d.656e.7300.0000.0204.0000.0064.0000.0000.00ff
I had to implement the 43 hex option because the PCs did not get the ip from the DHCP because of the vendor specific information.The thing that worries me is will the DHCP forward the ACKs for the PCs if I implement this test ACL:
ip access-list extended VLAN100
permit ip 10.2.0.0 0.0.255.255 10.4.0.0 0.0.255.255
permit ip 10.4.0.0 0.0.255.255 10.2.0.0 0.0.255.255
permit ip 192.168.2.0 0.0.0.255 10.2.0.0 0.0.255.255
permit ip 192.168.2.0 0.0.0.255 10.4.0.0 0.0.255.255
permit udp host 0.0.0.0 eq bootpc host 255.255.255.255 eq bootps (this I am not sure do I need)
permit udp host 255.255.255.255 eq bootps host 0.0.0.0 eq bootpc (also this)
deny ip any any
I only want to allow the network 192.168.2.0/24 and maybe some other hosts to access the web based http gui to adiminister the IP phones.All PCs are connected trough the VOIP terminals. I do not want to deny the traffic to PCs.
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Apr 8, 2012
Randomly when I try to access to 2950 from management tools, switch is unreachable, I have to access from other switch and reload 2950.
Problem only is from managemt tool to managament vlan 1 2950.
The strange thing is that management interface is encountering a very fast increase of throttles, broadcast and ignored packets:
2950#show interfaces vlan 1
Vlan1 is up, line protocol is up
Hardware is CPU Interface, address is 0023.3488.fd65 (bia 0023.3488.fd65)
Internet address is xxxxxxxxxx
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
[code]....
It could be a hardware problem?, IOS has been upgraded.
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Oct 11, 2010
Any way to test in a lab what would happen if a tech mistakingly added "switchport voice vlan XX" to a trunk port? I am try to do some RCA on an issue and this has been identified as a possible cause by one of my techs.
The config is Switch1------Switch2--------Switch3 Each interswitch connection is configured as a dot1q trunk with all vlans allowed. The link between switch2 and 3 is where switchport voice vlan 10 was added. Switch1 is a 3750 and 2/3 are 3560's.
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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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Feb 12, 2013
I am configuring DHCP pool for voice vlan on cisco 2921 router.
Here is the setup.
2921 router -> 3750 -> 2960 PoE -> 7942 IP Phone
Router Config
ip dhcp excluded-address 10.146.54.1 10.146.89.50
!
ip dhcp pool VoiceVlan
network 10.146.54.0 255.255.255.0
subnet prefix-length 24
dns-server 10.144.68.32 10.144.68.33
option 150 ip 10.146.68.36
default-router 10.146.54.1
netbios-name-server 10.144.68.32 10.144.68.33
netbios-node-type h-node
[code]....
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Nov 3, 2011
In my lab, there are some machines that are connected using Cisco 2950 switches. Those machines belong to a VLAN.Now I need to modify the VLAN settings of the machines and as such I also need to modify the VLAN settings on the ports on the Cisco switches.
In order to do this, first I need to login to those switches, but due to a lack of knowledge transfer, I don't have the password. Is the some generic password?Second I will need to modify the VLAN settings on each individual port. How can I do this?
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Sep 17, 2012
I have a Cisco 6509 with IOS "s222-ipservicesk9_wan-mz.122-18.SXF16.bin"I need to enable dot1x on user's ports on the switch. each user is connected to the switch through the IP phone.
I just found out that I can not enabled dot1x on trunk port. I have tried to use "switchport voice vlan " but I got:
Switch(config-if)#switchport voice vlan 123
Command rejected: Gi7/20 is Dot1x enabled port.
let me know what should I do to get dot1x working?
Note: I have connected a laptop directly to the port and dot1x is working fine.
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Nov 4, 2012
we are using 3750 and 2950 switches both of them do not support vlan up to 4000 .we need vlan about 3000 .Whic cisco series switch do support vlan up to 4000.
2950
S-SW1.3(config-vlan)#exi
Proposed configuration has too many VLANs for this platform. Reduce the number of VLANs proposed.
S-SW1.3(config)#end
3750
SW1(config-vlan)#exi
proposed configuration exceeds the limit of 1005 VLANs that can be supported on this platform. Reduce the number of VLANs proposed to be within this limit.
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Mar 7, 2012
I am looking into the possibility of using private vlan's for some dmz implementations however I do have what may be some very rudimentary questions. It seems straightforward how to configure the primary/secondary vlan configuration as well as associating them. However in my case I would be looking to configure the PVLAN on a 6500-vss platform acting as the router while all of the hosts which I would desire to have in the isolated vlan would be spread out across a number of older Cisco switches which only support "protected port" setup or Procurve switches all of which I do not have budget to replace with something newer. So in my scenario I would have a 6500 connected by trunk to multiple switches which only support a protected port setup such as a Procurve (top of rack) or a Cisco 2950. As the Procurve or 2950 would not support Private VLAN setup, do I then just configure the secondary vlan to be allowed across the trunk from the 6500, configure that vlan on the Procurve or 2950 (as vtp will not foward the info for the secondary vlan) and assign that vlan to the host port as well as setting it as a protected port and this will communicate just fine across the trunk to the router as well as stopping the protected port in top of rack switch 1 from being able to communicate to a protected port in top of rack 2,3,etc? If the above scenario is what needs to be done, do I just use a regular trunk or do I have to use a PVLAN trunk?
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Apr 18, 2012
I am trying to test the gigabit ports on a Cisco 2950 switch. 1000Base-SX. I have the internet or dhcp server connected to port 24 on the first switch and my pc hooked up to the (any) port on the second switch. Both switchs are connected with a fiberoptic cable with MTRJ connectors on either side.
Now when I use gi0/2 on both switchs all works fine. I get a dhcp address from the router on the other end of the first switch. but when ever I include gi0/1 on either end of the fiber optic cable neither of the ports will initialize (neither of the leds above the ports light up). I have deleted all the config files before booting up the switchs so they should have a default blank configuration.
When looking at the Http web page for the switch I dont see any issues with the port. what can I do to make sure these ports are working or can be configured?
I will not be able to post back any more information about the switch until next tuesday. Im off till then.
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Mar 14, 2011
I have issue with 2950 switch dot1x config is not working , but on 2960 its working fine .Below are the configs from both switches and a debug dot1x all snap, what may be the issue with 2950 switch ...
on 2950======>
aaa new-modelaaa authentication dot1x default group radiusaaa authorization network default group radius
[Code].....
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Feb 23, 2013
I have network consists of more then 20 cisco 2950/2960/3700 switches. I have configured port security in my switches. initially when i configured on my switches it worked fine....even for copule of months it worked fine. but suddenly it start creating issues and now i am not able to implement port security on switches. the configuration is same but there is no effect now. Same switches were fine but now even having same configuration it is not working. please see the configuration: [code]
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Nov 7, 2011
At our office we use seven Cisco 300 Series Small Business Switches. One main switch in the server room and one in each room. They work great! But I’m having difficulties getting the Auto Voice VLAN to work correctly. In fact, it seems to works straight away on a PoE model, but not on the non-PoE models.
Switch (main server room):
Cisco SG 300-28 (PID:SRW2024-K9)-VSD
Switches (one in each room):
Cisco SG 300-10 (PID:SRW2008-K9)-VSDCisco SG 300-10 (PID:SRW2008-K9)-VSDCisco SG 300-10 (PID:SRW2008-K9)-VSDCisco SG 300-10 (PID:SRW2008-K9)-VSDCisco SG 300-10 (PID:SRW2008-K9)-VSDCisco SG 300-10P (PID:SRW2008P-K9)-VSD
All these switches use firmware v1.1.1.8. The switches in each room are connected to the central switch by Link Aggregation. The main switch is configured in Layer 3 mode and all the others in Layer 2 mode. We have a lot of VLAN’s configured. For this problem allow me to describe only the two that are relevant.
VLAN 102 - Internal Network (Clients)VLAN 104 - Internal Network (Voice) The switches on each room are mainly used for clients, printers and IP phones. The clients and printers should operate in VLAN 102. The IP phones should operate in VLAN 104. For this to work I have the 10 port switches configured as following.
GE1 – Trunk – 102U;104TGE2 – Trunk – 102U;104TGE3 – Trunk – 102U;104TGE4 – Trunk – 102U;104TGE5 – Trunk – 102U;104TGE6 – Trunk – 102U;104TGE7 – Trunk – 102U;104TGE8 – Trunk – 102U;104TGE9 – Trunk – 1P (LAG 1, with 1U;102T;104T)GE10 – Trunk – 1P (LAG 1, with 1U;102T;104T)
The network is fully routable. A DHCP Server is available. Each VLAN uses DHCP relaying. If we statically assign a VLAN to a port, that just works fine. Auto Voice VLAN is enabled with VLAN ID 104. All switches are configured the same. But this is what occurs…
When I connect an IP phone on the SG300-10P the IP phones are assigned to the Voice VLAN ID 104. If I would connect a desktop to that same port it is assigned to VLAN ID 102. Exactly as it should.But when I connect an IP phone on a SG300-10 the IP it is assigned to VLAN ID 102. But I also noticed that in some cases they are assigned to VLAN ID 1 and don’t get an IP Address. That depends in which order I change settings. The port its VLAN membership is then even changed to 1P. Although the port is recognized as an “IP Phone” by the smartport feature. I have noticed it does make difference if I modify the smartport macro and change the native_vlan paramater from "1" to "let's" say "102". That seems to affect it. Of course it may be just coincidence. What am I doing wrong? How should it work?How should you actually configure each port on a switch? (trunk?, Tagged/Untagged VLAN?)If you do not use Telephony OUI. Do you still need to configure the macros on the smartport defenitions?
I have tried about everything. I have also tried Telephony OUI, but it doesn't make any difference. I just can't get it to work properly on the non-PoE switch.
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Sep 11, 2012
recently i just connected a non cisco ip phone(from panasonic) to Cisco 2960 POE switch at site A. The PABX system is located at site B,Site A and site B are connected using MetroE Point to point.I would like to apply QoS for voice vlan. I want to assign 2MB to the point to point connection for voice vlan.
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May 12, 2011
We are trying to config vlan 10 for data and vlan 20 for voice on the same port - port 1 of swtich SF300-24P to run both data and voice on different vlans.Do I have to add vlan 10 as an untagged vlan to port 1 and add vlan 20 as an tagged vlan to port 1?If I do not want to assign the native vlan 1 to port 1, how can I remove it ? The GUI page - assign VLAN to port does not allow to remove it.Aslo, what mode shall I set up on port 1? General, trunk or access ?
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Feb 2, 2011
I have set up 2 DHCP pools and 2 VLANs (1 *the native* for data / 1 VLAN for voice). When I use the command "switchport voice vlan 20" the port disapear from the show vlan brief list. When I use the "switchport access vlan 20" it shows up in the show vlan brief in the correct VLAN and gives the phone an IP. I assume that using the access instead of the voice is wrong and the phones would not configure correctly. But when I use the access the phone goes to the next step and tells me the TFTP files are not found. Why does the port disapear from the VLAN list?
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Sep 5, 2012
Extended IP access list VLAN20
10 permit tcp any any established
11 permit icmp any any
20 permit tcp any 192.168.20.0 0.0.0.255 eq 80
30 permit tcp any 192.168.20.0 0.0.0.255 eq 443
40 deny ip any any log
[code].....
Above is the network diagram and access list for VLAN 20 and VLAN 30, applied on incoming direction of each valn.But still able to access other port which is not on access list, tried changing the direction with no luck.Inter vlan routing is enabled on CoreSwitch default router is 192.168.10.10
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Jun 3, 2012
We have two Cisco switches with one 3560 and one 3750 we have created a new Vlan 4 with IP 10.1.3.x 255.255.255.0 - no shut then assigne to gi 2/0/46 on the 3560 Vlan 4 ip address 10.1.3.x 255.255.255.0 no shut then assign to FA0/45. All interfaces are up up along with the Vlan up up, we can ping the local IP address bu not able to pint the other switch.
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Oct 25, 2011
We're looking at implementing a new phone system which will use voice over ip. Currently we have a mixture of Cisco 3750 and Cisco 3550 switches which don't support power over ethernet. Its been suggested we could continue using the current switches and power the new phones using power adapters.
Int terms of implementing qos (we don't have any at the moment) for the voice will a Cisco 3550 be OK and will having a mixture of different models using 3550 and 3750 pose any challenges with the qos policy for the voice. I believe there are differences in that the Cisco 3550 doesn't support srr-queues but having little experience with qos I'm not sure what impact this will have if any?
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Jan 10, 2012
I have a customer who has a Cisco 2821 router with software 2821/HSEC/K9 and they wish to upgrade to C2821-VSEC-SRST/K9.From my understanding they want to use the same router but install an IOS with the capabilites it has at the moment but with voice. [code]How do I go about pricing this up and what upgrade sku's will do this?I am not to worried about the memory.Is it just a simple ios upgrade as the srst licenses are on a trust basis?
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Oct 12, 2006
Had problems with voice quality on VoIP with 4500 series switches and the qos dbl feature (which gets enabled by the auto qos feature)?? I have had a couple of customer complaining about voice quality and our voice team spent a lot of time investigating; I had ruled out the network infrastructure because it was all QOS enabled. The voip people came up against a blank so I looked at the network once more and disbaled dbl with hope more than anything else. Mysteriously the voice quality issues the customer was having have now disappeared. Not sure whether a coincidence (though I have done this on two customers now) or something to with with dbl. There is nothing on this on cco.
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Jul 31, 2012
I have cisco2811 and HWIC-1CE1T1-PRI in the main office are using to connect 10 branches ( 10 ISDN lines) for Data.
I have available channels in the used E1 so I can use them for voice using PVDM2-64 ?
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Jan 4, 2012
Wireless Phone --> 881W router --> VPN --> ASA5510 --> LAN with CCM and Voice Gateway
Phone registers to CCM Internal calls work External calls connect but get no voice in either direction
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