Cisco Switching/Routing :: 2960S QoS For VoIP?

Mar 25, 2012

I read some papers about QoS. The thing is that I have to implement 30 switches with QoS to connect to a lot of Cisco IP phones. The switches are Cisco 2960S with code image "C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3". Should I use autoQoS feature or manually configure them?. How should I treat uplinks between access switchs and core/distribution? I have a lot of doubts regarding queueing, because all the info I had read its for another model/image.

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Cisco :: Adding 2960S Switch To Network And Voip?

Apr 16, 2012

I have 6 cisco switches already on my network and I just got a 2960S PoE switch that I need to enable for VoIP. The voice vendor is coming in to setup our phone system for VoIP and I need to enable this new 2960S 48 port switch for the VoIP phones, I don't know how to do that, or other taskes needed for this project.

I was told that I need to uplink the new 2960S with the Catalysy 4507R using an ethernet cable and to "trunk the ports" and enable the 2960S as a VTP client - ok great - how?

I was told I also need to use the switch port voice VLAN command for the new VLAN - again, great - but how?

I actually was able to telnet into the switch and I gave it an IP and I created a new vlan but thats all. We are using non Cisco IP phones.

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Cisco Switching/Routing :: Why Does Routing Work Without Declaring Vlan10 On 2960s-24td-l

Oct 28, 2012

I have recently split the voice vlan (10) from the data network (1), and am wondering why my catalysts and router do not require an interface Vlan10 statement.  In the past I used OpenBSD boxes to do the routing, and I first needed to configure vlan 10 on the interface before I could get inter-vlan communication to work.  With these Cisco devices it works, and I am wondering if it is because of VTP, for the fact that the ports maybe just pass all traffic, or is there some other explanation?  Below is the setup, and firmware is up-to-date on all of the devices.
When I plug a phone into the POE SGE, the phone turns on, obtains an address on the proper subnet, and conversations are clear (whereas without the ip nat inside on the new subnet the calls had a lot of static).  Possibly the reason that it works is because the phones properly create the tcp/ip packet, and it hops over the trunks and creates the states so that traffic routes back properly.  I will install wireshark to see exactly what is going on, but is there a simple explanation that I am overlooking?

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Cisco Switching/Routing :: 2960 / SG 300 Switch - VoIP Setup - Asymmetric Routing Not Working

May 21, 2013

I have a Cisco SG 300-20 as the core switch, layer 3. It is on VLAN1 and for VLAN2 (VOIP). All the ports are set in trunk mode. DHCP relay is setup on this switch.
The phones connected into a layer 2, Catalyst 2960-S switch. All ports are set in trunk mode. Default gateway on it is set to
DHCP for both VLANs is provided by a Windows Server 2008 R2 server (the relay IP
There is also an ASA 5510 in the mix which is It has a route added to it for the network to go to the SG 300 (
Just the two switches can ping each other on the 192.168.5.x network when I "add vlan 2" to the trunk port that is connected between the SG 300 and the 2960. The phones don't get DHCP on the 2960 switch. And I cannot ping 192.168.5.x from the ASA or anything else on the 192.168.4.x network.
After a bit of reading on intra-vlan routing for the SG 300 switch, I am thinking the SG 300 has to be the "center" of things so I need to make it to be the gateway for both VLANs and change the ASA to for VLAN1, etc. And I really can't do asymmetric routing with this switch.

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Cisco Switching/Routing :: How To Enable Multicast Routing On 2960s

Mar 23, 2013

I need to enable multicast routing on 2960s but the command "ip multicast-routing" isn't available on my release (12.2.(55)).
From which release this command is available?     

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Cisco Switching/Routing :: 2960S And MLS QoS Map

Oct 8, 2012

I have C2960S-48FPS-L and C2960S-24TS-S both of them are using C2960S-UNVERSALK9-M image with version 15.0(2)SE on both I run "mls qos"
and on 48FPS-L I run "mls qos map cos-dscp..."on 24TS-S I cannot run it. there is no such command. there is just "mls qos rewrite..." and "mls qos srr-queue..." variants. 
I thought that one image give the same set of commands...?

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Cisco Switching/Routing :: 2960S Multicast Routing

Jan 17, 2012

while i am configuring a port on switch .The switch reloads.After reload the show version says,System returned to ROM by bus error at PC 0x458F6C, address 0x0,show version from the effected switch is,Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1).

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Cisco Switching/Routing :: STP Between 2960S And SG300

Dec 8, 2011

I am currently having an issue with connecting a Catalyst 2960-S switch to a Small Business SG300 switch. When I connect them they are unable to form a link. When I do a show spanning-tree it says the mst link is in dispute.

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Cisco Switching/Routing :: Mix 10G And 1G Uplinks On 2960s?

May 16, 2013

I'm looking at the WS-C2960S-48TD-L and have a question about the uplink ports. Is it possible to mix 10G on one uplink and 1G on the other?  The datasheet says 2x10G SFP+, 2x1G SFP so I am thinking mixing is not possible.

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Cisco Switching/Routing :: How To Use USB Option On 2960s

Nov 5, 2011

just got new hardware and decided to try the newer USB port for IOS upgrades. I could not get the switch to recognize my 2gig flash drive. Do I need a proprietary stick or special format?

I also noticed when I removed it the switches crash dump and rebooted?

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Cisco Switching/Routing :: VOIP QOS Configuration SGE 2010

Dec 10, 2012

I'm looking to do a basic QOS configuration which states that VOIP traffic has priority over anything else.

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Cisco Switching/Routing :: Can RPS2300 Support 2960S

Aug 18, 2012

When using dynamic configuration tools, if I choose 2960 (not 2960s), I have the option to choose RPS2300 as redundant power, but when I choose 2960s, I cannot choose RPS2300. However, in a document describe both 2960 and 2960s, it said that RPS2300 can be used. Does RPS2300 support 2960S?

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Cisco Switching/Routing :: Setting Voip On 3825?

Dec 16, 2012

configure, or enable voice over ip (voip) on my router cisco 3825, I have Ip phone 7905G and 7960.

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Cisco Switching/Routing :: 2960S QoS Configuration Not Work

Dec 20, 2012

Recently I'm working with my client to setup their network and he want me to limit user access internet bandwidth to 2 Mbps and the topology show below.Users ---> Switch ---> NAT Router ---> (int gi1/0/24 - qos apply)  Edge Switch ---> INTERNET ROUTER (12Mbps) --->> INTERNET,This is my configuration, but it doesn't work, the end user still able to get more than 2Mbps internet speed.Access-list 100 permit ip any any dscp default,class-map match-all QoS_Floor_Limit, match access-group 100.

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Cisco Switching/Routing :: QoS Configuration For VoIP Sg300

Jun 20, 2012

try to configure QoS on a Cisco Small Business SG300 Switch. I followed the instruction on [URL] and configured one Port for tagging my Traffic from a Aastra IP Phone. Tagging works fine (i verified with wireshark).The problem is, that all traffic to a PC connected directly to the Aastra IP Phone is blocked. Is there a possibility to tag any other traffic to the port as a default?

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Cisco Switching/Routing :: Implementing Voip On 3825?

Dec 16, 2012

implement VOIP on my router 3825 I have Ip phone 7905G and 7960.

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Cisco Switching/Routing :: Stack 4900M With 2960S?

Mar 11, 2013

I would like if is possible to stack a Cisco 4900M with a 2960S. I know it is not the most common situation but i need it.

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Cisco Switching/Routing :: 2960S MAC Address Control

Feb 20, 2013

I would like to enable port security to hardcode the MAC address on the ethernet switch. There are 5 ethernet ports in the same ethernet switch to be assigned for one person (one note book), e.g. port 5, 6, 15, 16 and 23. The model of ethernet switch is cisco 2960S and one MAC address is configured on 2960S.
1. Does 2960S support this requirement to allow input the same MAC address to 5 different port?

2. If yes, can ethernet switch "smart" enough to forward the packages to "active" ethernet port which is connected to notebook and the rest of four ports are inactive.

3. if no, any solution or any work around to achieve this requirement 

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Cisco Switching/Routing :: QoS On 3750x For VOIP Implementation?

May 23, 2013

We are going to be expanding our Shoretel phone system in our HQ and I need to get QoS configured correctly.  All of our offices are connected via MPLS and I need to make sure that we are sending QoS tagged traffic to our provider.  The phones are tagged by the director, but there is other traffic for call control that needs to be tagged.  I don't have access to our CPE router as it is managed by Sprint.  The Sprint router is connected to our internal network.  We have our data network running on (4) 3750x switches running 12.2(55) with IP feature set.  

The problem is that many of these commands don't work on the 3750 (priority, bandwidth, match protocol, etc...) and the configuration assumes you are applying this to an outbound queue which is not supported on the 3750.  I think I have to do this with policing, but I'm not sure what interfaces need to have this applied.  

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Cisco Switching/Routing :: 2960S / LAN Design Using 10G EtherChannels?

May 11, 2011

We are designing a LAN Network for ourselves.The proposed design is as follows:
4 x 2960S switches in a Stack   Access-Stack-I 4 x 2960S-PoE switches in a second Stack Access-Stack-II
2 x 3750X switches in a Stack   Core-Stack
Now I would like to connect it in the following manner ?First,I would like to use EtherChannel using the 10Gig LinksSecondly, I would like to use Cross-Stack EtherChanel too.I have given a graphical illustration of the connectivity Now my Qs: a) Will the 2960S supports EtherChannel using the 10G links and the 3750X too... b) Does the proposed solution will work... or It will have any problems.

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Cisco Switching/Routing :: SG300 Configure QoS For VOIP?

Mar 13, 2012

I'm looking to configure the QOS for VOIP on my network.I have a switch SG300 and several no Cisco VOIP phone. What are the parameters to be taken to implement the QOS?
What is the procedure for installing the QOS? I need to create a VLAN for the data and one for VOIP?I read in the quick start guide  that there is auto-QOS for VOIP?This can be done from the GUI? what are the options to put?

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Cisco Switching/Routing :: 2960S Cannot See VLAN100 Traffic On SW1

Jan 29, 2013

I have two switches (2960S's) both with IP Phones on VLAN100..We need to monitor voice traffic via a monitor port on SW1 of all VLAN100 traffic on both switches.The following is what we have configured, but we cannot see VLAN100 traffic on SW1
According to Cisco doco you cannot have a SPAN and RSPAN on the same session, however since these are two sessions on SW1, I would have thought it to be OK.

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Cisco Switching/Routing :: 2960s / Add One More Switch In Stack?

Apr 29, 2013

I have a running setup having 2 Cisco 2960s 24 TS switch with Stack configuration. Now I want to add one more same Cisco switch. My questions are:-
1) How can I do this...(Should follow the same process as I did before.

2) Could I do this without impacting the service. i.e. without rebooting the switch.

3) What should be the connection archiecture as of now since there is two switch so it is connected 1 -1 and 2-2. but for 3 switch should we require to change the connectivity.

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Cisco Switching/Routing :: Dscp Marking In 2960S

Jul 21, 2012

i did on cisco 2960S switch at user ingress interface. but the marking is not showing in show policy-map interface gig 1/0/10 interface and ACL is not showing any match.
I also had a config reference from 2960S cisco guide.
access-list 103 permit tcp any any eq 80
access-list 104 permit tcp any any eq 23
access-list 105 permit icmp host any
class-map IN_HTTP
match access-group 103

class-map IN_TELNET
match access-group 104(code)

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Cisco Switching/Routing :: High CPU Utilization On 2960S?

Feb 8, 2011

We have seen high CPU utilization on some Cisco switches of type 2960S. Also we got info, that applications are running with poor performance or with interruption.Following IOS is loaded: C2960s-universalk9-mz.122.55.SE

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Cisco Switching/Routing :: Dynamic Bandwidth On A 2960S?

Dec 20, 2012

They have a /28 wan adress coming from ISP, that gives out 100Mbps, going to a Cisco 2960S switch (ver. 12.2) the switch is only holding 1 vlan. Connected to the 2960 are 3 firewalls/routers from other manifactors, each creating their own network. The customer wishes for a solution where each final FW/router gets minimum 33% and maximum 100% of the bandwidth, depending on how much each final Fw/router are in use.

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Cisco Switching/Routing :: Stack 4900M With 2960S?

Mar 11, 2013

I would like to know if i can and how stack a Cisco 4900M with a 2960S. I know it's not the most common but i need it.

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Cisco Switching/Routing :: Information About PoE Of Switch 2960S

Jan 21, 2013

I use the Switch 2960S support PoE and 10 access points cisco.I have one more question:
-- If all 10 access points cisco use copper cable to connect to 2960S, 5 access points use power adapter and 5 access points use power from Switch. How Switch 2960S will provide power for 10 AP or switch 2960S will understand and only provide power for 5 APs?

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Cisco Switching/Routing :: Stack 2960s Not Full

May 7, 2013

I have 4 switchs 2960s in stack, but this not full ring. [code]the interface stack 1 for switch 1 is down and interface stack 2 for switch 4 is down.I do  insert this command "switch 1 stack port 1 enabled" but interface are not up.

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Cisco Switching/Routing :: IOS Upgrade Option In 2960S Switch

Dec 11, 2012

We  have a Cat2960-S Series PoE+ currently running 12.2(55) SE5 ios with SW image C2960S-UNIVERSALK9-M.We want to upgrade the ios to the lastest version but found there are 2 version: 12.2(53) SE2 and 15.0(1) SE.Which is the best & suitable for upgrade?

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Cisco Switching/Routing :: SFP-H10GB-CU3M Not Working In 2960S

Feb 15, 2013

We have a 2960S using a single SFP-10GBase-SR to our Core switch. We are planning connecting the 2960S to a pair of Nexus 5k switches using Copper SFPs. We are already doing this on another 2960S so I didn't expect any surprises.
When I removed the unused SFP-10GBase-SR from te1/0/2, the interface was removed from the config and a gi1/0/50 was created in its place. Once I inserted the SFP-H10GB-CU3M, I expected that it would create a new te1/0/2 interface, but it didn't. I got the following errors: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port Gi1/0/50 has bad crc %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/50, putting Gi1/0/50 in err-disable state
I didn't personally order the cables, but there is no Cisco label on them, so I'm assuming it is a 3rd party SFP. After looking at other posts related to unsupported SFPs, I ran the following commands: no errdisable detect cause gbic-invalid service unsupported-transceiver
After reconnecting the SFP, it didn't go into err-disable, but I still received the following error: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port Gi1/0/50 has bad crc
My other working 2960S appears to be using 3rd party SFP as well, but I can't see the brand. Is there anything else worth trying or should I just suck it up and order Cisco SFPs?

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Cisco Switching/Routing :: Catalyst 2960S IOS 15.0.2 IPv6 Don't Work

Aug 8, 2012

Just I have upgraded some 2960S to IOS 15.0(2)SE from a IOS 15.0(1)SE3 and the catalyst don't switch any IPv6 traffic. Don't work any RA and also don't work any unicast IPv6 traffic from any interface. I can see some references to IPv6 changes in the FHS (First Hop Security) in the Release Notes, but no any reference to changes in the configuration.
The switches don't have any IPv6 specific configuration and the sdm is the default templata. Returning to 15.0(1)SE3 everything work ok.
On Catalyst 2960, and 3560E this IOS version seem to work fine with IPv6.

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Cisco Switching/Routing :: SC/LC Cable Between 2960S Stack And 4948

Aug 9, 2012

I'm connecting the two devices above and I need an LC to SC fiber cable. It should be pretty simple but I've seen two different types of LC/SC cables - one is 8.3/125 and one is 62.5/125. I believe the 62.5 is an older cable type but when looking at the detail sheets for each of the SFPs I see that both of these support a 62.5 or 50 micron core size.

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