Cisco Switching/Routing :: 2 PE Routers Connected To Each Other Via 2960S And 3750 Switches

Mar 5, 2013

I have 2 PE routers connected to each other via 2960S and 3750 (non-metro) switches:

[PE1] -- [2960S] -- [3750] -- [2960S] -- [PE2]

I will be sending voice and data traffic between the two and my voice traffic will be marked DSCP EF & EXP 5.

Since the 2960's and 3750's can't match on the EXP bits, I am wondering if the "mls qos trust dscp" command still works. Is the 2960/3750 able to match on DSCP even though there's an MPLS header on top of the IP packet?

I'd like to avoid having to tag my VLAN traffic on the PE and rely on COS to achieve QoS in this case.

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Cisco Switching/Routing :: Two 3750 L3 Switches Connected Via Trunk

Jan 29, 2012

I have client who has two distant offices with 3750 L3 as core (do all vlan routing for local office) and multiple L2 access switches with multiple VLAN’s connected to it. First 3750 is hub also connected to internet, second 3750 is spoke and acting as a router on stick. We have eigrp configured on both side ISP provided client 100Mbps link as a trunk with two vlan; vlan10 for voice and vlan20 for data. We assigned two small subnets to these vlans and Hub addresses are and respectively. How to force voice over VLAN10 and data via vlan20, but still do some load balancing? How to setup default route on second (router on stick) switch?

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Cisco Switching/Routing :: 3750 Receiving CDP Packets From Switches Not Directly Connected

Jun 27, 2010

A specific switch port which happens to be part of a 2 switch 3750 Switch Stack is seeing multiple CDP packets from 3 extra switch port interfaces that are not directly connected. Noteworthy is that the far end devices have the correct CDP entries and I physically confirmed at least two of those connections that lead to the switch "upstream to the culprit switch". Tricky part is that its production so room for maneuvering is limited. At some point I disabled all Ports save for the real uplink and the problem momentarily disappeared. Re-enable the interfaces problem resurfaces. Is there an explanation, technique to eliminate the culprit with minimal disruption?

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Cisco Switching/Routing :: 3750 - Two Switches Connected With Single Mode Cable

Jun 4, 2012

I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.

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Cisco Switching/Routing :: 4500E Not Remember MAC After Connected To 2960s

Jan 15, 2013

client originally connects to the 4500E, moves to the 2960s and then cannot connect back to the 4500E.My design is a 4500E (configured for routing) and a 2960s. The 2960s is trunked to the 4500E, no vlan pruning.

- shut/no shut port on the 4500E doesn't work

- no result for sh ip arp | i (clients mac) or sh mac address | i (clients mac) on the 4500E
The only way I can get the user back online is removing the 2960s, not a desirable solution as other clients are on the 2960s.

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Cisco Switching/Routing :: 2960S Stacks / 3750 - EtherChannel Group Numbers?

Jan 27, 2012

I have a 3750 as core switch, adding 2 stacks of 2960S to connect. I want to establish etherchannel between the 3750 and each additonal 2960S stack, do the channel group numbers between the 3750 and the new 2960s have to match? 3750 has two channel-groups(1 and 2) already configured. Need to know,  I would create 2 additional channel groups (number 3,4) for each of the etherchannels between the 3 2960S Stacks and 3750? OR channel-group # is local to the device.

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Cisco Switching/Routing :: Cannot Uplink - Daisy Chain 2960S Series Switch To 3750

Feb 5, 2012

I have a new Cisco 2960 S series switch with a basic configuration that needs to be uplinked or daisy chained to a Cisco 3750 switch. I am not getting any connectivity to the network with either a straight through or crossover cable. the port remains in amber but a 'show interface' indicates that the interface is up. I can manage the switch with a PC patched into any port on the switch with a static IP address. Must be something very simple that I am missing. Outlined below is the configuration.
Refresh_SW1#sh ver
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3,
Technical Support: [URL]


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Cisco Switching/Routing :: Stacking 2960S Switches Options?

Oct 10, 2012

I have 2  Catalyst 2960S (24 ports and 48 ports). Can I stack them using the Uplink connection instead of the stack modules. I know Stack module is the best option but it is kind of expensives (half price of the 24 ports switch) and I only need to stack no more then 2 switches.

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Cisco Switching/Routing :: To Use Flexstack To Stack Two 2960S 48 Port Switches

Oct 11, 2012

I would like to use flexstack to stack two Cisco 2960S 48 Port switches (2960S-48TD-L) for redundancy. Each switch will have a single 10G uplink into our Nexus 7K. One switch in the stack will terminate to linecard 6 (N7K-F248XP-25) and the other switch will terminate to linecard 7 (N7K-F248XP-25). My question is how many flexstack cables are needed? Do I need only one cable or do I need two to connect the two 2960s ?

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Cisco Switching/Routing :: Possible To Do LACP Using 2 X 10GB Between 3750X / 2960S Switches

Sep 4, 2012

I need to know if is possible to do a LACP using  2 x 10GB between 3750X and 2960S (WS-C2960S-48LPD-L) switches.

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Cisco Switching/Routing :: Adding 2960s To Existing Stack Of Two POE Switches

Feb 27, 2013

I have to add a 2960s PoE switch to an existing stack of two 2960s PoE switches. If The new switch has no configuration on it and the existing stack is broken by pulling te stack cables and then new cables are added and everything re-cabled correctly will the new switch assume the configuration from the stack without any issues?

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Cisco Switching/Routing :: 3750 Stackable Switches Etherchannel To Core Switches

Nov 18, 2011

If I have two stackable switches one switch uplinks to one 6509 core switch and the other connection uplinks to another 6509 core switch, and also the other stackable switch does not connect to the core switches. Because I am using hsrp and also we are not using vss then one uplink to the core is not in used only ones is so then how does creating an etherchannel between does two uplinks to both core switches benefit me in anyway such as more bandwith and using both uplinks at the same time or I'm I wrong?

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Cisco Switching/Routing :: 3750 Stackable Switches And 6509 Core Switches

Nov 14, 2011

If I have two stackable switches were only one stackable switch has two uplinks one uplink goes to one core 6509 switch and the other uplink goes to the other 6509 core switch can a Layer 3 etherchannel be used if each uplink go to a different core switch, by the way hsrp is running between both switches and also can you give an example how data will be routed from the stackable switch through the ethernetchannel to one of the core switch accross the WAN to another core switch?

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Cisco Switching/Routing :: 3750 Switch Connected Computers Hang For Few Minutes

May 6, 2013

In my customer having 3750 switch and they have simply assign IP address for vlan and enable telnet in switch and other things are same as default switch.In this switch they have connected 8 cisco layer 2 switches(6 managed and 2 unmanged switch) and approximately 5 servers connected in this switch.In a particular interval,users accessing File server are connected to 3750 switch become hanged for few min.This happen for some particular interval.users accessing this server becomes entirely hanged for few min,then i have configured port monitor cmd and i have installed one wildshark tool to host connected directly to that switch.

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Cisco Switching/Routing :: InterVlan Routing With 3750 And 2960 Switches?

Nov 21, 2012

I am using a 3750 as a default gateway for multiple Vlans on a few 2960 switches. The trunk lines are configured and working and I have assigned ip addresses to each of the Vlan interfaces on the 3750. My issue is that I can only ping the ip address on the Vlan interface of the 3750 if I have a working computer plugged directly into the Vlan on the 3750. I only have 3 vlans on the 3750 that have hosts directly connected (vlans 2, 10 and 40) the other vlans ( 20 and 70) don't have any clients plugged into them on the 3750 but the hosts reside on 2 different 2960s that connect via trunk ports. How do I keep the vlan interface on the 3750 switch pingable when I don't have hosts directly connected in that vlan on the 3750? (yes, I have enabled ip routing on the 3750)

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Cisco Switching/Routing :: Policy Based Routing With 3750 Switches

Oct 17, 2011

I have a simple design with 3750. I configured a route-map which define a next hop. I defined this route-map on a policy on a vlan interface.When I test some ping and a debug ip policy and it seems that my policy never match.Is there any mechanism that prevent the switch from using PBR? I think of CEF .

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Cisco Switching/Routing :: Policy Based Routing And 3750 Switches?

Sep 5, 2012

I have a simple design with 3750.I configured a route-map which define a next hop.I defined this route-map on a policy on a vlan interface.When I test some ping and a debug ip policy and it seems that my policy never match.Is there any mechanism that prevent the switch from using PBR?

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Cisco Switching/Routing :: 3750 Method Of Forcing Non Connected Switch Port LED To Blink

Jan 9, 2012

Any method of forcing a non connected switch port LED to blink for a certain number of times regardless if there is anything connected.The purpose of this is we have remote 3750 switch stacks and quite often have to tell non technical staff to patch to a certain port. It would be much easier if we could say "Connect it to the empty port which just started blinking orange" as the port numbers are difficult for them to see in these locations.A similar feature is available in the ethtool package for linux which makes it really easy for identifying ports on servers. It would be great if a similar feature is available on Cisco switches.

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Cisco Switching/Routing :: 3750 - Port VLAN Setting Reverts Whenever Host Connected

Apr 17, 2013

One of the ports on the 3750 stack was configured for VLAN121. It was changed to VLAN40 and the configuration saved. Both VLANs exist in the switch configuration. As soon as a host was connected (in this case, a label printer) the port VLAN reverted back to VLAN121.

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Cisco Switching/Routing :: Portchannel Between 3750 Switches

Feb 20, 2013

Switch A connects to Swich B and C using port channel. I am going to bring down one link on each.
switch A is server farm , switch B and C are core 01 and 02 . and all are 3750 switches.
1. what will be the impact on the network in terms of spanning tree recalculation
2. what duration are we talking about until the spanning tree convergence happens?
3.I plan to shut down the link from CLI to bring down the links

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Cisco Switching/Routing :: L3 Routing On 3750 Switches?

Jan 21, 2013

I have a small campus network using 3750 stackable switches  and a 3725 router (see diagram below). Currently the 3725 router is handling inter-vlan routing for the campus and it looks like it's not able to handle the amount of traffic we're pushing. The router CPU sometimes hits above 90% due traffic load. What I would like to accomplish is move L3 process over to the 3750 MDF stack and the IDF1 stack. I am thinking creating SVI's on both MDF stack and IDF1 stack, run HSRP between the two stacks and may be do load balance traffic between the two stack as well.

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Cisco Switching/Routing :: 3750 - Running 7 To 9 Switches In One Stack

Aug 6, 2012

Looking for feedback from other organizations that have large 3750 stacks.  I've got one stack of (8) 3750's composed of (6) 3750G's and (2) plain 3750's.  This particular stack is usually unresponsive to SNMP queries and often fails to write config when we make changes.  After a couple tries it will finally go.  Part of my probably here is likely the plain 3750's that always boot faster and come up as the master.  I should manually set the master to one of the G's.  What I'm wondering is who else has 7-9 3750's stacked and are they performing well for SNMP, telnet, etc?  I've got another newer stack of 7 3750E's that I need to add one more switch to.  Need to decide if I want extended downtime to break the stack up or just add the 3750X to make member 8 and hope it performs well.  I have 50+ 3750 stacks working great on our campus.

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Cisco Switching/Routing :: QoS / Queue Drops On 3750 Switches?

Apr 30, 2013

We currently have a  site with a very simple topology that uses a 3750X switch stack for a  collapsed core. Everyday, the users have a conference call and  experience poor voice quality.Its not bad when users call from several  conference phones, but when everyone calls in on individual phones,  there is choppy and almost inaudible voice quality experienced. The  voice traffic flow would be as follows: Phone <-> 3750 switch  <-> Voice GW We  have packet captures showing that RTP packet loss is occuring from the  phone to the voice gateway, but none from the voice gateway to the  phones. We also have drops in the output queues that match drops on the  asics. I can reset the counters and they will be clear until the call,  and then they increment significantly during the call. The voice gateway  and phones are non-Cisco. The switch stack has 6 switches. We are trusting the DSCP settings on the  phones. All the queue drops from the phones are usually in queues 0-3,  but all drops on the voice gateway is in queue 0. Below are the QoS  settings; they are mostly default and we have not changed any queuing,  thresholds, or buffers. Should we specify larger buffers and threshold  for a designated queue and send EF traffic to that queue?
MySwitch#sh mls qos
QoS is enabled
QoS ip packet dscp rewrite is disabled
 Typical Port
trust state: trust dscp


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Cisco Switching/Routing :: Connecting 3750 And 3650 Switches Together

Sep 16, 2012

I have a small network using a 24 port 3750 switch.  I need to add five computers in another room and only have one Cat 6 cable running there and no room left on the 3750.  I got a 3650 to put in the new room with the new computers.  The problem is, whenever I plug the new switch into the 3750, it shuts down the port and gives me an err-disable.  I can do a shut/no shut and re-enable the port.  I searched the web and read about trunking and clusters.  I'm not sure which, if either, is appropriate.  I see various documentation that shows you can put one switch behind the other.  But nothing tells me the configuration which will allow it.

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Cisco Switching/Routing :: 3750 Stackable Switches Uplink

Nov 14, 2011

If I have two stackable switches one that connects to the 6509 core switch and the other switch does not, do I have to uplink the switch to the other switch so that switch has route to the core switch or because the switches are daisy chain there is not need to cable one switch to to the other switch connected to core switch?

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Cisco Switching/Routing :: DHCP Limitation On 3750 Switches?

Jul 16, 2012

I want to clear following things regarding Cisco 3750 switch.

1. Can I configure Multiple DHCP pool on C3750?

2. Performance effect due to same?

3. Can I resrve IP addrese from DHCP pool for specific MAC address.

4. Can I Exempt IP address from DHCP pool ?

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Cisco Switching/Routing :: 3750 Stack Switches IOS Upgrade?

Nov 13, 2012

I am trying to do ios upgrade on 5 stacked 3750 switches. All the switches have different model number, so i am wondering which image file i should download. As far as i understand all the stacked switches should have the same IOS, i may be wrong. The switches have the following model numbers and SW images;
Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
     1   28     WS-C3750G-24PS     12.2(35)SE5             C3750-IPSERVICESK9-M
*    2   28     WS-C3750G-24PS     12.2(35)SE5             C3750-IPSERVICESK9-M
     3   52     WS-C3750G-48PS     12.2(35)SE5             C3750-IPSERVICESK9-M
     4   30     WS-C3750E-24PD     12.2(35)SE5             C3750E-UNIVERSAL-M
     5   30     WS-C3750E-24PD     12.2(35)SE5             C3750E-UNIVERSAL-M
which image file i should use as they all have different model numbers and Cisco provides different image files for each model.

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Cisco Switching/Routing :: SFP-10G-ER Is Not Supported On Catalyst 3750-X And On Other Switches

Sep 23, 2010

SFP-10G-ER are not supported on Catalyst 3750-X and on other switches ....
%PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi1/1/1 is not supported
Why ?When will ER be supported ?

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Cisco Switching/Routing :: 3750 Connecting Server With 2 NIC To Different Switches

Nov 14, 2011

Server with Two NIC teamed using HP teaming tool. NIC#1 connects to SW1 and NIC#2 connects to SW2
SW1--------------------NIC_1 (SERVER) NIC_2--------------------SW2
Will the config be access-port on Sw1 & Sw2 connecting to Server.Sw1 & Sw2 are connecting to 3750 as trunk ports

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Cisco Switching/Routing :: 3750 Stack Switches Not Showing Up

Jan 27, 2013

We have several stacks of 3750 switches where this problem is occurring.  All of the switches are running IOS version 12.2(50)SE3.  (Yes, I know it's old.)
We're seeing inconsistency in how the stack reports members when issuing the following commands:
sow switch
show version
show inventory
Not all members are showing up in the output of the "show version" and "show inventory" commands.  For example:
HUNTI-WV-WDAC03#sh switch
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
1       Member 108c.cff2.ea00     15     0       Ready              
2       Member 8cb6.4f0a.a600     1      0       Ready              
*3       Master 8cb6.4f0a.9c00     1      0       Ready
(all three switches in stack are displayed)(code)

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Cisco Switching/Routing :: 3750 - Enable SNMP On Switches?

Dec 26, 2011

I want to enable SNMP and track the status/ of the interfaces in switches.
We have Two- cat 3750 (L3 switch)  and Nine-cat 2960 (L2)
How to configure the SNMP. any Links provides the required info with an example of configuring snmp will be really useful.
we have OPEN NMS, SPLUNK, MYSQL monitoring tools.

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Cisco Switching/Routing :: Auto-QoS On Catalyst 3750 LAN Switches?

Aug 12, 2012

why the AutoQoS macro does not implement "priority-queue out" when configured on the 3750 platform running certain versions of software. The only other platform I have experience with AutoQos is on the 4500 and it enables priority queuing as expected. So what's up with autoqos on the 3750 on version 12.2(35)SE5?
When it comes to configuring QoS on campus user/phone access ports there are some important settings that can and should be considered but one can argue that enabling the priority queue is the single most impactful or important command. So I was very surprised and concerned when I didn't see priority-queue out. Cisco describes AutoQoS as a simple, quick way of deploying QoS on the LAN and it precludes you from having to learn all of the differences between hardware platforms. But is it true that this tool produces an incomplete config solution? Let me know if I am missing something.
Here is an example of what AutoQoS produces when applied to a 4507 with WS-X4648-RJ45V+E:(other interface commands are left out for simplicity)
interface GigabitEthernet5/25description XYZ
switchport mode accessauto qos voip cisco-phoneqos trust device cisco-phoneservice-policy input AutoQos-VoIP-Input-Cos-Policyservice-policy output AutoQos-VoIP-Output-Policy
 policy-map AutoQos-VoIP-Output-Policy
class AutoQos-VoIP-Bearer-QosGroup
set dscp ef

Here is an example of what AutoQoS produces when applied to a 3750 running version 12.2.(35)SE5: (no priority-queue out)
interface GigabitEthernet1/0/36
switchport access vlan 8
switchport mode access
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0


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Cisco Switching/Routing :: 3750 - Etherchannel Across 2 L3 Switches To Stack

Mar 26, 2012

I am wanting to etherchannel from a 3750 stack to core Layer 3 switches (also 3750) with a cable going to each core switch, I have put both core switches and the stack under a 28bit subnet mask, but I dont seem to be load balancing across both links.

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