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 :: Single Mode Fiber Support For WS-3750 Switches?

Mar 5, 2012

I'm looking for switches that support single mode fiber connections and would like to know if "WS-C3750-FS-S Catalyst 3750 24 100BaseFX + 2 SFP" and "WS-C3750G-12S-S Catalyst 3750 12 SFP" can serve the purpose?

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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 :: 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 :: 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 Routing :: 3750x - Installing Single Mode Fiber / Switches Not Connecting?

Oct 22, 2011

Prior we only had 62.5u multi mode.I've got 3750x switches and new SM SFP and yellow fiber patch cables.  None of my links show connected.  No lights and trunk port interfaces show down/down.
Is there a special command you have to do on a port when using SM fiber?  Do you think I need cross over fibers?

Also, should I be able to see a laser signal light like MM or is SM a different frequency so it's not as visible as MM?

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Cisco Switching/Routing :: 1310NM / SFP-10G-LRM Over Single Mode Fiber?

May 23, 2012

Using SFP-10G-LRM with single mode fiber?  We have 1310nm.

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Cisco Switches :: SG200-18 Switches With LC Single Mode Fiber SFP's

Dec 2, 2012

We have a project in which we are using 34 Cisco SG200-18's each with a MGBLX1 (LC Single Mode Fiber) SFP mini-GBIC.All the fiber's come back to one building where we must "bridge" all 34 fiber connections. What hardware should be used to accomplish this? A L2 switch? For example, a 12 port SFP Switch with Fiber SFP's accepting the first 12 fiber connections, then other switch with SFP for the next 12 and so on, until there is a overall capacity of 36 and having patch cables between the 3 switches?
what cisco or non cisco hardware would work with these SF200-18's to accomplish this?

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Cisco Switching/Routing :: Does WS-C3750-12S Support Both Single And Multi-mode

Oct 11, 2012

I have a new building to add to our campus and I have been encouraged to run single mode fiber. All of my other buildings are connected with multi-mode fiber. I just want to make sure i will not have an issue if I run single mode to the new building with SM SFP's.

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Cisco Switching/Routing :: WS-X4306 What GBIC Is For Fiber Single Or Multi Mode

Jul 18, 2012

The module  WS-X4306, support  fibber fiber single mode ó fiber multi mode? what GBIC is for fiber single mode or fiber multi mode?

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Cisco Switching/Routing :: 3750X / 6509 - Trunking Over Single Mode Fiber

Oct 26, 2011

I'm having a problem with some new gear and can't seem to figure it out.  I have a 3750X-48P-S with a C3KX-10G-NM using SFP-10G-LR transceivers and I'm trying to trunk that with a 6509 that has a X2-10G-LR transceiver over single mode fiber.  This is not working.  Cisco TAC says the SFP+'s that we just got brand new are both bad and we need to order new ones.  I find that hard to believe but who knows.
The switch recognized the module and I tested all 4 ports in gigabit mode using GLC-SX-MM transceivers, all worked great.  I have the SFP+'s in tengig1/1/1 and 1/1/2 as they should be.  There are no other SFP's in the module either.
When I do a sho int tengig1/1/1 and 1/1/2 the media type doesn't show the transceiver that is installed like it does for the GLC-SX-MM ones.  Maybe it's not supposed to or maybe it just doesn't recognize them and it's a hardware issue.

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Cisco Switching/Routing :: ME3800 - Find SFP Transceiver / Single Mode That Operates At 100Mbp

Oct 4, 2012

I am struggling to find an SFP transceiver, single mode, that operates at 100Mbps in a 1000Mbps port in an ME3600 or ME3800.

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Cisco Switching/Routing :: Extending VPC Vlans Across Single Connected (into 7K) L2 Path?

Feb 19, 2012

Nexus infrastructure is pair of N7K switches, with dual homed 5K/2K devices connected, links use vPC. They want to extend vlan's from the 5K/2K side across a L2 path into another DC, this path is only connected into one of the N7K switches, call this 7K switch A.I'm concerned that packets from the 5K/2K side back to the remote DC could get dropped due to the vPC loop dectection process. If a packet from the 5K/2K side traverses the path into the same N7K (7K switch A) as the L2 extension, I dont see a problem. But, if the etherchannel load balance in the 5K sends traffic to the packet to N7K B, in order to get to the L2 path extension to the remote DC the packet gets forwarded across the vPC. My understanding is that this packet will get dropped by N7K A as its local L2 path to the remote DC is up, is this the case?I see a solution is to plug the L2 path into a 2K, but before I suggest this is my understanding of the loop detection process correct?

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Cisco Switching/Routing :: 3750 - Configuring Multiple VLANs For Single Port

Apr 11, 2012

I would like to configure a 3750 switch port to be able to use two vlans. I know you can do this with a voice and data vlan, but what about two data vlans ? Say I have two devices, one on a 10 subnet and the other on a 172 subnet, but i only have one wall jack for both devices to plug into. So I use a mini switch to connect both devices and connect the switch to the wall jack; and of course this all leads back to one switch port. When I go to enter the switchport access vlan 172 cmd, how would I also make it so the device on the 10 subnet could route out ?

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Cisco Switching/Routing :: WS-C3750-24FS-S 100baseFX Ports Will Not Work Over Single Mode Fiber

Feb 8, 2012

We've just purchased a WS-C3750-24FS-S, only to find that the 100baseFX ports will not work over Single Mode fibre, backhaul links. Any way or a device that convert from MM to SM?

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Cisco Switching/Routing :: 3945 - Connecting To 100M Single Mode Fiber Link SC To LC Conversion

Aug 4, 2012

connecting a Cisco 3945 Router to an Ethernet WAN Link. The service provider has provided a 100M Ethernet Single Mode Fiber handoff to the customer premises with SC Connector. The CPE configuration proposed for this setup is like this. [code]
Since the SFP has LC Connector, i suppose i need to have an SC-LC Cable for connecting the Ethernet link. Do i need anything else, apart from above?

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Cisco WAN :: 3750 - Use Two Core Switch 6500 With Single Mode Fiber As Transport Equipment?

Nov 30, 2012

I have a requirement to connect two 3750 switch with 10G speed between two sites with 150km distance. We will lay-out our own fiber (48 core) between two sites. I just want to consult the following:
1. Could i use two core switch 6500 with single mode fiber as a transport equipment?

2. Or i need to use SDH equipment because of the distance concern? If so do i need a repeater?Could i use Cisco Metro Core ONS, which one?

3. Any other option to achieve this requirement?

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Cisco Switching/Routing :: 3750 - Multiple Subnets In Single DHCP Pool On Device

Mar 25, 2012

3750 can not support multiple subnets in it's DHCP server pool config.

Is this an issue that can be fixed with a different iOS or is there a different Cisco switch that I can replace the 3750 with that will handle multiple subnets within an individual pool?

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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 Switches :: Single Mode Fiber Link Between SGE2000P And Catalyst 2960?

Jun 4, 2013

I'm working with a customer who has an SGE2000P and a Catalyst 2960 to setup and configure a single mode fiber link.  The SGE2000P has an MFELX1 fiber GBIC and the 2960 has a GLC-LH-SMD GBIC.  When I have the customer plug in his fiber, there is a power light that comes on on the MFELX1 GBIC. Neither GBICs/switches show that a link or activity is occurring, but the presence of that light makes me think that they are connecting somehow. Are these two switches/GBICs compatible?

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Cisco Switching/Routing :: 3750 - ASA Multiple Context Mode

Nov 16, 2011

Im looking for some clarification regarding running a Cisco ASA in transparent mode with multiple contexts.  To give you an insight into the network design we have the following -
Collapsed Core/Aggregation Layer running Cisco 3750s.  The 2 Cisco 3750s are using SVIs with HSRP for default gateways per customer with a total of 8 customers.  Each customer is segregated into seperate VLANs with Cisco 2960 switches used in the Access layer.  Each customer has 2 Cisco 2960 switches with redundant uplinks to the Core/Aggregation layer.  Customers are spanning tree loadbalanced between core/aggregation switches.
What i need to now do is add two transparent firewalls into the mix in either an active/active or active/standby setup.  I need the firewalls to support all 8 customers,  therefore I am guessing they need to run in multiple context mode.  Having read into this it has left me somewhat confused as to how to integrate them into the above setup as a bump in the wire so to speak. 

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Cisco Switching/Routing :: ASA-5525 - Connecting Multiple Switches To Single Firewall?

May 28, 2012

Could I configure and connect 3 Dell switches to an ASA-5525 Firewall which has got 8 interfaces.

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Cisco Switching/Routing :: WS-C3750X-12S-S Options To Achieve Putting All 4 Switches Into Single Stack

Feb 12, 2012

I have a couple of WS-C3750X-48T-L and a couple of WS-C3750X-12S-S, I want to stack all four of them together into a single stack. WS- C3750X-12S-S are running c3750e-universalk9-mz.122-58.SE2 whereas WS-C3750X-48T-L are running c3750e-universalk9-mz.122-55.SE3.I have got a couple of queries as under:What are the options to achieve putting all these 4 switches into a single stack? Can the LAN Base switches upgraded to IP Base?

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Cisco Switching/Routing :: 3750 - Transition From Multicast Dense To Sparse Mode

Jun 19, 2012

A multisite network is currently supporting muticast using PIM dense mode, which is enabled on router/switch LAN and WAN interfaces across all locations. I am about to introduce Nexus switches to the main LAN. How can I make dense and sparse mode coexist to ensure flow of muticast traffic between devices supporting and dense and sparse mode? Eventually, I want to transition  to the sparse mode; however, it has to be done gradually, even within a single site. The leacy equipment includes Cat 3750 and  4500s.

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Cisco Switching/Routing :: Duplex Mode On HSRP Routed Port On 3750

Nov 15, 2012

What should the duplex mode to be set on a routed port gi0/21 that are running HSRP ? I try setting the gi0/21 to full, but it caused the port to be down. The only way for the port to be up is setting it to half duplex.
Cisco 3750 Switch
interface GigabitEthernet0/21
no switchport
ip address


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Cisco Switching/Routing :: 3750 - 24TS / PAgP Port In Stand-alone Mode

Mar 23, 2013

Devices are 3750-24TS Switches, software version is 12.2(55)SE6. how to troubleshoot this issue, I have a pair of ports which are not bundling, no matter what. Is the same behavior with LACP or PAgP. In this outputs I have only the PAgP case.
Output is similar to:

Group  Port-channel  Protocol    Ports
12     Po12(SD)        PAgP      Fa1/0/23(I) Fa1/0/24(I)
Configuration on ports is simple:
interface FastEthernet1/0/24
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable


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Cisco Switching/Routing :: Create New Vlan On 3750 Switch With Trunk Mode

Jan 16, 2013

This is regarding VLAN creation on C3750E switch.I want to create new Vlan 94 on this switch and also I want to allowed same interfaces like Vlan 95 & Vlan 96. [code]

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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 :: 5486 / Mode Conditioning Patch Cable Query

May 6, 2012

I am planning on implementing a mode-conditioning patch solution along with LX/LH SFP's over multimode fiber in my network. I wanted to know if this solution is also supported by the G5486 Gbic's, ie, can I use the 5486 GBIC along with a mode-conditioning patch over multimode fiber as well?

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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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