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 :: Portchannel Between 6509 And 4506 Does Not Come Up After Reloads?

Jun 8, 2012

a 6509 and a 4506 with 2, 1gb interfaces in a portchannel.   Bring it up and everything is fine.  Save the config and reload either switch and the interfaces stay in Not Connected state.  Either doing a No Shut or a physical unplug the SFP and plug it back in will bring it up with no issues.  Interfaces do not go into Err Disabled state they stay in Not Connected like there is no fiber plugged into it.  No error mesages in the log.  The Just the Interface is now up.Both are running very new code,
6509 - s2t54-ipservicesk9-mz.SPA.150-1.SY1.bin (  15.0.(1)SY1  )
4506 - Version 03.02.00.XO

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Cisco Switching/Routing :: 7609 Portchannel Load-Balancing

Oct 23, 2012

I'm trying to make MGSCP solution. I have Cisco 7609 with following configuration:

Mod Ports Card Type                              Model             
--- ----- -------------------------------------- ------------------
  3    8  CEF720 8 port 10GE with DFC            WS-X6708-10GE     
  5    5  Route Switch Processor 720 10GE (Activ RSP720-3CXL-10GE  
  7   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP      
  8   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP      
  9   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX.

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Cisco Switching/Routing :: 4500 Sup6E Auto QoS Configuration On PortChannel

Jun 28, 2012

I configured Auto QoS on some access ports on two 4506-E (Sup 6E-L) and I wanted to apply the same generated config on the port channel/port channel members but it didn't work.
int gig1/3
service-policy input AutoQos-VoIP-Input-Cos-Policy
% A service-policy with non-queuing actions should be attached to the port-channel associated with this physical port.


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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 :: 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 :: 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 :: 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 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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Cisco Switching/Routing :: Connecting 3750 Stackable Switches

Nov 13, 2011

If I have two switches in a stack can both stack able switches be connected to a core switch through gbics or just only one switch can be connected to the core and the other switch connects to the other stack able switch through an Ethernet port which uses as a gateway to the core switch?

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Cisco Switching/Routing :: How To Add Four 3750 Switches Into Existing Stack

Sep 22, 2012

I have 3 3750  staking switch with the following configuration:

                                            H/W   Current
Switch#  Role   Mac Address     Priority Version  State
1       Member 442b.0350.9400     1      1       Ready              
2       Member 442b.0357.8780     2      1       Ready              
3       Master 442b.036f.a800        3      1       Ready              
The new switch is installed to be wired to the master switch. the swtich 3 (* 3 Master Ready 442b.036f.a800)my question is: if you disconnect the wiring from the master stack to connect to the new switch, it is possible that the new switch change the current configuration of stacking.
-Can I just add the new switch with clean configuration without changing the current configuration ?
-How is assigned the stack number? i need the new switch be with the GI4 / x?. I can I manually by assigning ports?
-If I want to the new 3750 member witch lower prioridad, can I change priority before adding to stack?

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Cisco Switching/Routing :: 3750 - Fiber Uplink Between Switches

Nov 3, 2011

I have three switches:
primary - Cisco Catalyst 3750G-24TS-24
and two SG300-28
I need to apply uplinks as follows:
3750G-24TS-24 SFP (1) -> SG300-28 (first) mini-GBIC (1)3750G-24TS-24 SFP (2) -> SG300-28 (second) mini-GBIC (1)SG300-28 (first) mini-GBIC (2) -> SG300-28 (second) mini-GBIC (2) 
I would like to know, What type of mini-GBIC and SFP and cable I should use for SX Multimode?What max speed rate I will get?  

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Cisco Switching/Routing :: Power Series Cabling On 3750 Switches?

Oct 22, 2012

I am connecting power cable (series power cables) on 3750 stacks. i have connected them the same way the stack cables are connected i.e. fo rexample on a stack with 3 3750s:
1- fitst slot on fist switch connected the second slot last switch in the stack.

2- second slot/ port on the first switch to the first on second and seoncd on teh second switch to first on the third switch.
this how they are alway been stacked.Now, I need to connect power cables and I have followed the same method for stacks up to 4 switches. it seems that if a stack has more tham 4 switches, then the cabling will be dofferent!?I was wondering what will be on the cabling scheme for stacks more than 4 switches.

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Cisco Switching/Routing :: 3750 V2 / Fully Redundant Switches Meaning?

Jun 2, 2013

let me know the exact meaning of attach ( yellow marked one)? the contractor was saying "it doesn't mean two switches as there is a built in redundancy in Cisco switch)"I don't think he is correct as I never heard about built in redundancy in Cisco Router/switchAny comment as this will affect the numbers from 55 (3750 v2) to 110....

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Cisco Switching/Routing :: 3750 STP Vlan 21 And 22 Root Bridge On 2 Switches

Feb 16, 2013

I config vlans 21-23 on 3750 A and B switches.I config B  switch to be Root Bridge for all vlansspanning-tree vlan 1,21-23, priority 4096 sh span tree on B  switch 3750B#  sh spanning-tree.

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Cisco Switching/Routing :: 3750 Switches Doesn't See Traffic From Other Network

May 21, 2012

we have three separated network segments going to one Cisco 3750 switch all is L2 .. from this switch is 100 mbit uplink.we need to apply some Qos mechanism not to saturate line by traffic from one network.. Configuration from various reason CANNOT be done on switch where 100Mbit line is terminated.. so all must be done on SW1,2,3..Correct me if iam wrond but as switches doesnt see traffic from other network iam affraid only think we can do  is limit bandwidth on links going into SW1,2,3 to 33 Mbit.I found commad srr-queue bandwidth limit.But links going to SWs are 1Gbit so if i force bandwidth to 10% (minimum what command allows) its  100 Mbit..If I force speed on those links to 100Mbit and than apply  srr-queue bandwidth limit to 30% doest it work.??. Will  srr-queue bandwidth limit speed to 30Mbit?? Or srr-queue bandwidth limit is calculated from maxim speed of interface?

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Cisco Switching/Routing :: Lights On All 3750-X Switches Blinking Rapidly?

Jan 21, 2013

We recently installed 15 of these switches, and we're having a few odd, random network issues. But before I enumerate those issues, I have a simple question: are the connection lights on these switches *supposed* to blink rapidly? Or are they supposed to blink *normally*?On all other switches I've ever seen / worked on / worked around, when a cable is plugged into a port, the connection lights blink upon network activity. sometimes they blink a little faster when there's lots of activity, but mostly it's an almost lazy, random kind of blinking.  When you look at a switch and every light on every port that's connected is blinking very rapidly, your first instinct is "No *wonder* nothing works around here!" and you find the port that's chattering and unplug it...all the blinkies go back to normal.Well, on the 15 switches we've installed, every light that's on blinks rapidly, as if there's an uncontrolled storm going on. Is that the "new norm"? Did I miss the memo, and there is nothing to be worried about here? Or are the rapidly blinking lights telling me there is, indeed, a problem?

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Cisco Switching/Routing :: 3750 Switches With All Optical Fiber Ports?

Feb 14, 2013

We have a scenario where we want to connect 14 access layer  2950 switches to Core switch 3750 via optical fiber in a LAN.What model of 3750 Switch should we use to tackle this situation.I have learnt that WS-C3750X-24P should support it.Isnt it?
Can we use optical fiber SFP module to connect 2950 switches to core switch?Does Cisco 2950 Switch support optical fiber sfp module?

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Cisco Switching/Routing :: Catalyst 3560 / 3750 - Can Ping PC From Switches But Not From PC

Feb 19, 2013

We have a couple of Cisco switches and connected a (Windows 7) laptop to one of them and it gets its IP address from a DHCP server.I can now ping the IP from all of the switches, no problem, also not when I log on to the core switch in the same VLAN as both notebooks. But from my (Windows 7) laptop, which is in the same VLAN as the target laptop, I cannot ping it.
I checked, default gateway is good on both sides, as are DNS servers.
Target notebook ---- Catalyst 3560 V2 switch === Core Catalyst 3750 switch (stack) === Catalyst 3560G switch --- My notebook

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