Cisco Switching/Routing :: Giving Out Discard Error On 3750E

Apr 4, 2011

We're seeing "OutDiscard" error on a LAN switch connected to newly migrated Cisco IP phones. All the other error counters are clean except for the OutDiscard. (please see attached "show int count err" output.) [URL].

According to the link above, the common cause of such discards can be to free up buffer space.(Am I seeing a switch buffer issue?) How to identify/resolve the cause of the OutDiscard.The switch is 3750-E running c3750e-universalk9-mz.122-44.SE6.bin

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Cisco Switching/Routing :: High Discard Rate Error From LMS For Switch 2950

Feb 13, 2012

As always, the Cisco LMS is keep sending the follwoing high discard error from the Cisco switches WS-C2950T-24:
EVENT ID               = 0004SX3
ALERT ID               = 00019LF
TIME                   = Tue 14-Feb-2012 08:56:35 GMT


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Cisco Switching/Routing :: Nexus 5596 Giving Error In Connection

Aug 28, 2012

I have 2 datacenters running same equipement (two Nexu 5596 with FEX).I just took a look at the log just to see if everything is ok and I saw that I have the same error message (a lot of times) at both location :
%SYSMGR-FEX100-5-HEARTBEAT_LOSS: Service "satctrl" heartbeat loss 2 ,max 7,I though it was a problem with my peerklink-keepalive connection but I see the word FEX i'm not sure...
Note that at both locations, my Nexus are connected back to back through the management port using transceivers. So it's a copper cable from the first nexus,  going into a transceiver, going to another transceiver in fiber and then back to copper to the other nexus.

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Cisco Switching/Routing :: Err-Discard On X2-10-GB-LRM 3750 And 4507

Jan 19, 2012

we have a core switch 4507RE at the data center and 2 departments that connect to it via 10Gig fiber using X2-LRM modules. Each department  has a 3 switch stack and both locations are identical w.r.t type and setup scenario.the stack comprises of  1 x 3750E and 2 x 3750G . uplink is from X2 port tengig3/0/1 from the 3750E switch.
All of a sudden dept B started facing problem , where the ping would break and throughput comes around 6 - 7 mbps   from that dept to the server behind the core switch.   we also noted CRC error on both sides preodically.
we replaced the multimode fiber patch cords, re did the splicing , which  stopped the CRC errors to since morning the uplink port on the 3750E (3/0/1) would suddenly be in "down" state    with (err-disabled) as the status  when i run sh int ten 3/0/1
and i can also see CRC errors and input errors on the same interface..   if i do shut / no shut .. the port is up and active again..    but this has happned 3 times today.the core swith side is still OK and no CRC / input / output  errors are seen..
now on the 3750E i have  swapped the 10gig module from 3/0/1 to 3/0/2 .  the port is still up but i can see 400 CRC and 500 Input errrors.the module is also OK as i had replaced it with dept 1's module.

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Cisco Switching/Routing :: Input Discard On Nexus 4001?

Nov 17, 2011

I have 2 NX4001. Each one has an uplink to a 5K. There is no VPC between the 4K and the 5K. The 5K are  VPC enabled.There is a large number on input discards on the 4001 interfaces connected to the 5K and is incrementing.I have a server with smartfailover that is flapping and I think the input discard might be the culprit.what is the cause on input discard. Note: All NXOS  to the latest.

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Cisco Switching/Routing :: 3560 - Receive Discard VLan

May 21, 2013

I faced the ( receive discard vlan 20 of Cisco switch 3560   ) on my Solarwinds Server .

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Cisco Switching/Routing :: Output Discard Interface Counter In Nexus2000

Dec 6, 2012

reasons for increasing "Output Discard” Interface Counter in Nexus2000 . ????

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Cisco Switching/Routing :: 3560G And 2950 Switch Trunk Discard Errors

Apr 15, 2010

I have two 3560G 24 port switches. Each of them connects to some 3560G or 2950 switches. Trunks between 3560G are set as 1000/full. Trunks between 3560G and 2950 are set as 100/full. show int status also shows the interface negotiation is 100/full for trunks between 3560G and 2950. The issue is I keep getting outdiscard errors in trunks between 3560G and 2950. At 2950 switches, I see Recv-errors too. I checked all the trunks traffic. They are totally not high. Only serveal mbps. Most time even lower than 1mbps.
I googled this kind of issue online. I see it could be possibly caused by high volume traffic higher than the capacity. But it appears the traffic there is not high enough to cause this kind of issue. Is there any possiblity that could cause this problem?
The below is 3560G trunk configuration for 2950 switch
interface GigabitEthernet0/10 switchport trunk encapsulation dot1q switchport trunk allowed vlan 1-122,124-4094 switchport mode trunk speed 100 duplex full srr-queue bandwidth share 10 10 60 20 queue-set 2 priority-queue out mls qos trust cos auto qos voip trust
the trunk configuration at 2950 switch: interface FastEthernet0/24 switchport trunk allowed vlan 1-122,124-4094 speed 100 duplex full

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Cisco Switching/Routing :: How To Use BGP On 3750E

Dec 8, 2012

I need to use cisco 3750E switch on core. I want to know whether BGP is supported on this model or not?Currently i have c3750e-universalk9-mz.150-2.SE/c3750e-universalk9-mz.150-2.SE.bin" preinstalled. and i checked BGP is not supported on this IOS image.

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Cisco Switching/Routing :: 3750E / Applying ACLs When Routing Between SVI And Routed Interface?

Mar 12, 2013

Quick question here. Using 3750E series switches with multiple VLANS configured. These switches serve as our 'core'. I have SVIs configured for the different VLANs and add inbound ACLs in each of the SVIs to control traffic between VLANS. This switch also terminates a P2P Ethernet link which connects to our Colo facility. The port used for this is configured as an L3 port. I noticed today that I was able to send traffic across this L3 link that I thought should have been blocked by an ACL I had in place but it wasn't. So the traffic flowed from a port in say VLAN 20 across this L3 link (assigned with an IP address). Would this traffic flow not cause traffic to be checked against an ACL applied in the inbound direction on the SVI of VLAN 20 (int vlan 20)? Traffic does get checked when routing between SVIs. Why would it not get checked when routing between SVI and L3 interface?

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Cisco Switching/Routing :: Upgrading 3750E From 12.2(58) To 15.0(2)

Jan 31, 2013

I am in the process of upgrading our network switches and wondering if the .lic file will work with the new software or if I have to rehost for the move to 15.0.  Its a remote site and I would like to get some solid info before I pull the trigger.
Also which IOS should I be upgrading to?


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Cisco Switching/Routing :: Packet Discard On Nexus 5020 Link To Nexus 5K

Feb 23, 2011

We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]

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Cisco Switching/Routing :: Stacking 3750G And The 3750E?

Nov 20, 2012

have 2 3750's one is an 3750E the other one is a G... Since they are 2 different versions Do I need to correct ios for each for example my 3750E switch i would have
 c3750e-ipbasek9-mz.122-53.SE2.bin        and for my 3750G switch should i use
Which would be 2 separate images

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Cisco Switching/Routing :: Stack Cables For 3750e?

Nov 13, 2011

Can I get a stack cable longer then 3m?

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Cisco Switching/Routing :: 3750E RACL Slow To Load

Apr 16, 2012

I am seeing on my 3750E series switches (WS-C3750E-48TD). I have multiple VLANs configured on here, one which is used as a 'workstation' VLAN. I have an inbound ACL applied to the VLAN interface *(int vlan 50 to be exact). This list is admittedly long at roughly 6000 ACE's. Now I just recently installed these switches as they replaced some 4507R switches which we moved to our new centralized DC. Here is the issue I am having. This same ACL was applied to the same VLAN interface on the 4507s when they were doing the work of the 3750s. What I used to be able to do was actually edit the ACL by removing it with no ip access-list extended WS-In and then followed up by the ip access-list extended WS-In ......and the lines I wanted in the ACL. I know I could use the line numbers to edit the ACL but this worked OK for me. When I would do this on the 4507R, the ACL was still applied to the interface but traffic never seemed affected by the removal and re-adding of the ACL. I did this by copying and pasting the ACL into a terminal window. It seemed as though on the 4507 the ACL was not compiled until the entire thing was in loaded in and therefore traffic was not processed by the ACL until the load was done

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Cisco Switching/Routing :: 3750E NetFlow Commands Available On Switch

Oct 30, 2011

I have a 3750E stackable swtch and I need to configure neflow on it.  Are there any IOS versions that support netflow on the 3750E?  Is there any possible to configure netflow on a 3750E?  I do not see any netflow commands available on the switch?

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Cisco Switching/Routing :: Difference Between Catalyst 3750e 48 And SF300-48p?

Apr 11, 2012

what is difference between Cisco catalyst 3750e 48 and SF300-48p.

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Cisco Switching/Routing :: Stacking Switch 3750E And 3750X?

Oct 3, 2012

can I make the stacking of these two switches WS-C3750E-48PD-SF and WS-C3750X-48PF-L. Both have universal IOS.

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Cisco Switching/Routing :: Timeout For Mac Address Table In 3750E

Dec 6, 2011

I have 3750E swiches with IOS v. 12.2(55)SE3. Couple servers connect to ths switch, after ping of IP this servers I can see mac addresses in mac address table.
For instance:
sw1#show mac address-table vlan 20
          Mac Address Table
Vlan    Mac Address       Type        Ports(code)
----    -----------       --------    -----
When ip generate traffic to this server this mac address appear in table again on shot time (less than 10 seconds).

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Cisco Switching/Routing :: 3750E - Monitoring TCAM Usage

Nov 30, 2011

I had a lot of problems with TCAM table in the past and made changes in SDM ended whit that. But now want to be proactive and anticipate the problems in my TCAM table.
If the my template is "default desktop" they support a number of indirect IPv4 routes of 2k. I wanna know automatically by my management tools if this number reaches 1.9k.
That way I can take corrective actions before the problems starts on my network.

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Cisco Switching/Routing :: 3750e InterVLan With RVS4000 Gateway

Jan 4, 2012

I have a RVS4000 connected to my cable modem which I use as my gateway, the IP address of the RVS is
I have a 2811 with 3 subinterfaces of which I can ping all of them from my PC which at the minute is in VLAN 1, the only network that can connect to the outside world is VLAN 1, how can I enable the other 2 vlans to connect to the internet?
My set-up details are
interface FastEthernet0/0.1
description *** Data Network***
encapsulation dot1Q 1 native


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Cisco Switching/Routing :: Can't (write Mem) After Adding 3rd 3750E Switch

Mar 10, 2008

After I added the 3rd 3750E to my stack on Sunday I can no longer save my configs with  'copy run start' or 'write mem':
#copy running-config startup-config
Destination filename [startup-config]?
Building configuration... 
nv_done: unable to open "flash:/"
nv_done: unable to open "flash:/"
nv_done: unable to open "flash:/"[OK]

my flash seems to have plenty of space:

57409536 bytes total (24203776 bytes free)

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Cisco Switching/Routing :: 3750E ACL Marked Traffic Are Not In Correct Queue

Apr 22, 2012

We tested a QoS in a Cisco 3750E, IOS: 12.2(58)SE2.Voice traffice in the correct Q without any problem, but all the others traffic the Defualt Q (0), tried to capture the traffic and tcp/udp port are correct.Any thing wrong with my ACL or DSCP - CoS?? ( that ACL works fin on 4500 and 6500) [code]

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Cisco Switching/Routing :: 3750E Debug Causes Switch To Crash And Reload

May 3, 2013

I am not able to find the exact bug for Cisco 3750E stack - Debug Exception (Could be NULL pointer dereference) Exception (0x2000) error. Closest i can find is CSCsa72400 which only affects ver 12.2(20)SE4.All the stacks (3 switches) are running 12.2(50)SE3, It appears that the switch 1 crashed and reloaded. My hunch is its software but i cant find any related bugs. It could be hardware issue as well ?

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Cisco Switching/Routing :: 3750E / Traffic Prioritization Involving VLANs?

May 30, 2012

I have a device which will be sending voice and data packets and is able to mark the packets with DSCP values.   Voice, 18 and Data 42.If this was a straight through network, I'd be clear on how to handle this, but.....I will be putting this traffic into a VLAN to isolate it from some other traffic on the network.  What is the best way to prioritize this traffic inside the VLAN?  Will the Cisco switch look at and respect the DSCP values inside the VLAN and prioritize accordingly inside the VLAN?  Or, do I need to do some sort of DSCP to 802.1p mapping? Another option I would be fine with would be mapping the DSCP values for voice and data to two different VLANs and then giving the voice VLAN priority over the data VLAN .... I'm using 3750E switches.

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Cisco Switching/Routing :: 3750E-1 Meaning Of Backup On HSRP Statas

Oct 25, 2011

What is meaning backup on HSRP statas?There are 5 vlans.The other four vlans aren't backup status.Only one of five vlans display messeages. When I reload Catalyst3750E-1,debug log. [code]

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Cisco Switching/Routing :: Can Stack 3750G-12S-S Switch With 3750E-24TD-S

Apr 22, 2012

Can we stack a 3750G-12S-S switch with a 3750-E-24TD-S switch?

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Cisco Switching/Routing :: 3750E - 10Gbe / Slow Read Speed From NAS?

Nov 7, 2012

9x3750E stacked switch (WS-C3750E-48PD-SF0) (15.0(1)SE2 
2x10Gbe uplinks from EMC NAS
At a basic level, we have found that the 10Gbe uplinks have slow read performance with or without a port-channel configured (2-3 minutes for a 700MB file to desktop from the NAS) We switched back to testing a 1Gbe and the read speed is normal. Another anomaly is Win7 / 2008 machines read speed is fine from the NAS  while the 10Gbe uplinks are in production?!
Write speed is great on 10Gbe. Only read speed is affected!! the switch is not reporting anything abnormal. We looked at SMB/SMB2 as another possible cause...
mls qos is enabled on the switch but not sure if this is affecting performance.
Is the ANY config that I need to carry out on the interfaces to get the read speed working as it should for both Win7 and WinXP. (MTU is 1500 throughout the enterprise, NAS included).

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Cisco Switching/Routing :: 3750E - Status Lights On Left Lit Up But No Ports On

Oct 16, 2011

I have installed and configured 2 new WS-3750E-24TD in the last 30 days, that have software version 12.5(50)SE2-universalk9, on our flat Development LAN  (currently 7 existing WS-3750E-24TD with 12.5(35)SE2-universal)The new switches have shutdown, 1 has shutdown twice and I just had the other one shutdown on the weekend, all the status lights on the left are lit up but no port lights are on, I am not able to console in to the switch all I can do is cycle power. I am planning on upgrading all switches to the latest software release  universalk9-mz.150-1SE
could this problem be a version incompatibillity between the switches?

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Cisco Switching/Routing :: Finisar 10Gb/s X2 Modules In 3750E IOS15.0?

Jun 13, 2012

We have many 3750E's and need to use Finisar X2 modules FTLX8541E2. After 15.0(1) IOS upgrade the 3750's now recognize the Cisco part X2-10GB-LRM's, but will not recognize our Finisar modules.

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Cisco Switching/Routing :: Cross-Stack 10-Gigabit EtherChannel On 3750E / 3750-X

Jan 28, 2012

According to the following Cisco webpage, cross-stack 10-Gigabit EtherChannel is possible on the 3750 with up to two 10-Gigabit modules, using LACP: url...However, the webpage doesn't confirm if this functionality is restricted to a particular 3750 model, such as 3750E, or if it applies to all models. It also doesn't specify any particular IOS feature set. I've tried Cisco Software Advisor but it doesn't list this feature on either the 3750E or 3750-X. This is possible on the 2960-S switches (i.e. cross-stack 10gig EtherChannel)?

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Cisco Switching/Routing :: 3750E - Sequestering Traffic On A Router-enabled Port

Nov 20, 2011

Is there a way to use the "no switchport command to enable routing on a port and yet sequester it from traffic on other vlans within the switch?
The switch in question is a 3750E

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Cisco Switching/Routing :: Cat 3750E Failed To Send HRPC Non Blocking Message

Mar 23, 2012

I have a stack of Catalyst 3750E switches.

IOS image :c3750e-ipbasek9-mz.122-55.SE3.bin

I have been seeing multiple occurance of the below message in the switch logs.

"Failed to send hrpc non blocking message"

I could not find a relevant reference for this message in the

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