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 :: How To Debug A TCAM Switch On 877W

Feb 24, 2012

I've created a BVI2 where I bridged dot11 0.2 and vlan2 in order to have wired and wireless clients in the same vlan.Some wired client are not reachable from the lan. Wireless clients have no pbl in reaching each other.Monitoring a MAC address that is supposed to be behind the FA2 I have noticed that it moves to vlan2 when in fact it should be behind the FA2.Of course when "show mac-address-table" says it is behind Fa2 the ping to that MAC address works whereas when the TCAM reports it is behind vlan2 it doesn't. Once the MAC address is behind the vlan2 if I clear the mac-address-table and that mac-address is still put behinf Fa2 then the pings works again, sometime I have to perform twice the clear command before the MAC address goes back to the right location.I'd like to understand why the router moves that MAC address from Fa2 to vlan2 and that's the reason for my question in the subject.I don't have any problems for port Fa0 and Fa1."Show int fa2" doesn't show any problem/errors or the likes.BTW even if I force that MAC address to be statically behind FA2 the ping works fine but then stops and if I do "show mac-add" the static entry for it is still there... so looks like there us something that overrides that static entry. If clear everything and I have the mac-address be behind Fa2 then everything starts to work again. I used Fa3 instead of Fa2 and I get the same results.
IOS: c870-advipservicesk9-mz.151-3.T1.bin

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Cisco Switching/Routing :: 5884A9C - Getting Debug Message On Switch

Sep 3, 2012

I have a message that appears when i run a debug on my switch :
Core1#pak 5884A9C consumed in input feature , packet consumed, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0, fwdchk FALSE

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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 :: 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 :: 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 :: Command To Debug Packets On 3750 Switch

Apr 18, 2012

What other command can be used to debug packets on a 3750 switch ?

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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 :: To Reload The Module 3 On The 6509 Switch

Jul 31, 2012

Suffered a big outage on the network, the fix was to reload the module 3 on the 6509 switch, we had these errors on the log %CONST_DIAG-SW1_SP-3-HM_PORT_TEST_FAIL: Switch 1 Module 3 TestUnusedPortLoopback Port(s)[24,46] failed. System operation the end, we reloaded the card and it was all ok. is there anything I can do to check the card / or any deeper logs? would that error cause the card to crash?

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Cisco Switching/Routing :: 3750x Switch Reload Automatically

Dec 15, 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)
Technical Support: [URL]


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Cisco Switching/Routing :: 3560 - UDLD After Switch Reload

Sep 12, 2010

I have the following problem with

- 2x 3750G-12S Distribution-Switches (DS) and several 3560/2960 Access-Switches (AS)
- redundant Fiber optic uplinks between AS and DS
- Cross-Stack Etherchannel config on all uplinks
- UDLD aggressive mode configured on all uplinks
- when I reload the DS and the switch comes up again, I've lost the connection with several (not all) AS
- looking at the AS log I found the following error message: "%UDLD-4-UDLD_PORT_DISABLED: UDLD disabled interface Gi0/1, aggressive mode failure detected"
- in the log of the AS I don't see intf Gi0/1 go down during the reload of the DS
- this means the DS didn't shuts down all its ports during the reload
- but this also means that UDLD on AS didn't know about DS reload, and therefore didn't resets counters
- I'm now configuring errdisable recovery on all AS
So I'm forced to configure errdisable recovery, even if I don't want.

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Cisco Switching/Routing :: 3750 / Reload Member Switch In Stack?

Apr 5, 2012

I have just upgraded 2 3750 switches in a stack via the master and reloaded the master switch remotely, how can I reload the 2nd (member) switch?

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Cisco Switching/Routing :: How To Get 3560 Switch To Run From New Config File On Reload

Nov 7, 2011

I uploaded a new config file via TFTP to a 3560 switch.  What are the order of commands to get it to boot from this new config file instead of the file listed in 'sh boot': [code]

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Cisco Switching/Routing :: 4506E After Reload Switch / Found That Clock Is Getting Reset

Apr 22, 2012

I have one 4506E switch working in Lan setup as a core switch with WS-X45-SUP6L-E running ipbase IOS 12.2(54)SG1. Each time after reload the switch we found that the clock is getting reset ( time is getting changed ) where as day, date & year is unchanged.

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Cisco Switching/Routing :: Pm Scp Process 100% And Switch 6500-E Crash?

Oct 24, 2012

The switch 6500-E is frequently crashing whenever the pm scp process reach 100% .I got it under the  command "remote command switch show proce cpu".How to solve the problem. I opened the TAC and the engineer says to upgrade the image12.2(18) sxf.Is there any other work around that would avoid to reimage the switch and reloading.

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Cisco Switching/Routing :: 3750x Master Switch Crash?

Jun 13, 2012

About an hour ago I had the master switch on one of my 3750x (WS-C3750X-48PF-S) stacks crash. The only two items we've found that could have caused this issue are the roughly 1.3 million big buffer misses and several of the following in the syslog
SLT:WARN:No exporter configured for smartlog! I do not have smartlogging turned on, nor is there a netflow exporter configured
sh logging smartlogsmartlog is disabledsmartlog exporter:smartlog pkt length: 64 Total pkts processed: 0Total DHCP Snooping pkts processed: 0Total DAI pkts processed: 0Total IPSG pkts processed: 0Total ACL pkts processed: 0
I did not see any traffic spikes prior to the crash.
This stack has been stable since it's last IOS upgrade from 12.2(58)SE1 to 12.2(58)SE2 back in October 2011 so this has me a little worried.

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Cisco Switching/Routing :: WS-C3750X-48P Access Switch Not Reachable And After Reload Started Working

Sep 15, 2012

I had a strange issue with one of my customer..Cisco  WS-C3750X-48P Access switch was not reachable and after reload it started working.I would like to know the root cause of the issue. There were no logs and no errors in interfaces.Even Cpu utilization was not high. We have enabled arp inspection and dhcp snooping in the switch..Hope this will not make any issue..Also we have dot1x enabled on port..

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Cisco Switching/Routing :: 3550 Switch - Software Forced Crash Exception

Feb 7, 2013

Our switch had a little crash-fest this morning at 2:30 AM. I did find a web page about diagnosing Software Forced Crash Exceptions, but it did not look like ours was one of the more easily-identifiable ones.
It may be worth noting that we've only used this switch for about a month, everything seemed fine until now. When we got the switch it did not have any GigE modules, and this week we put 2 into it and have been using them for 2 servers.
It looks like the switch was crashing repeatedly over a period of 20 minutes, and then it stopped and normalized. In the logs of the router that this switch uplinks into, we could see the ethernet port flapping during the time that the switch wasn't reachable.
Here's the Show Stack on the switch:
Sfld_3550#    show stackMinimum process stacks:Free/Size   Name4404/6000   vegas_flash init3352/6000   SaveCrashBuffer5716/6000   CDP BLOB8512/9000   IP Background5596/6000   vqpc_shim_create_addr_tbl5584/6000   SPAN Subsystem5552/6000   SASL MAIN4944/6000   vegas IPC process8704/9000   cdp init process5404/6000   RADIUS INITCONFIG4928/6000   Vegas CrashBuffer5664/6000   URPF stats2536/3000   Rom Random Update


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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 :: 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 :: What Logging Buffered 51200 Debug Do

Jan 7, 2013

what logging buffered 51200 debug do?i saw it on cisco 881 sec k9

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Cisco Switching/Routing :: Can't See Any Debug Message On 1800 Router

Jul 19, 2012

I have strange problem with 1800 router , I can't see any debug messaging , the ping from PC to this router is Ok , but no icmp debug appears , even I enable "debug ip icmp "  the version of router is : C181X Software (C181X-ADVENTERPRISEK9-M), Version 12.4(6)T6

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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 :: 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 :: 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 :: 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 :: Debug Command Not Working On Nexus 5548?

Nov 15, 2012

My Nexus is a 5548-UP model, NX-OS version :  5.1(3)N2(1b)
I try to debug an OSPF and an ICMP problem using the debug ip ospf command and the debug icmp command but not output appear on the terminal. As the switch is remote, I entered the terminal monitor command of course.
SG01NX01# terminal monitor
SG01NX01# debug ip ospf 1 packets
SG01NX01# show debug


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Cisco Switching/Routing :: 6509 Debug Spanning-tree Functions In Lab

Nov 9, 2012

I'm testing debug spanning-tree functions in a lab, hardware is Cisco 6509 with SUP-720-3B and WS-X6748-SFP, IOS is 12.2.33.SXJ. It's a root in some vlan's, stp mode is rapid-pvst.I wanted to see how spanning-tree is working (STP packets dump, etc.), and entered following commands on 6509: [code]
Then, I turned the "debug spanning-tree all" mode on. Now, I expect to see BPDU packets from Cisco, and other spanning tree events in logs on syslog server, or in log buffer, but I don't get anyting there. Except, there're some lines in log (they repeat very rare): [code]

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