Cisco Switching/Routing :: Catalyst 3750 Low On Memory
Jul 25, 2012
have 3 Catalyst 3750 in same stack, the IOS version is 12.2(53)SE2. Today we can not telnet/ssh to this switch, but ping is ok, and switch function is ok. I try to access the console port, it show "low on memory, try again later". After I reboot the master switch in the stack, the master switch change to another switch, then I can telnet/ssh to this switch. I check the Ciscoworks server syslog report, there are many MAC address flapping error message, and I beleive the MAC address flapping occured before several weeks. ( the G2/0/15 & G3/0/15 is connect to a VMware ESX server and the EtherChannel config mismatch with this Catalyst 3750 switch ) How to mention the root cause of the "low on memory" problem and what is the abnormal memory usage ( free memory percentage below ?% )?
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Nov 22, 2011
Today, one of our Cisco 3750 got unmanaged from NOC, we were able to ping the switch, also, traffic was flowing fine but not able to telnet or local login.On trying to login through console following messages were coming:
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
[code].....
We given power on reset, after which we were able to login switch again. I wanted to know the actual reason behind it and if there is any other way to recover switch other than power reset.?
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Oct 21, 2012
I have Catalyst 6509 E with redudant SUP720-3B (and MSFC3) running 12.2(18)SXF6 IP Services Lan Only IOS (this IOS requires 512MB DRAM and 64MB of flash) SUP has 512MB DRAM (458720K/65536K) and 512MB sup-bootdisk:, but, there is65536K bytes of Flash internal SIMM (Sector size 512K).
My question is can I put 12.2(33)SXJ3 IP Services Lan Only IOS to this 6500 because this IOS requires 512MB DRAM and 512MB od flash?This is "sh ver" and "dir all-filesystems" of my 6500:
cat6500#sh verCisco Internetwork Operating System Software IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9-M), Version 12.2(18)SXF6, RELEASE SOFTWARE (fc1)Technical Support: [URL] Copyright (c) 1986-2006 by cisco Systems, Inc.Compiled Mon 18-Sep-06 23:59 by tinhuangImage text-base: 0x40101040, data-base: 0x42D90000
ROM: System Bo
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Nov 1, 2011
the problem shows an error in a switch catalyst 2900XL - its a 2924 -, i was copying the image of the ios via xmodem and before finished the the power energy in the facility shuts down, when the energy supply returns the switch get power energy normally but the flash memory doesn't initialized and the loader stuck when i try to initializy the flash or reset
this is the error that shows me:
switch: flash_init
Initializing Flash...
flashfs[0]: 21 files, 2 directories
[Code]....
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May 6, 2013
after upgrading about 35 Catalyst 2960 and Catalyst 2960S to IOS 15.0(2)SE2, we experience a memory leak on several switches. After some days / weeks the switches are not accessible via Console/Telnet/SSH/Web any more. Only SNMP seems to work properly.Attached users do not experience any decrease in service.
Trying to connect to the console, we get following error message:
"% Low on memory; try again later"
The only (temporary) solution is to reboot the switch. The behavior is similar to Bug CSCts52797.With regards to the Bug notes this bug should only affect Catalyst 2960 with 64MB of RAM and should already be solved with IOS 15.0(2)SE2.
We experience the erroneous behavior with
-WS-C2960-48TC-S running IOS 15.0(2)SE2
-WS-C2960S-48LPS-L running IOS 15.0(2)SE2
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Sep 6, 2012
I have a Switch WS-C3750E-48PD-SF with IOS 12.2(58)SE2 which reports more than 80% in utilization of memory I don't know what is causing the high memory utilization.
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Dec 26, 2012
We are having 3750 Stack switch as our edge switch. Here we are having some issues as low memory & itermediate High CPU utilization.For memory when we checked its shwoing maximum memory is allocated to DHCPD receive & ARP Input as follows
Processor Pool Total: 70829380 Used: 56809532 Free: 14019848
I/O Pool Total: 12582912 Used: 8554920 Free: 4027992
Driver te Pool Total: 1048576 Used: 40 Free: 1048536
[code].....
i want to understand why this 2 proceses (DHCPD & ARP input) taking more memory?High CPU: We also facing intermediate high CPU utilization (above 95%). When CPU is high there were 2 processes consuming more CPU are 'Spanning Tree' (about 20%) & ARP Input (about 66%). we also checked the ARP entries, there were 1500 ARP entries & 2 incomplete ARP (out of 6000 ARP supported)
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Jan 21, 2012
I have a new cisco 3750 stack comprised of 8 members (6 x 3750G-48PS and 2 x 3750V2-48PS) running 'c3750-ipservicesk9-mz.122-58.SE2.bin'. I am seeing high memory utilisation, it seems to sit fairly stable and I do not see an increase but this has only been running a few days. No errors or performance issues. Should this be a cause for concern?
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Sep 12, 2012
We have a 3750 stack with a mix of 3750G and 3750X switches. The current active template on the switch is desktop default and we are running EIGRP on the switch with large routing table so we get the TCAM error that a specific prefix cannot be programmed in TCAM memory so it will be software forwarded.%PLATFORM_UCAST-4-PREFIX: One or more, more specific prefixes could not be programmed into TCAM and are being covered by a less specific prefix, and the packets may be software forwarded
This error is quite frequent on a daily basis. My question is that will this error create a high CPU situation and affect traffic processing on the stack causing ESX Hosts to become unresponsive?
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Jan 15, 2012
Has any come across show ver memory details on 3750G-48PS as below, One of our Catalyst 3750G running software 12.2(44)SE2 shows unexpected DRAM as below:
cisco WS-C3750G-48PS (PowerPC405) processor (revision F0) with 0K/12280K bytes of memory. This would equate to around 11MB memory which does not seem right... Is it a known IOS bug?
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Apr 9, 2013
my Catalyst 3750 switch. Following a power cut the switch no longer boots up. The SYST light flashed green but no POST checks are made. I cannot see any boot messages from the console port either. The switch was on a UPS but some thing may have damaged the switch.
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May 13, 2012
There is a requirement to configure tacacs and radius on catalyst 3750X (version 15.0) where two vrf exist.Is therer a solution to configure "tacacs-server,host x.x.x.x vrf yyy" ?? I know it is possible to configure under the "aaa group server radius xxx" the command "ip vrf forwarding yyy".Is there anything else for the tacacs-server and radius-server command?
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Feb 18, 2012
Is is correct that vlan's exceeding 128 runs without spanning-tree.?
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May 2, 2012
I have Catalyst 3750. and 2 ISPs
I wanted to use, let say on port5 of Catalyst 3750 only 2nd the ISP will route to this port.
The rest is pointed to the 1st ISP.
Im thinking of using VLAN..
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Oct 24, 2012
I have a network with a Catalyst 3750 as the main switch and then some Catalyst 2960 switches that are plugged in to that. I have a server running windows server 2008 with a couple of virtual machines running in Hyper-V. I created 4 VLANS listed below and gave the 3750 the following IP Address.I would like the 3750 to only be configurable from VLAN 40 but currently every VLAN can connect to it, I noticed in the standard web page settings there was a setting for "Management VLAN" but it was set to 1 and would not let me change it, I kinda assumed that was for the management port in the back.-Now the tricky part, I was trying to set up routing between the VLANs and so far I have only been able to get a sort of "all or nothing" routing to work. I can turn IP routing on and add two or more VLANs to the routing and it works fine. But what I was hoping to do is create a couple of "junction vlans" that would only route to one or two other vlans. For instance, I wanted to create a VLAN 100 that routed to VLAN 20 and 30 but nothing else. I also want to route VLAN 1 just to VLAN 30, and so on. I am able to do each one of the cases but only one, it seems like the switch only supports one "routing table" am I missing something or is this just a limitation of the switch?
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Oct 28, 2012
I have a network with several catalyst 2960 switches and one catalyst 3750. I have created two VLAN and set up the proper routing and everything is working fine there. I have a client/server application that used multicast in the initial start up for the client to determine available servers, the issue is one of my clients is on a different VLAN then the server. I am able to route the multicast using MVR as long as both the server and the client are plugged into the 3750 by creating a static route, making the server a source port and the client a receive port. Unfortunately I need the client and the server plugged in to different 2960s. My question is how do I establish multicast routing between the two and perferably do it dynamically (always route multicast traffic from one VLAN to another).
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Dec 17, 2011
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet. I think it has to do with the routes. [code]
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Apr 16, 2012
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net. My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20,I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2),my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to,go out to the internet.
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Oct 11, 2012
I was browsing the Software Adviser on Cisco's website to look for a suitable IOS image, for a 3750. The system displayed a couple of suggested IOSes. there was no mention of IOS 15.0SE version.Could the Software Advisor be not up to date with the current Catalyst IOS releases?
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Dec 31, 2011
I have CISCO catalyst with VLANs (VLAN ID 33, 36, 40-53) configured. I need to configure port mirroring in Switch 3750 for NAC (Network Access Control). I need to Monitor all the VLANs. Here is the SPAN configuration of switch: [code] Monitor session 1 source vlan 33 , 36 , 40 – 53.Monitor Session 1 destination interface fa 1/0/8 (here I am not able to set encapsulation dot1q ) because the error occurred saying %one or more dest port do not support the encapsulation%.
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May 28, 2013
I have customer who has as Core Switch one Cisco Catalyst 3750 with the IOS c3750-ipbase-mz.122-35.SE5.I know that this image support DHCP Server configuration, but I like to implementate new vlans (approx 15) and I want to know if this switch support 15 DHCP Servers.
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May 27, 2013
How to setup a port channel between a SG200 and 3750 and am having problems.
What do I need to do on the SG200 I have added the port into the lag but the port will not come up.
I spent half a day messing arround with the web interface and I am unable to get the port to come up.
The Cisco 3750 is a standard port channel config which I have setup maytime before. channel-group 1 mode active channel- protocl lacp Switchport mode trunk
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Oct 13, 2012
I am working in an environment where i have to use more etherchannels, any way that how many etherchannels could we create on Cisco Switch 3750 e. do they can utilize high process resources of CPU.
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Nov 20, 2011
if I read the Datasheet of Catalyst 3750X-Series-Switches it is possible to connect a new X-Switch to an existing and old Catalyst 3750-Series Stack.What kind of requirements are needed? Only same IOS-Version in the hole Stack and if possible same Feature-Set? .... like in a normal NOT mixed Stack?
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Nov 8, 2012
I have 3 VLANs here that need to be on the same network segment. They are going to be used by our Wi-Fi network (with Aironet APs), bound to 3 different SSIDs (as Aironet APs doesnt allow multiple SSID per VLAN), each one with a different authentication method and server.Is there a way to bridge those VLANs together with a Catalyst 3750 switch? I tryed configuring an IP address on one of the VLAN interfaces, then configuring a bridge with the vlan-bridge protocol (Catalyst 3750 doesnt have the "ieee" bridge protocol type) and put all 3 VLAN interfaces on the same bridge-group, but it didnt work (even with "bridge x route ip").I also tryed configuring IRB bridging, with the 3 VLAN interfaces on the same bridge-group and an IP address on the BVI interface (the way I used to do with old 2600 routers). Same result.(actually, I didint test to see if the interfaces are actually being "bridged", but I see neither of them can reach the router)
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Apr 24, 2012
Is it possible to configure LACP etherchannel to a Catalyst 3750? Playing around with the SMB switches for the first time.
I know how to do it on the 3750 but am having trouble figuring out the sge2000p.
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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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May 7, 2012
I am trying to use a SF302-08P switch to connect a conference phone (Cisco 7937) to my infrastructure. I connected the G2 port on the SF302 to a Gig copper port on the Catalyst. I configured both ports as trunked ports and port e1 on the SF302 as an access port for the phone. VLAN 1 is the default VLAN and VLAN 10 for voice. However, the phone does not connect to the Call Manager. I have changed the configurations on the G2 trunked port and the ethernet port (trunked ports, general ports, tagged and untagged). I have also changed the configuration on the Ethernet port (general, access, trunk, set it on the default VLAN, in the voice VLAN, etc.) The SF302 connects to the Catalyst, and PCs connect OK.
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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
[code]......
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
[code]......
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Jul 16, 2012
Our servers are hosted at the Main site, site office A access to the Main site for Internet and servers. We are thinking NextG to take over when the link between sites goes down.
To start with, what is the configuration for 3750 at Site A and the Main site:
1) Trunking for both switches
2) Routing
3) the automatic failover configuration for the switch at Site A.
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Jan 31, 2012
I have the wrong code on the device. I can get to the switch: prompt. The manual say to connect a PC to the management port. But it does not come up. x modem does not seem to work. I found some commands :
Examples : This example shows how to clear the Ethernet management port statistics: switch: mgmt_clr
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Oct 8, 2012
I have Cisco Catalyst Stack structure that consist of;
3750E-48TD-S (MASTER) (UNIVERSAL Image)
3750G-48TS-S (IPBASE Image)
3750G-48TS-S (IPBASE Image)
3750G-48TS-S (IPBASE Image)
I want to upgrade their IOSs to k9 images.
I can not dowload Universal Image file from Cisco website because of the expired service contract. I have IPBASE IOS files for all switches,
Can it be a problem to upgrade master switch IOS from Universal to IPBASE image?
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Feb 19, 2013
In my ongoing project i need to monitor cisco 3750-X port status (uplink/downlink) i.e. whenever there is some problem at a specific port. I need to monitor it through an OPC server and right now what i am doing is as follows: i am using Kepserver and i have added SNMP driver in it for that purpose i am not a networking expert but what i have learnt till now is that SNMP agent (that resides in switch) delivers the status of MIBs to SNMP manager ( which in my case is kepserver (opc server)) for the above purpose i am adding IF-MIB to monitor OID 1.3.6.1.2.1.2.2.1.8 (which shows port statuses) but when i add that in OPC server then it indicated that this OID is not available in the Switch ( it might be disabled) so i need to ask if there is any way to enable OID's in a switch,
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