Cisco WAN :: Cat3750 / Unable To Support Netflow?
Sep 25, 2010
I currently have Netflow enabled on all of my routers in my network. However, I have a Cat3750, which does not support Netflow. The 3750 is at a larger remote site and I need visibility into the traffic that is traversing internal to that switch. All VLANs are configured on the 3750. I have an extra Cisco router, which I have theorized I could use as a Netflow probe.
The 2811 Router has to FastEthernet ports.F0/0 would be configured with no IP Address and would be connected to the 3750 on G0/1 with no VLANs configured.F0/1 would be configured with a static IP and connected to the 3750 on port G/02 with the appropriate VLAN to ensure network connectivity.
On the 3750, configure a monitor session with a destination of Interface G0/1.On the 2811, configure netflow to sent to the Netflow server and set F0/0 for ip flow ingress.Obviously, it doesn't work. But I cannot figure out why.
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Jan 9, 2013
i just came to know Assurance feature license doesn't come for free when upgrading from LMS4.2 or NCS1.1. It has to be purchased. Before buying this license, i would like to know if IPv6 netflow is supported.
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Aug 1, 2011
Do you know if the following Cisco switches ME3600X ME3800X support Netflow? I need to collect data on interfaces and export it to an external Netflow collector installed on a server. In other word, I need to be sure that those switches support the following command (or similar):
ip flow-export destination <IP> ip flow-export source <Interface> ip flow-export version 5 ip flow-cache timeout active 1 ip flow-cache timeout inactive 15 snmp-server ifindex persist !
[Code].....
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Apr 23, 2012
What are the limitations of Net flow v9 support on the 7600 platform for the SR code releases?
I know that Flexible Net flow is only available on newer releases with some newer hardware. Flexible Net flow gives you the ability to provide full support for Netflow v9 as well as IPFIX.
However, the documentation indicates that Net flow v9 is still supported in the SR code. So I am just trying to find out what are the limitations in how Net flow v9 is implemented without "Flexible Net flow". The Cisco TAC was unable to provide me any documentation about this.
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Jan 28, 2013
I was working with Opmanager software to monitor my network, and i downloaded the Netflow plugin, i tried to enable the netflow on my core switch c3560 but I was surprised that it does not support the NetFlow, after many resersh most of URL's say it does not support until i found another URL from Cisco Says that it support Flexble netflow now, but i think we should update the IOS.
[URL]
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Nov 14, 2012
I searched around but did not see any valuable info on this so I guess it doesn't. But wanted to get confirmation from you guys.
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Feb 6, 2012
I am trying to use the following commands on the switch but it is not supported:
ip route-cache flow
ip flow-export destination
Attached is the output for show version and show module commands from the switch.
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Dec 25, 2011
I need to know if Cisco Switch 2960 support Netflow. If it doesn't, how do I configure the switch to enable Netflow?
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Jun 8, 2009
I can't seem to find any information on the Nexus 5000 support of netflow. I assume that means it doesn't do netflow.
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Feb 8, 2012
I'm looking at implementing a new DMZ and wanted Netflow capability for security monitoring.The architectural principles I have to adhere to dictate that the switches within the DMZ are layer 2 however to get Netflow I need a minimum of a 3560/3750X, Network Services module, IP Base IOS with ip routing and CEF enabled.To do this and still keep the switch functioning as a layer 2 device the intention was not to configure SVI's or any static/dynamic routing protocols.Will Netflow still work in that scenario?
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Dec 5, 2011
I know the Nexus 5548P hardware does not support Netflow.I just need to know that if we introduce the layer 3 Daughter Board N55-D160L3 does this add Netflow support?
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Sep 17, 2012
I've been researching the 3750-x Netflow support but I'm not 100% sure of how much support it has. From what I've read the only way to get NetFlow support is to install a specific module that provides NetFlow. I also heard about how it might support s-flow but I haven't found out for sure.
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Dec 17, 2011
I am working with a Catalyst 4503-E with a Sup7-E. I'm trying to enable Netflow, and I have read the following guides: Catalyst 4500 Series Switch SW Configuration Guide, Release IOS ...
I have also enabled Netflow in IOS 12.1/12.2 and figured the process was similar (It seems to be). CEF is enabled, and I have all the pre-reqs according to the document above, however, the flow commands don't exist, they simply say "command unrecognized". I have included my sh version below.
sh version (edited):
Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSAL-M), Version 03.01.01.SG RELEASE SOFTWARE (fc1)
[Code].....
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Mar 13, 2012
Any major difrrence between Netflow v/s Netflow-Lite?
I am trying to understand if Cisco 4948E can do the same job as Cisco 4500E or not and difference between Netflow v/s Netflow-Lite will work for me to select correct product.
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Sep 12, 2011
I would like to update the device package for Cat3750. The readme file from update package says that DtShare V1.10 (DtShare.cv50.v1-10.zip) has to be installed first. I have actually DtShare V1.9 installed but there is no DtShare V1.10.
When I execute the device update, than it downloads everytime the DtShare V1.9. My question to Cisco staff and all other CW specialists: How can I become the DtShare V1.10?
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Jul 4, 2012
I have a 3750 stack of 4 switches that was installed about 2 years ago. Recently I was doing some work on the switch and realized that I am unable to save the config. I amobviously concerned that if the power fails or the switch reboots I will be reconfiguring it and that is not something I am interested in doing! [code]
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Jun 5, 2012
I've just noticed an error I've never seen before in our switch logs. We have a stack of 6 Cat3750G-48TS-E switches. The first two in the stack have been up for just over a year and I've only just noticed this error. Thus far, I haven't noticed any symptoms - I just stumbled upon this error while checking for something else.
As far as I can tell, this has only popped up once and it was 2 days ago. Unfortunately, due to an incorrect firewall rule, our syslogs were not getting to our syslog server so I don't have any historical logs to check against, but it hasn't happened since.
The error I've seen is as follows:-
Jun 5 17:04:03.288: * ManagementInterfaceInitialized exception in port-asic 0 (N16FujitsuSwitch.com.au-2)
Jun 5 17:04:03.288: ***********************************************************
[Code].....
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Feb 22, 2012
I have encountered some weird issue on our Cat3750 running as DHCP Server.I have excluded 5 IP addresses only on the running configuration. [code]
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Dec 7, 2010
I've got older SOHO97 which I want to use as a backup for Cisco 800 but I can not find any information if it actually supports IPv6. Neither the data sheet [URL] nor the Cisco Feature Navigator [URL] suggest it has any IPv6 support at all.
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Aug 22, 2011
Because ASA5585X doesn't support CSC module, how can do URL filtering on ASA5585X
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Nov 11, 2012
I am trying to update my F5D7234-4 G Wireless Router - Firmware and I am told No known program will open this file. This file is part of a program. What do I do?
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Apr 17, 2013
I have configured the netflow to gathering flow from my cisco 2800 as below:
interface GigabitEthernet0/0
description ### To VNPT_FTTH_20M ###
no ip address
ip flow egress
ip route-cache flow
[Code]...
But i still not see users addresses(each individual hosts will go though) What and where i am configured wrong? I also attached here the map network.
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Jan 8, 2013
configured the monitor and exporter on the wcs 5508 running 7.4.100.0 and it is not working.
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Mar 1, 2012
How NetFlow works when NAT is enabled in the Cisco Router? ...the translation of IP addresses is done before or after save the packets in the flow caches?
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Feb 5, 2013
I have an issue with Netflow that I have been unable to solve. I have an ASA5510 that is sending netflow data to a FogLight NMS and it works fine until I reboot the server. After the server is rebooted, the flows no longer are received until I reload the ASA. Once the ASA is rebooted, flows work fine. I can remove and reconfigure the netflow configuration on the ASA and that will start the netflow again, but that is painful.
Is there any way to easily stop/restart or re-initiate the netflow from the ASA easily?
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Apr 22, 2013
I see these errors on my 6500 router which acts as my server farm and has hundreds of servers connecting to it. I have just taken over these routers from another guy and think the errors may have been there for quiet awhile. I have another router which doen't seem to have these errors. Can you tell me how to turn off netflow? Will it cause any problems to my server farm? Is there a risk to the router if I disable something?
I ask this cause the server guys are having problems with certain servers. I am not sure if they are because of this or not. I really would like to clear the logs. [code]
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May 22, 2013
I was trying to get Netflow setup on one of my 7K VDCs and ran into a problem. While netflow data was reaching the collector, IP src/dst information was not appearing in the analyzer tool. I could not see any information about conversations. So I contacted the company that makes the collector/analyzer and the directed me to a blog on their site and told me to setup the 7K exactly as it is described in the blog post. I did and a bit later the ip src/dst address information appeared. So the only difference between the two configurations was that in the first case I tried to define a record and in the second case, no record was defined and instead the orginial-netflow parameter was used in the "flow monitor" section. [code]
I referenced the document "Cisco Nexus 7000 Series NX-OS System Management Configuration Guide,Release 6.x", Chapter 19 - Configuring NetFlow.It's clear to me that I didn't do something right in defining my own record since that's really the only difference between the config that worked vs the config that didn't. However, the documentation I referenced doesn't really provide useful information about how to create a record (above and beyond what I can already see by typing '?' at the CLI).
For example, the "match" command makes no sense to me. Usually when you have a match command it is accompanied by some sort of ACL. In the "flow record" section a match command would be something like "match ipv4 source address" but that's it. What does that mean? Match anything that has a IPv4 source address?? That doesn't make much sense. The collect commands are equally as bewildering. If I want to define my own record (and not use the original-netflow parameter) what do I need to do in the "flow record" sub-configuration to get Nexus to send ip src/dst information to the collector (which, I would think, is basic information to send - what good is netflow data without it)?
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Feb 7, 2010
I have a question regarding netflow and NAT. I have read some documentation (on ASR1000) regarding monitoring NAT process on Cisco ASR1000 that can be done using netflow version 9 (the term was called netflow event logging a.k.a NEL). The problem is, I have not found the netflow collector that can do that. I have queried several software such as manage engine "Netflow Analyzer" and Lancope, but they said their software can not do that.
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Jan 10, 2011
We have a 1841 router and would like to enable netflow. Will this degrade the router's CPU and memory performance.
1841>sh verCisco IOS Software, 1841 Software (C1841-IPBASE-M), Version 12.4(1c), RELEASE SOFTWARE (fc1)Technical Support: [URL] Copyright (c) 1986-2005 by Cisco Systems, Inc.Compiled Tue 25-Oct-05 17:10 by evmiller
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
1841 uptime is 1 day, 4 hours, 47 minutesSystem returned to ROM by power-onSystem restarted at 11:04:25 MYT Mon Jan 10 2011System image file is "flash:c1841-ipbase-mz.124-1c.bin"
Cisco 1841 (revision 7.0) with 114688K/16384K bytes of memory.Processor board ID FCZ113311Y62 FastEthernet interfacesDRAM configuration is 64 bits wide with parity disabled.191K bytes of NVRAM.31360K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
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Apr 5, 2012
I am trying to setup Netflow to identify a problem I am having with a video conferencing system. Here are the commands that I have entered into the 6509 I am working on. I have checked this against another 6509 I have and these match. Not able to get netflow to show up on the solarwinds server. I have configured it to accept the netflow source coming from the 6509 I am working on.
ip flow-export version 9
ip flow-export destination 1.1.1.1 2055
ip flow-export sourc vlan 254
[Code].....
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Dec 13, 2010
how I configure netflow on a cisco 877 router.
I have an interface e0/4 that is 172.1.1.1 on router one (network one) which links to another router (onnetwork two) which has an interface of e0/4 172.1.1.2 which allows two networks to communicate. Network one is 192.168.0.0 /24 and network two is 10.255.255.0 /24.
How do i configure netflow to monitor the traffic going through these interfaces?
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Jan 12, 2011
I have a WS-C3560X-24P with this SW version 12.2(55)SE1. It has several L3 Vlan interfaces.How do I enable it to send Netflow traps?It does not support the ip flow-export commands.
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Apr 19, 2012
I have a 7200 router with a 12.2.(46a) IOS and I am trying to activate Netflow on a subinterface. From the documentation of Cisco, I should be able to do it since the ios 12.2.(14)S but the command is unavailable.
[URL]
I have tried also to enter the command in the subinterface directly but it doesn't recognize it.
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