Cisco Switching/Routing :: BOOTP Client Request Is Not Broadcasted Out Cat3750X Stack
Dec 15, 2011
I have a situation where a specific unit on my network is booting using BOOTP.The unit is connected to a stack of two Cat3750X switches running IOS 12.2(55)SE1. The server and client is on the same VLAN on the same physical switch, so it is purely L2 between the server and client. The BOOTP server is a computer running a specific software connected to the switch. There is no DHCP server on the switch. IP-helper is not configured on the switch.
If I do a monitor-session on the client port I can see the BOOTP request packet enter the switch, however this packet is never flooded out of any ports in the switch, so the BOOTP server never receives the request. I have tested the server and client in a cheap dumb switch and there it is working just fine. Regular DHCP requests are flooded correctly.It apprs the there is something in the clients BOOTP request that is not correct, since the Cisco switch apparently discards the packet.
Are there any BOOTP gurus that can have a look on the attached (Wireshark) BOOTP client request and perhaps determine if it is infact malformed? Why the switch is not flooding the packet. What is the meaning of the BOOTP broadcast flag in a client boot request?
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Jul 26, 2011
I am trying to use Ciscoworks LMS3.2 with RME 4.3.1. to upgrade many, many Cat3750x stacks we have laying around. The problem I am having is that Ciscoworks downloads the new image to the Stack’s master switch only and not to all switches. When I reload the stack after the download, any switch could become the master. I already set up the priority to always have the same master, but the process is unreliable and more than once I ended up with another switch as a master. In any case if the master is not the switch with the new image, the stack will keep the old image as their running image and the switch with the newer image has problems joining the stack (after a while it downgrades and become stable)I know how to do it manually, but I was hoping Ciscoworks would be able to do this for me. It would make my life much easier.
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Jan 25, 2013
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops across multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO). As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers.
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Feb 18, 2013
There are two kinds of time for assinging IPv6 address from DHCP server.Actaully Catalyst 3750X can do this role. however I am not sure about the difference between Valid lifetime and preferred lifetime.In my understanding the valide lifetime is total lifetime for using the assigned IPv6 address but the prefered lifetime when the assinged IPv6 address is expired at the prefered lifetime then the device may generate extended request or something right?
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Jul 4, 2012
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops accross multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO).
As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.
However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers:
Port-channel6 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 1cdf.0f82.1607 (bia 1cdf.0f82.1607)
Description: EC to xxxx
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
[Code]...
How I can attempt to identify what traffic is being dropped?
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Feb 27, 2013
Is there a stacking cable that is "bent"?Im using this cable:"CAB-STACK-50CM", "Cisco StackWise 50CM Stacking Cable".But it takes up to much room in the back of the switch, is there such a thing as "bent" stacking cable.
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Oct 31, 2012
I have 3 switches in my 3750 X stack. I am getting the following error in the logs: %PLATFORM_STACKPOWER-4-PRIO_CONFLICT: Switch 1's power stack has conflicting power priorities. Not sure what I should do next. Below is my Stack-power configuration:
Power stack name: Powerstack-1 Stack mode: Power sharing Stack topology: Ring Switch 1: Power budget: 735 Low port priority value: 20 High port priority value: 10 Switch priority value: 2 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: c464.1308.7900 Neighbor on port 2: e8b7.4827.e680
Switch 3: Power budget: 729 Low port priority value: 22 High port priority value: 13 Switch priority value: 4 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd9.9f00 Neighbor on port 2: 2894.0fd8.e200
Switch 2: Power budget: 690 Low port priority value: 21 High port priority value: 12 Switch priority value: 3 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd8.e200 Neighbor on port 2: c464.1308.7900
Each switch has its own 715W power supply in it and all check out OK.
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Sep 24, 2012
A site that i am responsible for has the following equipment installed:
2 x 3750G Switches configured as a stack using Stackwise - Collapsed Core/Distribution Layer
5 x 2960G Switches as Access Layer switches
WAN connections into the Core/Distribution Layer are all Gigabit Ethernet over Fibre.This is a dedicated CCTV Network with 50 Cameras all streaming video into the Core (decoders connected to access switches)Each 2960G has 2 links to the Core/Distribution 3750G Switches, 1 to each switch - Gigabit.I'm running rapid-pvst on all switches, so spanning tree is blocking one of the ports and effectively halving the 2 gig bandwidth. Next year our customer is going to add in a further 50 - 60 cameras.After monitoring the current loading on the ports in use, we have suggested to the customer that the 2 connections to each should be Ether-channeled together. [code]
First interface takes commands no problem, keep getting the message that etherchannel cannot be configured across different switches in a stack when i try to put the second interface commands on.
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Feb 7, 2012
I have Nexus 5548UP, Version version 5.0(3)N2(2b), with a flat configured network. Customer has put several IP subnets on one Vlan. In one subnet is an Siemens SPS wich connects to a Server. This SPS is not reachable since I send a ping from the N5k, then everything works fine. Sniffering that port no arp requests from the N5k are captured. That hapens with every device (Siemens SPS) in the network. Every other clients and server are working fine and there are no problems.
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Nov 20, 2012
Nexus Core switch 7K Gives arp request for his own Local IP address continuously. This Logs keeps on coming for the past 2 months.
The Ip Address 10.80.18.1 is an secondary IP address of vlan 18 , which is used for Teleprescence.
interface Vlan18 no shutdown no ip redirects ip address 10.80.18.252/24 hsrp version 2 hsrp 18 preempt priority 110 timers 1 3 ip 10.80.18.1 secondary ip 10.80.18.254
2012 Nov 12 18:22:06 FRMA_BK1_CSN7K_01-COR %ARP-3-REQ_IP: arp [3829] Sending A
RP request for local IP address 10.80.18.1 on Vlan18, request from pid: 3834
2012 Nov 12 18:22:07 FRMA_BK1_CSN7K_01-COR %ARP-3-INVAL_HDR: arp [3829] Found
[code]....
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Dec 4, 2012
I'm trying to do some basic troubleshooting on our WiSMS. Some clients on a working network are unable to connect in the afternoons, debugging the client on the wism shows this message:
*apfMsConnTask_2: Dec 05 14:23:44.018: Association request from the P2P Client Process P2P Ie and Upadte CB
It keeps repeating with the Task_X changing.What does that mean?We have two controllers in our 6500's running this software ver. 7.3.101.0
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Apr 30, 2013
I'm using the cisco 837 router as my VPN server. I get connected using Cisco VPN Client Version 5. But when I ping the router ip, i get request timed out. Here is my configuration :
Building configuration...
Current configuration : 3704 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
[Code]...
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May 6, 2013
can you stack a 3750 switch over fiber.....the answer is no, but the virtual switching supervisor 720-10G for the 6500 can create one virtual switch using two 6500s...
how can we get cisco to come up with a way for access switches to be stacked over fiber similar to above supervisor? i know of few of my site that would benefit from this...maybe they can come up with a vss appliance, similar to a media converter, to convert stackwise over fiber...then of course, you would need the same appliance on the other end....
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Feb 22, 2013
Version 12.2(33)SXI
int vlan 1
description client vlan
ip vrf forwarding A
ip address 10.1.1.1 255.255.255.0
standby 129 ip 10.1.1.2
standby 129 timers 1 4
standby 129 priority 105
standby 129 preempt
ip helper-address 10.1.2.20
[code]....
dhcp requests are not making it to the dhcp server SAME VRF (ip helper-addres is not doing anything.....)extended vrf traceroutes on udp 67 sourced from vlan2 are fine
I am expecting udp unicast packets on port 67 "giaddr" relay packets on the DHCP server generated and sourced by the relay on Vlan1
eg. Mar 1 01:59:06.731: DHCPD: setting giaddr to 10.1.1.1
This exact setup works in our preprod environment with the same code.Only difference is we run Distributed etherchannel on the 6500's where this doesnt work.
Wireshark on the client I can see the requests being sent Going to check it with debug ip dhcp server to check the relay logs out of production hours.
I have seen so many people say it IS and ISN'T supported on this version of the code.e.g. [URL]
I am aware the helper-adddress should inherit the vrf of the interface ip helper-address vrf command is not supported.The fact it works in the PP environment.... could this be due to the Distributed EtherChanel difference? or just some bug....
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Feb 21, 2011
We find ourselves in a difficult situation with the Cisco VPN Client version 5.0.07.0290 where it keeps giving us an
"Error 42: Unable to create certificate enrollment request"
When we attempt to use the Online enrollment method to create and enroll a new certificate. There is no additional information in the VPN client logs where we have set 3-High for all logs. In addition, Wire shark does not show any packets sent from the machine running the client to the Cisco 3825 router which runs the Cisco CA.
To create and enroll a certificate we do the following:
1. Click on the Enroll button to show the Certificate Enrollment dialog
2. Select Online
3. Select <New> for Certificate Authority
4. Enter http://192.168.120.1 as CA URL (note, 192.168.120.1 is the IP of the Cisco 3825)
5. Click Next to display the dialog where we can enter certificate details
6. Enter details in all fields except IP Address and Domain
7. Click Enroll which shows a dialog with the Error 42 ... message in it.
If we attempt to create a request by using the File method, all works fine, that is, the client creates a file with the enrollment request. The fact that the client does not send any messages to the Cisco CA leads us to believe that we have a problem on the client machine. However, the client does not write any information in the logs, so it is a bit hard to fix the problem. I can provide additional configuration information if required for both the client and the Cisco CA. Note that we have not modified any client configuration. Basically, we installed the client on a Windows 7 64bit machine and attempted the steps listed above.
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Mar 21, 2012
I got Two Distribution Switches of Cisco 3750G. Each Distribution have two 3750G switches stacked. I also have one Cisco 3750V2 Access Switch connected to both Distribution. When I am checking for redundancy, I can only get redundancy test pass for one link not atall for other. If I have a link up with Distribution 1 only then its fine; but disappointment with Distribution 2 link. I can see that the switch priorities of Dist 2 is not correct ie. Master's priority is 10 and Member's is 15.
My question is that due to misconfigured priorities on Distribution 2 stack switches I am failing with redundancy if ONLY Dist 2 is up and Dist 1 is down.
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Mar 18, 2003
I have a Cisco 7200 acting as the DHCP relay agent on my network. From a security standpoint, I want to disable the bootp server, with 'no ip bootp server'. What bearing, if any, does 'no ip bootp server' have on DHCP activity?
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Oct 28, 2012
Here at work i am using 2 Cisco 1100 series Aironet (811G) (intalled in august 2005)
Product informations :
AIR-AP1121G-E-K9 Top Assembly Serial Number:FCZ0921V07A System Software Filename:c1100-k9w7-tar.123-4.JA System Software Version:12.3(4)JA Bootloader Version:12.3(2)JA3
All I-phones 4S OS6 are kind of loosing connection, if i am using google i will be able to use it once but never twices, the second time google will always time out, but the users are still able to receive and send their emails so the connection is still up.
On the manager i can see every Iphone, and everything seems to be ok, the "secutrity" is a simple 128bits wep key and i have a macadress filter activated and finally the SSID is not broadcasted.
The iphones are working smoothly with any modern wifi.So my questions are, is it a firmware problem? a configuration problem? or it is time to upgrade the hardware?
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May 7, 2013
I'm trying to review a QoS setup, and I'd like to make sure I fully understand the current setup before I change anything. I'm seeing output drops on two different queue-thresholds, but not sure how packets are making it to one of the queues.
Switch Version
CORE#show ver
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE, RELEASE SOFTWARE (fc1)
System image file is "flash:/c3750e-universalk9-mz.150-2.SE/c3750e-universalk9-mz.150-2.SE.bin"
cisco WS-C3750X-24 (PowerPC405) processor (revision A0) with 262144K bytes of memory.
Switch Ports Model SW Version(code)
I can find queue4-threshold3 in the mappings, but how are packets getting mapped to queue2-threshold1? The priority queue is disabled for this interface, so I'm not sure how this queue is dropping packets, according to the maps nothing is mapped to 02-01.
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Dec 6, 2011
I have two 3750s stacked and one 3750 standalone all in one data closet. The both have the same versions. I want to combine them to make one stack. How do I force the standalone to be the master? sw 1 priority XX(Higher then the existing stack)? Both the stack and the standalone have management addresses. Would it be ok to delete the stack ip address? That way, the standalone(master's address will be the only management address)?How should I connect the standalone 3750 to the stack? At present, the 3750 stack is connected via a cascade cable going from the stack 1 port of the top switch to the stack 2 port of the bottom switch.
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Mar 7, 2013
This 3750X stack (3 members) has some 100% cpu spikes. Is this bad enough to start tracking down the cause(s) or is this somewhat typical and not a reason for concern? I just took this reading. How can you detemine when the 100% and 80% spikes occurred?
2222233333333332222222222444442222222223333322222222222222
7777733333333338888888888000007777777770000077777888887777
100
[Code].....
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Jan 31, 2012
I recently created a stack using (2) 3750x switches. I have three vlans on the stack (1,105,241) Vlan 105 is configured on 6509 core switches with multicasting and are connected to the stack via gigabit fiber. It is working well with clients on the Master or SW1, however clients on SW2 do not participate in multicasting Any client pc that is connected to SW2 vlan 105 does not show up in the "sh ip igmp snooping group" command. I can statically assign a client on SW2 to the mcast groups but but they fail to register on their own. I can take the cable connection from SW2 and plug it into an SW1 Vlan 105 port and it immediately becomes a member of the groups. I can then connect it back to the SW2 port and it disappears from the group membership. IGMP and PIM are configured with the defaults.
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Nov 13, 2011
Can I get a stack cable longer then 3m?
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May 26, 2011
I have a 3750G and bought a new 3750X. It possible to stack these two together?
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May 15, 2013
I would like to know how to stack 2 switch cisco 3550 that IOS C3550-ipservicesk9-mz.122-44.SE6
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May 19, 2013
I have a stack of 4 3750 Switches.
1. WS-C3750G-12S
2. WS-C3750G-12S
3. WS-C3750X-48P
4. WS-C3750X-48P
The stack cable connected to Switch 1 Port 1 and Switch 4 Port 2 will not come back online. The logs show that there was a Stack line change. I have replaced the 1 meter Stack cable from Switch 1 to Switch 4 three times and it still does not come back online. This is the part that is interesting.. I have disconnected Port 1 Switch 4 and connected it to Port 2 Switch 4 and then Switch 4 came back online. This made me think Port 2 on Switch 4 was working correctly. Then I disconnected Port 2 Switch 1 and connected it to Port 1 Switch 1 and then Switch 1 came back online.
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Feb 20, 2013
i have two cisco 3750 in stack firts, master switch have all swports busy second have only 5 how can i see cpu utilizations of the second switch, and its reasonable to move somme devices from first switch to second for deacreases of cpu and memory utilisatio ns of the master? the stack tehnologies use both cpu as one? or its only for simple management ?
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Mar 11, 2013
have a cable i think is bad, is it possiable to switch the cable out without causing any downtime to the switch or connected devices?
HQ-1st-Flr-Stack#show switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
[Code].....
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Apr 29, 2012
I just need a little refreshing on upgrading a stack of 3750's. This stack only has 2 switches: [code]
1.) If I remember correctly I simply tftp the IOS to the flash of each switch and then reload the master only?
2.) Can I safely assume these are the 2 flash locations:
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Jun 21, 2012
i want to remove an access layer 3750 48 POE master switch and replace with a new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...
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Mar 11, 2013
I would like if is possible to stack a Cisco 4900M with a 2960S. I know it is not the most common situation but i need it.
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Mar 15, 2012
I have been given 2 3750 switches and need to put a config onto it wuld is for 2 3750's in a stack, how should I put this on the 2 switches? Is it bested to install it onto 1 switch first then physically attach the 2nd after?
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Jan 29, 2013
I have a 3750G switch that can't detect another switch or be detected through its stack ports. I tried the recommended test; looping a cable between the ports and rebooting. I get the following message as the switch boots: SM: Detected stack cables at PORT1 PORT2. However, if I connnect another switch, it won't detect it and can't form a stack.
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