Cisco Switching/Routing :: DHCP Snooping On 6506

Mar 2, 2013

I have a problem with high CPU load by DHCP Snooping process on Catalyst 6506 (WS-SUP720-3B, soft: s72033-ipservices_wan-mz.122-18.SXF11.bin). I have it enabled on 15 VLANS, in which there are subscriber devices residing, and sending DHCP requests through Cisco to DHCP server (Cisco acts as DHCP relay, and it's collecting the snooping database, I also use DAI).
 
Snooping database contains 6962 bindings now.
 
CPU load goes high only sometimes, and I don't have a clue, why it's going so high. It can load as high as 45-47% of CPU, like this:

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
116    81471244 322596368        252 42.95% 43.48% 36.06%   0 DHCP Snooping 

When the load is high, the command: show ip dhcp snooping statistics is showing, that the overall quantity of
Packets Processed by DHCP Snooping is increasing rapidly. In normal situations, it's like 10-20 packets per second, but when the load is high, it's 1000-10000 pps.
 
But when I look at SPAN from my subscriber's VLANS, I don't really see any flood of DHCP requests, or something like that - everything looks as usual. Maybe, some of subscriber's devices are sending incorrect DHCP requests, that are causing packets to loop inside RP, or something like that? How can I detect that thing?
 
Also I thought, that if I enable the ip dhcp snooping trust mode on all of the Catalyst interfaces, the DHCP snooping will not process the subscribers DHCP packets, and I can, by exclusion of interfaces from one to one, detect, from which interface the problem is originating. But this seems to be incorrect, I turned the ip dhcsp snooping trust on all interfaces, and I still get spikes of CPU load by DHCP snooping process. Why it's still examining packets, even on trusted interfaces, is it ok?
 
And one more question - if I disable the ip dhcp snooping globally, will it clear all my existing bindings in snooping database?

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Cisco Switching/Routing :: ME 3400 - DHCP Snooping

Sep 27, 2012

I have a problem at a place where 5 ME3400 switches are connected in a straight line. I can't do much about the topology of that place, but the problem is they are all DHCP Snooping, but uni cast replies from the dhcp server further up the hierarchy gets eaten by the first switch! I can't really see why it not only inspects in and whines about it not being for itself - it then drops the message.
 
What have we done wrong (apart from the actual layout of that place, which I can't really change)?
 
Sep 28 13:49:29: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/1)
Sep 28 13:49:29: DHCP_SNOOPING: process new DHCP packet, message type: DHCPOFFER, input interface: Gi0/1, MAC da: 7444.012d.debd, MAC sa: 0013.1a4a.65c7, IP da: XX.YY.186.7, IP sa: XX.YY.186.1, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: XX.YY.186.7, DHCP siaddr: 0.0.0.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 7444.012d.debd
Sep 28 13:49:29: DHCP_SNOOPING: binary dump of option 82, length: 20 data:
[Code] ......
 
It really should just send it on, as with any uni cast not on the switch itself - it should go out Gi0/2 really. Why isn't it?
 
[core] -- [sw1] -- [sw2] -- [sw3] -- [sw4] -- [sw5]
 
All the trunks are trusted, DAI is on (I've tried shutting it off, as well), port-security is used but it's actually not dying on the switch having the client computer, but the first one in the chain with dhcp snooping. 

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Cisco Switching/Routing :: 3560 Implement DHCP Snooping

Oct 12, 2011

I have attempted to implement DHCP snooping and have been having some strange issues. I have 5 3560s taht I use for my edge and when I attempt to implement on all five, the VLAN that houses my voice data appears to no longer be able to recieve DHCP lease renewals so after the 24 expiration all of my phones lose their configs. Once I roll back the changes the voice VLAN comes back. The other VLANs seem to function correctly as theya re able to renew their DHCP addresses.
 
The 3560s tie into each other using GIG Ports 1 & 2 and the top and bottom switches tie into our core switch, a 4507. The config that I use is below, failry simple and straightforward.

4 of the 5 switches feed our general office vlans for voice and data however the 5th switch is there for expansion and not in use. As such I have left the config changes in place on it and have tied myself and a colleague into it and have been operating fine for over a week now. So the config that I use seems sound in theory and should work on the other 4 switches with no issue.

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Apr 9, 2012

I am working in a environment that is classed as collapssed Layer 3 environment.  We have a core 6500 with routed links to 3560's which are access switches.
 
We have layer 3 vlans on the access switches, one for data one for voice.On the layer 3 vlans we have ip helper addresses that are used for DHCP.  The DHCP servers are located on the 6500.
 
I recently had a incident where someone plugged a netgear router into a desk point because they thought they could use it for a switch.  This router then started to dish out IP addresses to people in the morning for those who came in and docked their laptops.  99% of people weren't affected because they have desktop PC's are their leases hadn't expired.
 
Now we have bpduguard, bpdufilter to prevent people from plugging in switches that send out BPDU's.  However this doesn't prevent the above senario where someone plugs a router or a 'dumb' switch that doesn't send BPDU's.Because of the above senario I started looking at DHCP Snooping, but I am unsure on a couple of things.
 
With the topology of our network I understand that I don't need to configure IP DHCP Snooping Trust on the L3 uplinks to our core switch.  From what I understand I just need to enable IP DHCP Snooping globaly and then on the VLAN's on the access switch (because of the L3 topology VLAN's are local to the access switches).  Only if I had L2 uplinks to the core would I need to configure IP DHCP Snooping Trust on the trunk links.

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Jan 18, 2013

I am trying to understand the basics of DHCP snooping.  I have a just a 3560 switch and a laptop ( to get a DHCP address) and my DSL router which has a DHCP server running.  On the switch I have enabled "IP DHCP Snooping" and "IP DHCP Snooping VLAN 1" plugged the laptop and DSL router in and the laptop gets and IP address, should it? 

I thought all ports were untrusted by default so the DHCP server should be blocked at offering IP addresses? If I wanted the DHCP server to be allowed to offer IP's I thought I should need to trust the port.

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Cisco Switching/Routing :: Dhcp Snooping Without Effect In Catalyst 2960-PST-S

Apr 17, 2012

I have a new catalyst 2960,and i want to enable DHCP SNOOPING,but,it doesn't work,the server is stilling offert addresses IP and it's not connected  in a trusted port,the schema is very simple:1 switch catalyst 2960 PST-S,1 server dhcp and 1 pc client,the PC and the server are in VLAN 10,DHCP SNOOPING is enabled in all ports and no port is trusted,but the client get addresse IP after retyping ipconfig /release  and ipconfig /renew in dos commande.the configuration and the version of the switch are in the file attached.I tested the same configuration in a catalyst C3560-24PS and DHCP SNOOPING work normally,i tested in other catalyst 2960-PST-S,but the same probléme:DHCP SNOOPING without effect,the commands typed is:

-ip dhcp snnoping

-ip dhcp snooping vlan 10

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Nov 24, 2011

I got some problem with  enabling dhcp snooping on 4500 (cat4500e-lanbasek9-mz.122-54.SG.bin) the topology is as below: dhcp snooping enabled only on CORE (with interface trusted to dhcp server)the problem is that I put these 2 commands

ip dhcp snooping
ip dhcp snooping vlan 1
 
but it is not enabled on any vlan
  
SW-CORE#sh ip dhcp snooping
Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
none
DHCP snooping is operational on following VLANs:

[Code]...
 
On B1 if I turn it on there is a "1" in the section " DHCP snooping is configured on following VLANs:" but on core no.As you can see I did put the trusted on the interface in the direction to the dhcp.First I thought it can be a problem with option 82, I've read a lot about the issues with that, but the problem would be explicable if the client did receive IP address, but it does.

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Nov 14, 2012

I am trying to find a command for dhcp snooping rate-limiting on a CatOS. The PFC card is PFC. PFC3B is said to support that command. But there seems no this command.
 
-6k> (enable) sh ver
   
WS-C6509-E Software, Version NmpSW: 8.4(5)
Copyright (c) 1995-2005 by Cisco Systems
NMP S/W compiled on Aug  3 2005, 13:26:46
 
[Code] ......
 
Up time is 1183 days, 1 hour, 41 minutes

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Jan 9, 2013

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Feb 10, 2011

Just spoke to the TAC and didn't get the information needed.  When configuring ip dhcp snooping database I am adding this to my configuration:ip dhcp snooping database scp://dhcpsec@192.168.1.50/home/dhcpsec/switch1.dhcp.database.txt..I assumed that to do this I would either specify the password on the command line, similar to the way its done when using ftp/http, or that I would need to create a public/private key.I have enabled scp and can manually copy a file from the switch to the linux server. So I believe I have all the aaa commands correct. Cisco WS-C3560G-24PS System image file is "flash:/c3560-ipservicesk9-mz.122-55.SE.bin".

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Feb 14, 2012

does Cisco 2600 series switch support 802.1x and DHCP snooping?

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Oct 8, 2012

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Sep 24, 2012

we've an infrastructure were the Access is based on Cat3750G Stacks connected to both Cores using L3 connections.On the Access Switches are implemented the following features DHCP Snooping, IP Source Guard and Dynamic ARP Inspection and all is working fine since years...the DHCP Servers are on a dedicated stack which act as a SFarm.
 
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May 7, 2013

I have a problem with DHCP. I have two 2960 connected with a port channel on ports 47 and 48 as trunk with native vlan 10. I only have this one vlan. In port 1 of sw 1, I have a C800 as DHCP server.
 
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figure out why I’m not getting IP by DHCP when I connect the AP to the SW 2.The only I notice is that when I connect the AP to sw 2, I get on SW 1 the message of packet drop by option 82, but even after configuring ip dhcp snooping information option allow-untrusted on both switches, the problem persists.

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Sep 14, 2010

I've configured ip dhcp snooping on several vlans I want to monitor and the binding table doesn't seem to be building.eature DHCP is on, global ip dhcp snooping is enabled, VLAN snooping is enabled on the vlan's I want to monitor and my trusted interfaces are also configured. Alas no binding entries in the table! 7K is running 4.2(6).

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Sep 3, 2012

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Sep 25, 2012

I need to apply DHCP snooping on 4500 series switches working as L2 in my Network. We have external DHCL Server in another location connected with 6500 series switch.   
 
Running EIGRP                                                      Configured Voice & Data Vlan both
DHCP Server -------- 6509 switch<----------------------------------->6509 Switch -------- 4500 switch ----------------------------------------------------------Ip Phones.               
(ving Redundant)                                  (ving Redundant)   
 
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router(config)# ip p?
port-map    prefix-list
router(config)#

[Code]....

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Oct 10, 2012

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or are these features just available on the bigger modular switches (4500 and 6500)?
 
>sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA8a, RELEASE SOFTWARE (fc1)

[Code].....

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Nov 28, 2012

how to configure igmp snooping on a 3560.
 
I have a pure L2 switching network and 2 hosts on the same vlan that want to communicate a protocol between each other using multicast packets.
 
I wanted to configure ip snooping only on this vlan and create a multicast group limited to only these 2 host ir order to make sure that the multicast traffic is only between both of them.
 
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This is basically the network:
 
HOST_A---|SWITCH_A|==|SWITCH_B|---HOST_B

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Oct 10, 2012

In the following topology
 
R1(f0/0)------------(f0/1)SW1(f0/2)------------R2
  
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I configured SW1 for igmp snooping:
 
ip igmp snooping
ip igmp snooping vlan 1
  
Basically, I can see 'snooped' muticast group (via IGMP reports sent by R1)
 
SW1#sh ip igmp snooping group
Vlan      Group             Type        Version     Port List
----------------------------------------------------------------
1         224.0.1.40        igmp        v2          Fa0/2
1         239.10.10.10      igmp        v2          Fa0/1, Fa0/2
SW1#
SW1#
SW1#

[code]....

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Jul 24, 2012

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Jan 7, 2012

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Model number: WS-C2950-24
 
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Model number: WS-C2950-24
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Mar 8, 2013

I am configuring multicast in a environment where I have a 4506 at each site (4 total) and a 6506 as the core. Each 4506 is connected via layer 3 to the 6506. I have a mix of 3560s, 3548s, and 2960s connected to the 4506s and the 6506 via layer 2 trunk
 
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->3560
|
6506 --> 4506 --> 3548
|   |
|    --> 2960
|
4506 --> 2960
|
-->3548
 
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#1 - Is it correct to us sparse-dense mode in this configuration?
 
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Nov 29, 2012

I have a Cat6506.  There were 2 Sup 720 in it for redundancy.  They told me they had problems with this thing in the past needing to go out and reboot the machine.  I need to go out periodically because it goes into ROMMON.  I type boot and it comes back up.  One time though neither one would reboot.  I had to take a third one out there and reconfigure it.  Now it is starting to do the same thing.  One thing I did notice is they never connected it to an UPS.  It is plugged strait into the wall with power going to two outlets.  I am beginning to think there are spikes in the power occurring and this is sending it into ROMMON. 

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connection vss two 6506 which is the conector or speed (10g or1g) Sfp or x2 What is the connection that allows vss

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I realize the commands may be a little off, I don't have a switch nearby. When I get on our 3750 there are no issues, it allows you to apply the ACL the conventional way. I just can't seem to find any way to apply an ACL on an interface on the 6506 though.

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I've got a pair of Nexus 7010's running vPC. I am having a Multicast issue with a cluster of Linux servers that need to talk Multicast for cluster/high-availability operation. All the servers need to talk to a single multicast address and I am having trouble getting them to communicate. I believe I need to enable IP IGMP Snooping Querier on the N7K's and it needs to be enabled on the VLAN where the servers reside. How to enable IP IGMP Snooping Querier on a VLAN ?

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We purchased two new 4948 with two 10GE uplink ports and upgraded the devices to run IOS 15.  My 6506 is running Sup 720 with s77233-adventerprisek0_wan-mz.122-33.SXI9.  Currently we have 4948's connected to the same 6506's with no problems.  Today I tried to add the new switches with new IOS and it caused of  of my 6506 core switches to failover.  I can't explain why because it was close to start of business and couldn't do much troubleshooting.

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We have to get this working and have no test environment to work with.  We need to do this late this evening after close of business.
 
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