LAN was down ie Users are not getting ip from DHCP server after enabling DHCP snooping

Hi All ,
Enclosed file has network connectivity diagram.
1. L3 vlan's ie 2,3,4,5 and 6 are configured on ACC-CR1 and ACC-CR2.
2.Trunk is configured between Core switches ( CR1 and CR2) and access switches .VTP mode is transparent on all switches.L2 vlans are configured on all access switches.
3.DHCP is server is located at different location and is reachable over MPLS.
Without enabling dhcp snooping , users connected to access switches (Sw1,sw2,sw3 and Sw4 ) are getting ip address from DHCP server without any problem and everything is working fine.
But users connected to Sw3 and Sw4 are getting ip address from rouge DHCP server which is not pingable from any one of the switch.
So we have configured DHCP snooping for all vlan's on CR1 , CR2 , SW3 and SW4 and "trusted uplink ports" which are connected to WAN routers from CR1 and CR2 and also "trusted uplink ports " of Sw3 and Sw4 which are connected to CR1 and CR2.
As soon we have enabled DHCP snooping and trusted respective uplink ports , users are not getting ip address from remote DHCP server and even users connected to Sw1 and SW2 are facing same issue.
Note : DHCP snooping is not configured on SW1 and SW2.
Why users are not getting ip address from remote DHCP server as soon as we enabled dhcp snooping on Core switches and two access switches ie sw3 and sw4 ? what could have caused DHCP packets to be dropped ? Any idea would be appreciated .

Hi,
as you say: " HSRP is configured between CR1 and CR2 and Vlans are active on CR1" does it mean there are L3 intrefaces configured in each VLAN on your CR switches and ip hepler-address pointing to the remote DHCP server is configured on each of them?
I know it's difficult in a productive environment but IMHO you need to find out where are the DHCP offers dropped.
Either by enabling DHCP debugging or by capturing packets via Wireshark, e.g.
Best regards,
Milan

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access switch is connected to base switch and base switch is connected to DHCP server, however users are connected to access switch are not getting IP address. Hence i would like to know the solution from experts.
I remember there is a command in CATOS "set port host" by this way we can enhance port to get IP quickly..if there is any command similiar in IOS?
Your assistance will be highly appreciated.
Regards,
Khan.

Khan,
The problem of users not getting IP from the DHCP usually happens when 'spanning-tree portfast' is not enabled on access ports. PCs don't wait long enough for DHCP responses and time out.
Can you make sure all the access ports, to which the users are connected to, have spanning tree portfast enabled.
HTH,
Sundar

My messages are not being deleted from the server

Hi,
Mail is not removing messages from the server. Every now and than I have to remove messages from my server manually. I went through all the settings ... it works as intended on 2 out of 3 machines ... am I missing something? I can use "delete now" in Mail preferences ... not a big deal, just a nuisance.
Thanks, Stephan

Are the Mail settings sticking between reboots on that one Mac?

Users not getting IP from QIP server

Dear Friends,
Need your advice on this issue.
Users of our new site complained of not getting IP dynamically from DHCP server. Static IPs works fine.
The LAN interface of the router is configured with helper IP address of QIP servers.
On the router there exists a DHCP pool configuration, later we removed this config understanding the helper address will
assign the ip address dynamically.
QIP which serves as DHCP is confgured to assign the IPs, but the users complined of not getting IPs including IP phones.
Kindly advice what could be possible chances of this issue.
Thanks in advance
rYs

You cant have both the ip helper-address and a DHCP pool configured on the router. Basically what happens is the client DHCPDISCOVER will pick the first DHCP server that answers it and in this case its the the router. If you want to pass traffic all the way to the DHCP server, you need to disable the DHCP server on the router and leave only the ip helper-address configured so it can relay the broadcast to the defined DHCP server.
It sounds like you have this current topology for your DHCP server that is working:
Client ------------>DHCPDISCOVER ---> Router(DHCP Server)
 <------------DHCPOFFER
 ------------>DHCPREQUEST
 <------------DHCPACK
You want to configure your QIP DHCP Server to respond to DHCPDISCOVER, you will need to remove the DHCP pool from the router and add "ip helper-address x.x.x.x" where x.x.x.x is your DHCP server ip.
If that still does not work, you will need to check the configuration on your DHCP server to ensure its not mis-configured. QIP is not a cisco product but you should be able to view debugs on that application to identify if the DHCP server is sending an offer or dropping the request. Most likely your scopes are mis-configured on the server.

User Exit not getting Triggered in Quality Server

Hi,
In FM 'IDOC_INPUT_DESADV' Iam using an User Exit 'EXIT_SAPLEINM_006' ,
which is getting triggered in Development server.But when I moved it to Quality,
The User Exit is not getting triggered.Thou the Exit is assigned to Enhancement
and that in turn is assigned to Project, still the problem persists.
Can any one suggest me what could be the problem.
Regards,
Kiran B.

Kiran,
Check the Project of that enhancement is active or not. not the enhancement.
<REMOVED BY MODERATOR>
Satish
Message was edited by:
Alvaro Tejada Galindo

LAN was down ie Users are not getting ip from DHCP server after enabling DHCP snooping

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