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DHCP Snooping issue with CISCO 4500

xafarali19901
Level 1
Level 1

Hello,

 We are facing an issue while configuring DHCP snooping.

We are configuring DHCP snooping on "Access SW" C2960X Software  (C2960X-UNIVERSALK9-M), Version 15.0(2), we have multiple VLANs in our network. And for some VLAN we

have configure DHCP on "Dist. SW"Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 03.04.00.SG RELEASE SOFTWARE (fc3) and for remaining VLANs we have configured 

DHCP on freeBSD.

When we enable DHCP snooping everything working fine for those vlans which are getting DHCP ip from freeBSD, but for vlans which have DHCP on Dist. SW client are unable to get IP.

VLAN2:    DHCP on freeBSD // working fine

VLAN3:    DHCP on Dist. SW // not working

VLAN4:    DHCP on freeBSD //working fine

Access-SW#sh ip dhcp snooping 

Switch DHCP snooping is enabled

DHCP snooping is configured on following VLANs:

2,3,4

DHCP snooping is operational on following VLANs:

2,3,4

DHCP snooping is configured on the following L3 Interfaces:

Insertion of option 82 is enabled

   circuit-id default format: vlan-mod-port

   remote-id: xxx.xxxx.xxxx (MAC)

Option 82 on untrusted port is not allowed

Verification of hwaddr field is enabled

Verification of giaddr field is enabled

DHCP snooping trust/rate is configured on the following Interfaces:

Interface                  Trusted    Allow option    Rate limit (pps)

-----------------------    -------    ------------    ----------------   

GigabitEthernet1/0/24      yes        yes             unlimited

VALN3 clients are unable to get DHCP IP. Only able ot get IP when we disable IP DHCP snooping

Can anyone help me to figure it out what is the issue.

snooping is only enable on Access SW.

Regards,