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Beginner

DHCP snooping clients not getting IP address

Hi,

I have got two access switches where almost 50 PCs connected. I have enabled DHCP snooping on those switches.

Once I enabled DHCP snooping on those switches existing clients works fine but If I plug a new device it is unable to get an IP Address assigned.

I have enabled IP DHCP snooping, IP DHCP snooping vlan 3 (Data VLAN) where clients and DHCP server resides.

I have also enabled DHCP snoop trust option on the trunk interfaces and DHCP snoop with rate limit of 3 is applied on all client intefaces.

The DHCP server resides on VLAN 3 (same as the clients) but on the other switch where I haven't enabled DHCP snooping yet.

While I try to debug, I get following messgaes on switch... (client trying to get Ip has the mac address sa: 0024.e8b4.ec05 )

018764: Nov 8 05:03:18.000 UTC: DHCP_SNOOPING: process new DHCP packet, message type: DHCPDISCOVER, input interface: Gi0/2, MAC da: ffff.ffff.ffff, MAC sa: 0024.e8b4.ec05, IP da: 255.255.255.255, IP sa: 0.0.0.0, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 0.0.0.0, DHCP siaddr: 0.0.0.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 0024.e8b4.ec05

018765: Nov 8 05:03:18.000 UTC: DHCP_SNOOPING_SW: bridge packet get invalid mat entry: FFFF.FFFF.FFFF, packet is flooded to ingress VLAN: (3)

018766: Nov 8 05:03:18.000 UTC: DHCP_SNOOPING: invalid DHCP options - unable to parse

018767: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018768: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak. Was Gi0/2

018769: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018770: Nov 8 05:03:22.522 UTC: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/2)

018771: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018772: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak. Was Gi0/2

018773: Nov 8 05:03:22.522 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018774: Nov 8 05:03:22.522 UTC: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/2)

018775: Nov 8 05:03:22.522 UTC: DHCP_SNOOPING: process new DHCP packet, message type: DHCPDISCOVER, input interface: Gi0/2, MAC da: ffff.ffff.ffff, MAC sa: 0024.e8b4.ec05, IP da: 255.255.255.255, IP sa: 0.0.0.0, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 0.0.0.0, DHCP siaddr: 0.0.0.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 0024.e8b4.ec05

018776: Nov 8 05:03:22.522 UTC: DHCP_SNOOPING_SW: bridge packet get invalid mat entry: FFFF.FFFF.FFFF, packet is flooded to ingress VLAN: (3)

018777: Nov 8 05:03:22.522 UTC: DHCP_SNOOPING: invalid DHCP options - unable to parse

018778: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018779: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak. Was Gi0/2

018780: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018781: Nov 8 05:03:29.417 UTC: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/2)

018782: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018783: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak. Was Gi0/2

018784: Nov 8 05:03:29.417 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018785: Nov 8 05:03:29.417 UTC: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/2)

018786: Nov 8 05:03:29.417 UTC: DHCP_SNOOPING: process new DHCP packet, message type: DHCPDISCOVER, input interface: Gi0/2, MAC da: ffff.ffff.ffff, MAC sa: 0024.e8b4.ec05, IP da: 255.255.255.255, IP sa: 0.0.0.0, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 0.0.0.0, DHCP siaddr: 0.0.0.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 0024.e8b4.ec05

018787: Nov 8 05:03:29.417 UTC: DHCP_SNOOPING_SW: bridge packet get invalid mat entry: FFFF.FFFF.FFFF, packet is flooded to ingress VLAN: (3)

018788: Nov 8 05:03:29.417 UTC: DHCP_SNOOPING: invalid DHCP options - unable to parse

018789: Nov 8 05:03:31.934 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018790: Nov 8 05:03:31.934 UTC: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak. Was Gi0/2

018791: Nov 8 05:03:31.934 UTC: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Gi0/2 for pak. Was not set

018792: Nov 8 05:03:31.934 UTC: DHCP_SNOOPING: received new DHCP packet from input interface (GigabitEthernet0/2)

Any clue.. why is this happening

16 REPLIES 16
Highlighted

"no ip dhcp snooping information option"    worked for me!

 

Thanks Alain!

Highlighted
Beginner

no ip dhcp snooping information option   , this option worked for me thanks alot for your help

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