CCNP TSHOOT 6.0 - The Cisco Learning Network
CCNP TSHOOT 6.0 - The Cisco Learning Network
CCNP TSHOOT 6.0 - The Cisco Learning Network
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<strong>CCNP</strong>v6 <strong>TSHOOT</strong><br />
ALS1#debug ip dhcp snooping packet<br />
DHCP Snooping Packet debugging is on<br />
ALS1#<br />
*Mar 1 09:04:48.215: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Fa0/18 f<br />
or pak. Was not set<br />
*Mar 1 09:04:48.215: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak.<br />
Was Fa0/18<br />
*Mar 1 09:04:48.215: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Fa0/18 f<br />
or pak. Was not set<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING: received new DHCP packet from input interfa<br />
ce (FastEthernet0/18)<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING: process new DHCP packet, message type: DHCP<br />
DISCOVER, input interface: Fa0/18, MAC da: ffff.ffff.ffff, MAC sa: 000b.db04.a5cd,<br />
IP da: 255.255.255.255<br />
, IP sa: 0.0.0.0, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 0.0.0.0, DHCP siaddr: 0.0.0<br />
.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 000b.db04.a5cd<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING: add relay information option.<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING_SW: Encoding opt82 CID in vlan-mod-port form<br />
at<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING_SW: Encoding opt82 RID in MAC address format<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING: binary dump of relay info option, length: 20<br />
data:<br />
0x52 0x12 0x1 0x6 0x0 0x4 0x0 0xA 0x1 0x12 0x2 0x8 0x0 0x6 0x0 0x1B 0xC 0x6D 0x8<br />
F 0x0<br />
*Mar 1 09:04:48.215: DHCP_SNOOPING_SW: bridge packet get invalid mat entry: FFF<br />
F.FFFF.FFFF, packet is flooded to ingress VLAN: (10)<br />
ALS1#<br />
In the above example, a DHCP DISCOVER message with option 82 and GIADDR of 0.0.0.0 was sent to DLS1<br />
but, because DLS1 does not trust this relay information a reply was not received from the DLS1 DHCP server.<br />
ALS1#debug ip dhcp snooping packet<br />
DHCP Snooping Packet debugging is on<br />
ALS1#<br />
*Mar 1 09:10:36.904: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Fa0/18 f<br />
or pak. Was not set<br />
*Mar 1 09:10:36.904: DHCPSNOOP(hlfm_set_if_input): Clearing if_input for pak.<br />
Was Fa0/18<br />
*Mar 1 09:10:36.904: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Fa0/18 f<br />
or pak. Was not set<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING: received new DHCP packet from input interfa<br />
ce (FastEthernet0/18)<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING: process new DHCP packet, message type: DHCP<br />
DISCOVER, input interface: Fa0/18, MAC da: ffff.ffff.ffff, MAC sa: 000b.db04.a5cd,<br />
IP da: 255.255.255.255<br />
, IP sa: 0.0.0.0, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 0.0.0.0, DHCP siaddr: 0.0.0<br />
.0, DHCP giaddr: 0.0.0.0, DHCP chaddr: 000b.db04.a5cd<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING: add relay information option.<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING_SW: Encoding opt82 CID in vlan-mod-port form<br />
at<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING_SW: Encoding opt82 RID in MAC address format<br />
*Mar 1 09:10:36.904: DHCP_SNOOPING: binary dump of relay info option, length: 20<br />
data:<br />
0x52 0x12 0x1 0x6 0x0 0x4 0x0 0xA 0x1 0x12 0x2 0x8 0x0 0x6 0x0 0x1B 0xC 0x6D 0x8<br />
All contents are Copyright © 1992–2010 <strong>Cisco</strong> Systems, Inc. All rights reserved. This document is <strong>Cisco</strong> Public Information. Page 10 of 17
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