CCNP TSHOOT 6.0 - Cisco Learning Home
CCNP TSHOOT 6.0 - Cisco Learning Home
CCNP TSHOOT 6.0 - Cisco Learning Home
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<strong>CCNP</strong>v6 <strong>TSHOOT</strong><br />
*Mar 1 09:10:36.921: DHCPSNOOP(hlfm_set_if_input): Setting if_input to Po1 for<br />
pak. Was not set<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: received new DHCP packet from input interfa<br />
ce (Port-channel1)<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: process new DHCP packet, message type: DHCP<br />
ACK, input interface: Po1, MAC da: ffff.ffff.ffff, MAC sa: 0017.5a5b.b443, IP da<br />
: 255.255.255.255, IP sa: 10.1.10.252, DHCP ciaddr: 0.0.0.0, DHCP yiaddr: 10.1.1<br />
0.1, DHCP siaddr: 0.0.0.0, DHCP giaddr: 0.0.0.0, DHCP chaddr:<br />
ALS1# 000b.db04.a5cd<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: binary dump of option 82, length: 20 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 09:10:36.921: DHCP_SNOOPING: binary dump of extracted circuit id, length<br />
: 8 data:<br />
0x1 0x6 0x0 0x4 0x0 0xA 0x1 0x12<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: binary dump of extracted remote id, length:<br />
10 data:<br />
0x2 0x8 0x0 0x6 0x0 0x1B 0xC 0x6D 0x8F 0x0<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING_SW: opt82 data indicates lo<br />
ALS1#cal packet<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING_SW: opt82 data indicates local packet<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: remove relay information option.<br />
*Mar 1 09:10:36.921: DHCP_SNOOPING: direct forward dhcp reply to output port: F<br />
astEthernet0/18.<br />
ALS1#u all<br />
All possible debugging has been turned off<br />
ALS1#<br />
In the above example, the ip dhcp relay information trust-all command was issued on DLS1. The<br />
DHCP DISCOVER message received on ALS1 interface Fa0/18 (from PC-B) and was forwarded to DLS1 to<br />
complete the DHCP exchange between PC-B and DLS1.<br />
DLS1#debug ip dhcp server packet<br />
DHCP server packet debugging is on.<br />
Dec 11 14:14:25.024: DHCPD: Reload workspace interface Vlan10 tableid 0.<br />
Dec 11 14:14:25.024: DHCPD: tableid for 10.1.10.252 on Vlan10 is 0<br />
Dec 11 14:14:25.024: DHCPD: client's VPN is .<br />
Dec 11 14:14:25.024: DHCPD: inconsistent relay information.<br />
Dec 11 14:14:25.024: DHCPD: relay information option exists, but giaddr is zero<br />
In the above example, with dhcp relay information from ALS1 and a GIADDR of 0.0.0.0, the relay information is<br />
inconsistent and DLS1 rejects the DHCP DISCOVER message from PC-B.<br />
DLS1#debug ip dhcp server packet<br />
DHCP server packet debugging is on.<br />
Dec 11 14:28:13.118: DHCPD: Reload workspace interface Vlan10 tableid 0.<br />
Dec 11 14:28:13.118: DHCPD: tableid for 10.1.10.252 on Vlan10 is 0<br />
Dec 11 14:28:13.118: DHCPD: client's VPN is .<br />
Dec 11 14:28:13.118: DHCPD: DHCPRELEASE message received from client 0100.0bdb.0<br />
4a5.cd (10.1.10.1).<br />
Dec 11 14:28:15.542: DHCPD: Reload workspace interface Vlan10 tableid 0.<br />
Dec 11 14:28:15.542: DHCPD: tableid for 10.1.10.252 on Vlan10 is 0<br />
Dec 11 14:28:15.542: DHCPD: client's VPN is .<br />
Dec 11 14:28:15.542: DHCPD: using received relay info.<br />
Dec 11 14:28:15.542: DHCPD: DHCPDISCOVER received from client 0100.0bdb.04a5.cd<br />
on interface Vlan10.<br />
All contents are Copyright © 1992–2010 <strong>Cisco</strong> Systems, Inc. All rights reserved. This document is <strong>Cisco</strong> Public Information. Page 12 of 17
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