Cisco Nexus 9000 Series Configuration Manual page 156

DHCP Relay on VTEPs
interface Vlanl00l
• 9372-2
9372—2# sh run dhcp
!Command: show running-config dhcp
!Time: Mon Aug 24 08:26:16 2015
version 7.0(3) 11(3)
feature dhcp
service dhcp
ip dhcp relay
ip dhcp relay information option
ip dhcp relay information option vpn
ipv6 dhcp relay
interface Vlanl00l
Debug Output
• The following is a packet dump for DHCP interact sequences.
9372-1# ethanalyzer local interface inband display-filter
"udp.srcport==67 or udp.dstport==67" limit-captured frames 0
Capturing on inband
20150824 09:31:38.129393 0.0.0.0 -> 255.255.255.255 DHCP DHCP Discover - Transaction
ID 0x860cd13
20150824 09:31:38.129952 11.11.11.11 -> 192.1.42.3 DHCP DHCP Discover - Transaction ID
0x860cd13
20150824 09:31:40.130134 192.1.42.3 -> 11.11.11.11 DHCP DHCP Offer - Transaction ID
0x860cd13
20150824 09:31:40.130552 172.16.16.1 -> 172.16.16.11 DHCP DHCP Offer - Transaction ID
0x860cd13
20150824 09:31:40.130990 0.0.0.0 -> 255.255.255.255 DHCP DHCP Request - Transaction ID
0x860cd13
20150824 09:31:40.131457 11.11.11.11 -> 192.1.42.3 DHCP DHCP Request - Transaction ID
0x860cd13
20150824 09:31:40.132009 192.1.42.3 -> 11.11.11.11 DHCP DHCP ACK - Transaction ID
0x860cd13
20150824 09:31:40.132268 172.16.16.1 -> 172.16.16.11 DHCP DHCP ACK - TransactionID
0x860cd13
Note
• DHCP Discover packet 9372-1 sent to DHCP server.
giaddr is set to 11.11.11.11(loopback1) and suboptions 5/11/151 are set accordingly.
Bootstrap Protocol
Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 7.x
144
ip dhcp relay address 192.1.42.3
ip dhcp relay source—interface loopback1
ip dhcp relay address 192.1.42.3
ip dhcp relay source—interface loopback1
Ethanalyzer might not capture all DHCP packets because of inband interpretation issues
when you use the filter. You can avoid this by using SPAN.
Message type: Boot Request (1)
Hardware type: Ethernet (0x01)
DHCP Relay in VXLAN BGP EVPN