description dhcp relay multihop/chaining

addrouter r1
int eth1 eth 0000.0000.1111 $1a$ $1b$
int eth2 eth 0000.0000.1112 $2a$ $2b$
!
vrf def v1
 rd 1:1
 exit
server dhcp4 RELAY4
 mode relay
 helper-addresses 1.1.1.2
 vrf v1
 exit
server dhcp6 RELAY6
 mode relay
 helper-addresses 1111::2
 vrf v1
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1111::1 ffff::
 exit
int eth2
 vrf for v1
 ipv4 addr 1.2.0.1 255.255.255.0
 ipv6 addr 1201::1 ffff::
 ipv4 dhcp-relay RELAY4
 ipv6 dhcp-relay RELAY6
 exit
ipv4 route v1 0.0.0.0 0.0.0.0 1.1.1.2
ipv6 route v1 :: :: 1111::2
!

addrouter r2
int eth1 eth 0000.0000.2211 $1b$ $1a$
int eth2 eth 0000.0000.2222 $3a$ $3b$
!
vrf def v1
 rd 1:1
 exit
server dhcp4 RELAY4
 mode relay
 helper-addresses 2.2.2.2
 vrf v1
 exit
server dhcp6 RELAY6
 mode relay
 helper-addresses 2222::2
 vrf v1
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1111::2 ffff::
 ipv4 dhcp-relay RELAY4
 ipv6 dhcp-relay RELAY6
 exit
int eth2
 vrf for v1
 ipv4 addr 2.2.2.1 255.255.255.0
 ipv6 addr 2222::1 ffff::
 exit
ipv4 route v1 0.0.0.0 0.0.0.0 1.1.1.1
ipv6 route v1 :: :: 1111::1
!

addrouter r3
int eth1 eth 0000.0000.3331 $3b$ $3a$
!
vrf def v1
 rd 1:1
 exit
int eth1
 vrf for v1
 ipv4 addr 2.2.2.2 255.255.255.0
 ipv6 addr 2222::2 ffff::
 exit
ipv4 route v1 0.0.0.0 0.0.0.0 2.2.2.1
ipv6 route v1 :: :: 2222::1
server dhcp4 dh4
 pool 1.2.0.100 1.2.0.199
 gateway 1.2.0.1
 netmask 255.255.255.0
 interface ethernet1
 vrf v1
 exit
server dhcp6 dh6
 netmask ffff:ffff:ffff:ffff::
 gateway 1201::1
 interface ethernet1
 dynamic-address
 vrf v1
 exit
!

addrouter r4
int eth1 eth 0000.0000.c111 $2b$ $2a$
!
vrf def v1
 rd 1:1
 exit
prefix-list p4
 sequence 10 permit 0.0.0.0/0 ge 0 le 0
 exit
prefix-list p6
 sequence 10 permit ::/0 ge 0 le 0
 exit
int eth1
 vrf for v1
 ipv4 address dynamic dynamic
 ipv4 gateway-prefix p4
 ipv4 dhcp-client enable
 ipv4 dhcp-client early
 ipv6 address dynamic dynamic
 ipv6 enable
 ipv6 gateway-prefix p6
 ipv6 dhcp-client enable
 ipv6 dhcp-client early
 exit
!

r1 tping 100 20 1.1.1.2 vrf v1
r2 tping 100 20 1.1.1.1 vrf v1
r4 tping 100 20 2.2.2.1 vrf v1
r4 tping 100 20 1.1.1.2 vrf v1


r1 tping 100 20 1111::2 vrf v1
r2 tping 100 20 1111::1 vrf v1
r4 tping 100 20 2222::1 vrf v1
r4 tping 100 20 1111::2 vrf v1