2920 DHCP pools not functional with routed uplink present

[llsasupport]

i just purchased 2 2920's. they didnt have dhcp functionality until i updated them to the latest software rev. after doing so all seemed well. i created 2 dhcp pools and configured them for 2 vlans. these were working as intended while on my bench.

as these units will go offsite i wanted to do as close to a real test as i could. i took it to our core switch and plugged in directly with a /30 network connecting to vlan 690. only one untagged port is used for 690 (port 48).

that worked, all subnets were pingable etc. However, now the dhcp server stopped providing addressing for ANY dhcp pools. if i disable port 48,  i get dhcp again. its repeatable.

i completely disabled and wiped the DHCP server and re-created it with the same results.

Any suggestions are appreciated.

; J9729A Configuration Editor; Created on release #WB.15.17.0007

; Ver #07:eb.8f.fc.f3.ff.37.2d:89

hostname "ATL-2920"

module 1 type j9729a

qos dscp-map 011000 priority 5

no timesync

ip route 0.0.0.0 0.0.0.0 vlan 690

ip routing

interface 48

disable

rate-limit all out kbps 10000

exit

snmp-server community "" operator

snmp-server contact "" location "Atlanta"

oobm

ip address dhcp-bootp

exit

vlan 1

name "DEFAULT_VLAN"

no untagged 1-48

untagged A1-A2,B1-B2

ip address dhcp-bootp

exit

vlan 620

name "Data"

untagged 1-47

ip address 172.29.20.254 255.255.255.0

qos priority 3

dhcp-server

exit

vlan 650

name "Voice"

tagged 1-47

ip address 172.29.50.254 255.255.255.0

qos dscp 101110

voice

dhcp-server

exit

vlan 670

name "management"

ip address 172.29.70.254 255.255.255.0

exit

vlan 690

name "Uplink "

untagged 48

ip address 192.168.255.218 255.255.255.252

exit

primary-vlan 670

no tftp server

no autorun

no dhcp config-file-update

no dhcp image-file-update

dhcp-server pool "620"

authoritative

default-router "172.29.20.254"

dns-server "10.0.30.1,10.0.30.2"

domain-name "llsa.local"

network 172.29.20.0 255.255.255.0

range 172.29.20.10 172.29.20.200

exit

dhcp-server pool "650"

authoritative

default-router "172.29.50.254"

dns-server "10.0.30.1,10.0.30.2"

domain-name "llsa.local"

network 172.29.50.0 255.255.255.0

range 172.29.50.10 172.29.50.200

exit

dhcp-server enable

password manager

password operator

[llsasupport · Accepted solution]

I have a solution,

if you follow this document.

http://h20564.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=5354494&docId=mmr_kc-0128094&lang=en-us&cc=us

it shows step by step how to create multipule dhcp scopes per vlan.

on my other switches, my default-router was always the vlan interface. in this instance, it HAS to be x.x.x.1

once that was configured, it is now working as intended.

i dont know why this would work while not connected to a default route,  but hey, there it is.