Hi there,
I’m really new in MikroTik, and maybe now is coming a stupid question or a wrong configuration 
I was upgrading to 10G my network an bought a CRS312 router.
This router is just used for switching now - no routing. Router is still my pfxxxxx…
The switch I replaced with the MikroTik was my DHCP relay until now. Now I’d like to use the CRS312 to relay vLAN specific DHCP requests to my DHCP server.
I tried in IP-DHCP Relay all interfaces, but no requests were recognized.
This is my current configuration:
[admin@SWI-SITE-B-MikroTik-CRS312] > /export
# oct/29/2020 16:08:47 by RouterOS 6.48beta12
# software id = UEV9-3E9I
#
# model = CRS312-4C+8XG
# serial number = xxxxxxxxxxxxx
/interface bridge
add name=bridge1 vlan-filtering=yes
/interface ethernet
set [ find default-name=combo1 ] l2mtu=1592
set [ find default-name=combo2 ] l2mtu=1592
set [ find default-name=combo3 ] l2mtu=1592
set [ find default-name=combo4 ] l2mtu=1592
set [ find default-name=ether1 ] l2mtu=1592
set [ find default-name=ether2 ] l2mtu=1592
set [ find default-name=ether3 ] l2mtu=1592
set [ find default-name=ether4 ] l2mtu=1592
set [ find default-name=ether5 ] l2mtu=1592
set [ find default-name=ether6 ] l2mtu=1592
set [ find default-name=ether7 ] l2mtu=1592
set [ find default-name=ether8 ] l2mtu=1592
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip hotspot profile
set [ find default=yes ] html-directory=flash/hotspot
/snmp community
set [ find default=yes ] disabled=yes
add addresses=192.168.21.21/32 name=xxxxxx
/user group
set full policy=local,telnet,ssh,ftp,reboot,read,write,policy,test,winbox,password,web,sniff,sensitive,api,romon,dude,tikapp
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=ether5
add bridge=bridge1 interface=ether6
add bridge=bridge1 interface=ether7 pvid=110
add bridge=bridge1 interface=ether8 pvid=110
add bridge=bridge1 interface=combo1
add bridge=bridge1 interface=combo2
add bridge=bridge1 interface=combo3
add bridge=bridge1 interface=combo4
/interface bridge vlan
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=11
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=17
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=21
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=31
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=41
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=61
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=71
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=111
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=172
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=110
add bridge=bridge1 tagged=ether1,ether2,ether3,ether4,ether5,ether6,ether7,ether8,combo1,combo2,combo3,combo4 vlan-ids=51
/ip address
add address=192.168.1.3/24 interface=bridge1 network=192.168.1.0
/ip dhcp-relay
add dhcp-server=192.168.21.2 disabled=no interface=bridge1 local-address=192.168.1.0 name=relay1
/ip firewall nat
add action=masquerade chain=srcnat out-interface=all-ethernet
/ip route
add distance=1 gateway=192.168.1.1
/snmp
set contact=asc enabled=yes location=RackServer trap-community=xxxxxxxx trap-interfaces=all
/system clock
set time-zone-name=Europe/Zurich
/system identity
set name=SWI-SITE-B-MikroTik-CRS312
/system ntp client
set enabled=yes primary-ntp=192.168.21.2
/system routerboard settings
set boot-os=router-os
/tool e-mail
set address=192.168.21.25 from=Switch-12XG<xxxxxxxxxx@xxxxx.ch>
/tool sniffer
set filter-interface=all streaming-enabled=yes streaming-server=192.168.1.154
Does anyone have an idea?
Thanks in advanced!