I’m testing CRS326-24G+2S, ROS 6.45.6.
One bridge, 5 vlans (with 5 VIFs), vlan filtering ON, dhcp-snooping ON, option 82 ON.
Vlan 11 for testin purposes.
DHCP server connected to port 2 (pvid 11, untag vlan 11, trusted)
Client connected to port 15 (pvid 11, untag vlan 11, untrasted)
When client connects and send DHCPDISCOVERY, the server receives 2 packets: first WITHOUT option 82 then second (same packet) WITH option 82.
Why? This is not valid for my DHCP-server, the configuration of which depends on option 82.
But if I turn off hw-offload on port 2, then the server receives only one packet. And packet contains option 82.
In this case, how do I understand the following (on wiki page):
Note: Currently only > CRS3xx devices fully support hardware DHCP Snooping and Option 82> . For > CRS1xx and CRS2xx series > switches it > is possible > to use DHCP Snooping > along with VLAN switching> , but then you must make sure that DHCP packets are sent out with the correct VLAN tag using egress ACL rules. > Other devices > are capable of using DHCP Snooping and Option 82 features along with hardware offloading, > but you must make sure that there is no VLAN related configuration applied on the device> , otherwise DHCP Snooping and Option 82 might not work properly. See Bridge Hardware Offloading section with supported features.
Which is true:
- CRS326-24G support DHCP Snooping and Option 82 with hardware offloading and VLANS.
- Or CRS326-24G NOT support DHCP Snooping and Option 82 with hardware offloading and VLANS.
- It may be a bug and will be fixed later.