S5735 toubleshooting

Hi user!

Solution:
To solve the problem we enabled the DHCP function on the switch by running the “dhcp enable “command in order to have the received DHCP packets processed and forwarded by the CPU of the switch.

After further investigation we noticed, that the problem in question appears in the vlans that do not have the dhcp function enabled in the situation where the switch is configured as a DHCP client in an interface with the “ip address dhcp alloc-ip" command without having the DHCP function globally enabled globally.

Thanks!

Hi,

You can find the DHCP troubleshooting guidelines on following link:

https://support.huawei.com/hedex/hdx.do?docid=EDOC1000091882&lang=en

I hope it helps.

Hello,

It is possible to run a packet capture on the DHCP server to see the packets coming from switch and if the server replies ? It is expected to see the DHCP Request coming from switch and server to return the Offer.

Try to open a debug and check if Discovery is sent or Request after Offer:

<Huawei>debugging dhcp all packet
<Huawei>t m
<Huawei>t d
And configure the 'ip address dhcp-alloc' on Vlanif and check whether packets are sent out. 

It will show like this: 

Also please be sure that the interface is Up, there should be some interface added in that VLAN in order for VLANif to have the state Up.

You can stop debug using 'undo' parameter before the above command.
Hope it's useful.

thanks!

Great

great!!