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OS10 dhcp relay option 82
Hello!
I little confused with option 82 relay trough S5224F OS10 switch. I have N3200 stacked switches on access level where directly connected to VLT paired S5224F switches. IP helper for the clients vlan is enabled on OS10 switches. N3200 configured for use option 82.
I expect to see the CircuitID and RemoteID values from the N3200 switch in the DHCPDISCOVER packet. But instead, the S5224F changes the values in option 82 in the DHCP packet to its downlink port.
In OS9 was present "ip dhcp relay trust-downstream" option which where no rewrite option 82 values received from prevous-hop router. But in OS 10 this command was removed.
I need help to configure my switches for relay original option 82 values from client-face port on access switch.
DELL-Charles R
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February 8th, 2024 21:48
Hello,
This may help. DHCP relay agent options for OS10.5.5:
Page 259-272
https://dell.to/3waXzDy
leonid Zebarsky
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February 9th, 2024 11:32
Hello,
I learn this document but not found useful information.
After some investigation I look output of this command on access switch N3200 for upstream port:
#show dhcp l2relay stats interface po1
Interface UntrustedServer UntrustedClient TrustedServer TrustedClient
MsgsWithOpt82 MsgsWithOpt82 MsgsWithoutOpt82 MsgsWithoutOpt82
--------- --------------- ----------------- ----------------- -----------------
Po1 0 0 1805 1834
As I understand, it's mean that access switch not add op82 information to DHCP packet. It's true?
My configuration details -
show version
Machine Description............... Dell Networking Switch
System Model ID................... N3248TE-ON
Machine Type...................... Dell Networking N3248TE-ON
Serial Number..................... TW0KRFFYDNT002AC0639
Manufacturer...................... 0xbc00
Burned In MAC Address............. E8B5.D0D4.294B
System Object ID.................. 1.3.6.1.4.1.674.10895.3113
CPU Version....................... C3336
SOC Version....................... BCM56371_A2
HW Version........................ 4
CPLD Versions..................... System 01.06 CPU 00.06
Image File........................ N3200v6.8.1.3
Software Capability............... Stack Limit = 12, VLAN Limit = 4093
unit active backup current-active next-active
---- ----------- ----------- -------------- --------------
1 6.8.1.3 6.6.3.15 6.8.1.3 6.8.1.3
2 6.8.1.3 6.6.3.15 6.8.1.3 6.8.1.3
3 6.8.1.3 6.6.3.15 6.8.1.3 6.8.1.3
4 6.8.1.3 6.6.3.15 6.8.1.3 6.8.1.3
5 6.8.1.3 6.7.1.10 6.8.1.3 6.8.1.3
#show dhcp l2relay vlan 17 //clents vlan
DHCP L2 Relay is Enabled.
#show dhcp l2relay interface port-channel 1 //Upstream port
DHCP L2 Relay is Enabled.
Interface L2RelayMode TrustMode
---------- ----------- --------------
Po1 Enabled trusted
#show dhcp l2relay interface gigabitethernet 4/0/19 //Client connection
DHCP L2 Relay is Enabled.
Interface L2RelayMode TrustMode
---------- ----------- --------------
Gi4/0/19 Enabled untrusted
Also I get broken output of #show dhcp l2relay all command:
DELL-Erman O
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February 9th, 2024 12:36
Hi, I've read the thread but this is a complex issue I can recommend to reach local Dell support team for further review. Or let's see how contribute the thread our community,