dhcp-snooping, switch don't insert option 82 information

[Alexandr_P]

Hello, colleagues!

I need to insert option 82 information in dhcp-packets.
Try bootprelay - all work fine.

Trying dhcp-snooping - switch don't insert option 82 information.

My config:
enable ip-security dhcp-snooping vlan v74_Users port 16 violation-action none
enable ip-security dhcp-snooping vlan v74_Users port 20 violation-action none
enable ip-security dhcp-snooping vlan v74_Users port 21 violation-action none
enable ip-security dhcp-snooping vlan v74_Users port 26 violation-action none
enable ip-security dhcp-snooping vlan v74_Users port 27 violation-action none
configure trusted-ports 26 trust-for dhcp-server
configure ip-security dhcp-snooping information option
configure ip-security dhcp-snooping information check
configure ip-security dhcp-snooping information circuit-id vlan-information v74 vlan v74_Users
configure ip-security dhcp-snooping information circuit-id vlan-information v75 vlan v75_Users2
configure ip-security dhcp-bindings storage write-interval 1440
configure ip-security dhcp-bindings storage filename bind.txt.xsf
enable ip-security dhcp-bindings restoration

User_Guide say:
When DHCP relay is configured in a DHCP snooping environment, the relay agent IP address should be configured as the trusted server.

“configure trusted-servers {vlan} add server trust-for dhcp-server”

Should I add IP-address of DHCP-server or/and configure Extreme's switch as trusted-server? But I have "configure trusted-ports 26 trust-for dhcp-server"

Any ideas?

Thank you!

[Jarek]

I think we should ask person who was wrote this document .

Maybe phrase " DHCP request packet " is it not the same as "DHCP Request packet"

--
Jarek

[Alexandr_P]

Hi, Jarek!

I rely on the information given in the EXOS_User_Guide, which says: "The DHCP relay agent option feature inserts a piece of information, called option 82, into any DHCP request packet that is to be relayed by the switch"

I understand that after DHCP-Discover message (with option 82) DHCP-server offer some IP-address for client.
But why then User_Guide said that option 82 have to insert in DHCP-Request packet?

Thank you!

[Alexandr_P]

Any ideas - why option 82 insert in the DHCP-Discover, but not in DHCP-Request?

Or I something miss?

Thank you!

[Alexandr_P]

You are right.

But main problem that I can see option 82 in DHCP-Discover packets (with my information), but I can't see this information in DHCP-Request packets.

[Alexandr_P]

I think you have some wrong.
In this case switch have to work as relay agent and insert option 82 information (in my case - v74).
Also switch can replace option 82 information.

EXOS-User-Guide said this.

Thank you!