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Knowledge Base

DHCP option82 format Mismatch

Publication Date:  2017-10-08  |   Views:  484  |   Downloads:  0  |   Author:  e84084586  |   Document ID:  EKB1000926688


Issue Description

ISSUE: Broadhop CISCO AAA server  to authenticate the user to access the internet needs the port where the computer is connected plus the private ip he check the option82 to get this info but the format of cisco and huawei is different

Handling Process

Server didnot understand the  huawei format 

hence studied the difference between the 2 formats 

Root Cause

CISCO Format

relay-agent-info = 01:06:00:04:04:57:01:01:02:08:00:06:c4:0a:cb:c2:72:80

circuit-id 1 00:04:04:57:01:01

remote-id 2 00:06:c4:0a:cb:c2:72:80

CID format: circuit-id type (0) + length (4) + SVLAN ID (2 bytes) + slot ID (5 bits) + subslot ID (3 bits) + port (1 byte), in hexadecimal notation

RID format: remote-id type (0) + length (6) + device MAC address (6 bytes), in hexadecimal notation

Huawei default format

CID format: interface name:svlan.cvlan, host name/0/0/0/0/0, in ASCII format

RID format: device MAC address, in hexadecimal notation


Resoultion: enter this command in the system-view on s5700 and s5720 dhcp option82 format extend