No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade
Knowledge Base

DHCP option82 format Mismatch

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

Contents

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


Solution

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