Tuesday, January 29, 2019

networking: LLDP

LLDP - Link Layer Discovery Protocol: is a vendor-neutural, standards-based protocol used to advertise and discover directly connected devices (IEEE 802.1ab).

Informed via LLDP Data Units which contain at least the three following TLV’s (type-length-value):

  • Chassis ID
  • Port ID
  • Time-to-Live (TTL)

LLDP is the standards-based protocol that allows for the discovery and communication between directly connected devices, while TLV's standardize what information can be exchanged.

Example of LLDP TLV's from a Ruckus Switch:

Wednesday, January 9, 2019

Office 365 Migration Issue

While migrating a client to O365 Exchange Online, I encountered an issue with mailboxes not syncing. After some quick troubleshooting it was determined they lacked the "UserName@DomainName.mail.onmicrosoft.com" proxy address, required for the sync.

Below is the PowerShell script I wrote to add a proxyAddress to all users in the specified OU:

Import-Module ActiveDirectory 
$searchbase = "OU=OrgUnit,DC=DomainName,DC=Suffix"
$newdomain = '@DomainName.mail.onmicrosoft.com'
$users = Get-ADUser -SearchBase $searchbase -Filter * -Properties SamAccountName
ForEach ($user in $users) {
    $SamAccountName = $user.SamAccountName
    Set-ADUser -Identity "$SamAccountName" -Add @{
        'proxyAddresses' = "smtp:$SamAccountName‎" + $newdomain
    Write-Host "Adding proxyAddress to $SamAccountName"