
The source interface is determined as follows:
Table 1-1:  Source Interface Determination: BOOTP/DHCP Relay Gateway
Number of  | Number of Interfaces  | 
  | 
Interfaces on  | with Parameter  | Source Interface  | 
VLAN | Enabled | 
  | 
  | 
  | 
  | 
1  | N/A  | The interface itself.  | 
  | 
  | 
  | 
1  | 0  | The first UP interface found.  | 
  | 
  | 
  | 
1  | 1  | Preferred interface if UP; otherwise, first  | 
  | 
  | UP interface found.  | 
  | 
  | 
  | 
1  | 1  | First preferred UP interface found;  | 
  | 
  | otherwise, first UP interface found.  | 
  | 
  | 
  | 
Cajun P220, P550, P550R Switch Release Notes, Release 4.0.1  | 7  |