7.2  Corridor Access for MAN 
Figure 7-2 MAN access 
 
MAN access can adopt ordinary tree type and ZESR plus PVLAN. Working with DHCP 
snooping  and ip  source  guard,  it provides  users  with high  security  guarantee.  At the 
same  time,  ZXR10  5250  can  use  QinQ  or  SVLAN  to  further  distinguish  users  and 
services,  and  to  provide  rich  control  information  for  service  planning  of  the  whole 
network.