VPLS configuration clarification

[Gaurav Madan]

Hi Team

I am referring to link :

http://www.akbintel.com/mediawiki/index.php/VPLS/Config

Case :

CE1			CE2
|			|
SW1 - PE1 - P1 - PE2 - SW2
|			|
CE3			CE4

!! CE1-CE2 are in VLAN12
!! CE3-CE4 are in VLAN34

I want CE1 to talk to CE2 and similarly CE3 to talk to CE4 . My config looks like following :

l2vpn
 pw-class VPLS_CLASS
  encapsulation mpls
  transport-mode ethernet
 bridge group VPLS_GROUP
  bridge-domain VLAN12
   $INT_TO_PE1_CE1.12
   vfi 12
    neighbor $PE2_lo0 pw-id 12
     pw-class VPLS_CLASS
  bridge-domain VLAN34
   $INT_TO_PE1_CE1.34
   vfi 34
    neighbor $PE2_lo0 pw-id 34
    pw-class VPLS_CLASS

My question is :

On a very high level ; can you please explain what is VFI functionality here ?

1) Do I need to create as many VFIs to make as many vlans on either side talk to each other ? For example in above case ; vfi12 is created to make vlan 12 talk to each other ans similarly vfi34 to make vlan 34 talk .

2) or can we have a vfi to make multiple Vlans talk to each other

What will be difference in 2 approaches ?

[Gaurav Madan]

On another document ; I read following 2 points :

VPLS Uses a Virtual Forwarding Instances (VFI, like VLAN) for customer separation

•VFI creates L2 multipoint bridging among all ACs and VCs. It’s L2 broadcast domain like VLAN

• Multiple VFIs can exist on the same PE box to separate user traffic like VLAN 

Hence if I say ; customer A wants vlan 10 and 20 to talk between 2 diff sites

                         customer B wants to talk vlan 100 and 200 to talk between 2 diff sites

		
SW1(vlan 10,20)  - PE1 - P1 - PE2 - (vlan 10,20) SW2
SW3(vlan 100,200)----|		|-----(vlan 100,200) SW4

SW1 , SW2 : cust A

SW3 , Sw4 : cust B

Can i have config like :

int ten 0/0/0/0.10
vfi 12
    neighbor $PE2_lo0 pw-id 12
int ten 0/0/0/0.20 !
vfi 12
   neigh $PE2 pw-id 12   
*******

int ten 0/0/0/1.100
vfi 34
    neighbor $PE2_lo0 pw-id 12
int ten 0/0/0/1.200 
vfi 34
   neigh $PE2 pw-id 12