Paket multicast hanya bisa di replikasi di BRAS.
Apabila ada banyak ONT, maka trunk antara OLT ke BRAS akan penuh, karena multicast yang sama di kirim ONT per ONT.
Jika multicast ini di kirim dalam VLAN berbeda dengan Internet, dan PPPoE hanya jalan di di VLAN internet, maka multicast ini bisa di bocorkan di OLT/Switch Layer 2. Jika ini terjadi maka trunk antara OLT dan BRAS akan ringan. Karena replikasi multicast terjadi di OLT.
Perhatikan diagram berikut.
Dengan detail network config sbb:
Dalam diagram diatas, pada BRAS akan ada 2 VRF, dan dalam OLT dan ONT akan ada 2 VLAN.
BRAS:
vrf 100, untuk Internet
vrf 200, untuk IPTV
OLT, ONT:
vlan 100, untuk Internet
vlan 200, untuk IPTV
Server nanti akan kirim streaming 234.1.1.1, dan kedua STB (30.0.0.2 dan 30.0.0.3) akan respond.
Berikut confignya.
Server
======
hostname Server
!
interface GigabitEthernet0/0
ip address 40.0.0.2 255.255.255.0
!
ip route 0.0.0.0 0.0.0.0 40.0.0.1
!
Server#ping 234.1.1.1
RGW
======
hostname RGW
!
interface FastEthernet0/0
no ip address
pppoe-client dial-pool-number 1
!
interface Dialer1
mtu 1492
ip address negotiated
encapsulation ppp
dialer pool 1
ppp ipcp route default
!
STB
======
hostname STB
!
interface FastEthernet0/0
ip address 30.0.0.3 255.255.255.0
ip igmp join-group 234.1.1.1
!
ip route 0.0.0.0 0.0.0.0 30.0.0.1
!
STB1
======
hostname STB1
!
interface FastEthernet0/0
ip address 30.0.0.2 255.255.255.0
ip igmp join-group 234.1.1.1
!
ip route 0.0.0.0 0.0.0.0 30.0.0.1
!
ONT
======
hostname ONT
!
interface FastEthernet1/13
switchport mode trunk
!
interface FastEthernet1/14
switchport access vlan 200
!
interface FastEthernet1/15
switchport access vlan 100
!
ESW1 (OLT)
==========
hostname ESW1
!
interface FastEthernet1/7
switchport access vlan 200
!
interface FastEthernet1/8
switchport mode trunk
!
interface FastEthernet1/9
switchport mode trunk
!
BRAS
======
hostname BRAS
!
ip vrf 100
description VRF Internet
!
ip vrf 200
description VRF IPTV
!
bba-group pppoe MKMLAB
virtual-template 1
!
!
interface FastEthernet0/0
no ip address
!
interface FastEthernet0/0.100
description VRF Internet to RGW RGW
encapsulation dot1Q 100
ip vrf forwarding 100
pppoe enable group MKMLAB
!
interface FastEthernet0/0.200
description VRF IPTV to L2 STB STB
encapsulation dot1Q 200
ip vrf forwarding 200
ip address 30.0.0.1 255.255.255.0
ip pim dense-mode
!
!
interface Ethernet1/0
description VRF IPTV to Server IPTV
ip vrf forwarding 200
ip address 40.0.0.1 255.255.255.0
ip pim dense-mode
!
interface Ethernet1/1
description VRF Internet to GW
ip vrf forwarding 100
ip address 10.0.0.1 255.255.255.0
!
!
interface Virtual-Template1
ip vrf forwarding 100
ip address 20.0.0.1 255.255.255.0
peer default ip address pool POOLRESI
ppp ipcp route default
!
ip local pool POOLRESI 20.0.0.2 20.0.0.253
!
Catatan:
Beberapa command untuk Router VRF:
ip route vrf <name> net mas ip_gw
ping vrf <name> ip_dest
traceroute vrf <name> ip_dest
sh ip route vrf <name>
sh ip mroute vrf <name>
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