Juniper ACX1000 Configuration Manual page 859

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pseudowire. ACX2 is connected to two MX Series routers, MX2 and MX3. Connection to
ACX2 to MX2 is through an active pseudowire. ACX2 is linked to MX3 using a standby
pseudowire. MX2 and MX3 are connected to MX1, which is the root of the LSP. MX1 is
linked to an IPTV source.
Point-to-multipoint (P2MP) traffic engineering (TE) LSP is setup from the MX router
(MX-1 is connected to the IPTV source) to the aggregation MX routers (MX-2 & MX-3).
MX-1 is the root of the LSP. MX-2 and MX-3 are the leaves. Leaves cannot be configured
statically or dynamically.
PIM can be enabled between MX-1 and IPTV Source and MX-1 is the DR for the Multicast
source.
mVPN is configured on the default VRF routing instance. Selective tree can be used
for optimal routing.
PIM-SM is running in the Access network between access routers (ACX-1 and ACX-2)
and aggregation routers (MX-1 and MX-2).
MX-1 and MX-2 are the RPs for the PIM-SM.
RPF check is disabled for the multicast groups in aggregation routers for it to accept
the data from remote source.
Rendezvous point (RP) redundancy is achieved by configuring auto-RP in ACXs and
configuring multiple aggregation routers as RP for every access ring (PIM island).
ACX has a bridge-domain and subscriber devices are connected to the BD ports. This
enables the subscribers to be on the same IP subnet. (This method of configuration
suits a topology in which you want all the subscribers connected to the ACXs in a single
access ring to be on the same subnet. This makes the DHCP server pool allocation
policy easier). No local switching is enabled on the bridge domain, to ensure that
subscriber to subscriber communication does not occur locally through the bridge
domain.
Bridge domain has the IRB configuration providing connectivity to the default VRF
router instance. IGMP is enabled on the IRB interface. This enables the IGMP join
messages send by the subscriber devices to be processed by the routing module and
in turn triggers a PIM join towards RP in the default routing instance.
IGMP snooping is enabled on the bridge domain for an optimal forwarding of multicast
data at the BD level.
ACX router receives the multicast data on the default VRP context and the data gets
forwarded on to the BD through IRB and gets replicated on the BD ports based on the
membership detected through IGMP snooping.
Unicast control traffic between Subscriber devices and the IPTV subscriber
management server goes through the private VPN domain.
Aggregation routers have VPLS full-mesh connectivity between each other and ACX
works as H-VPLS MTU.
There is a PW set up between ACX and the aggregation router. LT interface does the
stitching of the Bridge domain with the PW.
Chapter 25: Configuring Layer 2 and Layer 3 Services
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