RFC4045 - Extensions to Support Efficient Carrying of Multicast Traffic in Layer-2 Tunneling Protocol (L2TP)

The group state for this L2TP tunnel will be:

(G1, INCLUDE, {S1, S2)})

If the LNS policy allows one replication context per (group, source),
two replication contexts will be created:

-RC1:
(S1, G1) packets, Multicast Session MS1, OSL = 1, 2, 3, 4, 5, 6
-RC2:
(S2, G1) packets, Multicast Session MS2, OSL = 4, 5, 6, 7, 8, 9

If the LNS policy allows one replication context per (group, source-
list), one replication context will be created:

-RC1:
({S1, S2}, G1) packets, Multicast Session MS1, OSL = [1..9]

*Example 3:

All users are managed in the same control connection.

Users {1, 2} subscribe to (Group G1, EXCLUDE {S1})
User {3} subscribes to (Group G1, EXCLUDE {S1, S2})

The group state for this L2TP tunnel will be:

(G1, EXCLUDE, {S1})

Therefore, one replication context will be created:

-RC1:
(*-{S1}, G1) packets, Multicast Session MS1, OSL = 1, 2, 3

Next, user {4} subscribes to (Group G1, INCLUDE {S1}). The group
state for the L2TP tunnel is changed to:

(G1, EXCLUDE, {})

The replication context RC1 is changed to:

-RC1: (*, G1) packets, Multicast Session MS1, OSL = 1, 2, 3, 4

*Example 4:

All users are managed in the same control connection. The LNS policy
allows one replication context per (group, source).

Users {1, 2, 3} subscribe to (Group G1, INCLUDE {S1, S2})

The group state for this L2TP tunnel will be:

(G1, INCLUDE, {S1, S2)})

Therefore, two replication contexts will be created:

-RC1:
(S1, G1) packets, Multicast Session MS1, OSL = 1, 2, 3
-RC2:
(S2, G1) packets, Multicast Session MS2, OSL = 1, 2, 3

Next, user {4} subscribes to (Group G1, EXCLUDE {}), equivalent to an
IGMPv2 membership report. The group state for the L2TP tunnel is
changed to:

(G1, EXCLUDE, {})

The replication context RC1 is changed to:

-RC1: (*, G1) packets, Multicast Session MS1, OSL = 1, 2, 3, 4

The replication context RC2 is changed to:

-RC2: no packets to forward, Multicast Session MS2, OSL = {}
(Multicast Session MS2 will be deleted)

When user {4} leaves G1, the group state for the L2TP tunnel goes
back to:

(G1, INCLUDE, {S1, S2})

Replication contexts become:

-RC1:

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