Ipv6 Register. Automatic Tunnels

Leyendo el mundo de multicast para ipv6, he visto que las version de IOS 12.4T no son tan explicativos en esta parte. Por lo que les coloco un link muy útil en el registro al RP. Hay que saber que utiliza un Tunnel automático. Vayan a la sección de Registering, página 19 del siguiente link:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6552/ps6594/product_data_sheet0900aecd80320fb8.pdf

Los comandos que puedes usar para verificar son los siguientes:
R1-R5-R2 (rp)

Rack1R1#show ipv6 int b
FastEthernet0/0            [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
FastEthernet0/1            [administratively down/down]
    unassigned
Serial0/0/0                [up/up]
    unassigned
Serial0/0/0.13             [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
Serial0/0/0.14             [up/up]
    unassigned
Serial0/0/0.15             [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
Serial0/1/0                [administratively down/down]
    unassigned
Loopback0                  [up/up]
    unassigned
Loopback1                  [up/up]
    unassigned
Loopback100                [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
    2001:1::1
Tunnel0                    [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
    unnumbered (Loopback100)
Tunnel1                    [up/up]
    FE80::AEA0:16FF:FE3E:7E0A
    unnumbered (Loopback100)
Rack1R1# show ipv6 pim tunnel
Tunnel0* 
  Type  : PIM Encap
  RP    : Embedded RP Tunnel
  Source: 2001:1::1
Tunnel1* 
  Type  : PIM Encap
  RP    : 2001:2::2
  Source: 2001:1::1

Se puede observar que automáticamente genera un tunel hacia el RP. Este tunel no es mas que PIM encapsulado a través de esta interfaz (PIM/IPV6):

Rack1R1#show int tunnel1
Tunnel1 is up, line protocol is up 
  Hardware is Tunnel
  MTU 1452 bytes, BW 100 Kbit/sec, DLY 50000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel source 2001:1::1 (Loopback100), destination 2001:2::2
  Tunnel protocol/transport PIM/IPv6
  Tunnel TOS/Traffic Class  0xE0,  Tunnel TTL 65
  Tunnel transport MTU 1452 bytes
  Tunnel transmit bandwidth 8000 (kbps)
  Tunnel receive bandwidth 8000 (kbps)
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
Rack1R1#

Las registraciones se hacen a través de estos tuneles. Por experiencia puedo decir que se puede transportar un paquete icmp a través de esta interfaz y funciona a la perfección.

Rack1R1#ping ff01::1 source loopback100
Output Interface: Tunnel1
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