IPv6 RP questions

[gongya001]

Based on my understanding of IPv4 multicast, if I join a group on the receiver, RP will show a (*,G) tree.

When I configured via the following command

interface Loopback1
 no ip address
 ipv6 enable
 ipv6 mld join-group FF0E::1
 ipv6 mld join-group FF0E::2
 ipv6 mld join-group FF0E::3

I expected to see a (*,G) tree on R5, which is configured as a RP, but I did not see it.

Anything have I missed ?

On R2

R2#show run | i int|ipv6
mmi polling-interval 60
ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing
interface Loopback0
 ipv6 address 2002::2:2:2:2/128
interface Ethernet0/0
 ipv6 address 2001:192:166:1::2/64
 ipv6 enable
interface Ethernet0/1
 ipv6 address 2001:172:16:24::2/64
 ipv6 enable
interface Ethernet0/2
 ipv6 address 2001:172:16:23::2/64
 ipv6 enable

ipv6 pim rp-address 2005::5:5:5:5

R2#ping 2005::5:5:5:5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2005::5:5:5:5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

On R4

R4#show run | i int|ipv6
mmi polling-interval 60
ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing
interface Loopback0
 ipv6 address 2004::4:4:4:4/128
interface Ethernet0/0
 ipv6 address 2001:172:16:34::4/64
 ipv6 enable
interface Ethernet0/1
 ipv6 address 2001:172:16:24::4/64
 ipv6 enable
interface Ethernet0/2
 ipv6 address 2001:172:16:14::4/64
 ipv6 enable

ipv6 pim rp-address 2005::5:5:5:5

R4#ping 2005::5:5:5:5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2005::5:5:5:5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/22 ms

On R5

RP#show run | i int|ipv6
mmi polling-interval 60
ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing
interface Loopback0
 ipv6 address 2005::5:5:5:5/128
interface Ethernet0/3
 ipv6 address 2001:172:16:54::5/64
 ipv6 enable

ipv6 pim rp-address 2005::5:5:5:5

thanks !!

[Georg Pauwen]

Hello,

hard to tell what you are missing without seeing the full configs of all routers in your topology, can you post those ?

[gongya001]

On the receiver:

ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing

interface Loopback1
 no ip address
 ipv6 enable
 ipv6 mld join-group FF0E::1
 ipv6 mld join-group FF0E::2
 ipv6 mld join-group FF0E::3
!
interface Ethernet0/0
 no ip address
 ipv6 address 2001:192:166:1::7/64
 ipv6 enable
 ipv6 mld join-group FF0E::5

router eigrp CCIE
 !
 address-family ipv6 unicast autonomous-system 10
  !
  topology base
  exit-af-topology
  eigrp router-id 7.7.7.7
 exit-address-family

On R2

ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing

interface Loopback0
 no ip address
 ipv6 address 2002::2:2:2:2/128
!
interface Ethernet0/0
 no ip address
 ipv6 address 2001:192:166:1::2/64
 ipv6 enable
!
interface Ethernet0/1
 no ip address
 ipv6 address 2001:172:16:24::2/64
 ipv6 enable
!
interface Ethernet0/2
 no ip address
 ipv6 address 2001:172:16:23::2/64
 ipv6 enable

router eigrp CCIE
 !
 address-family ipv6 unicast autonomous-system 10
  !
  topology base
  exit-af-topology
  eigrp router-id 2.2.2.2
 exit-address-family

ipv6 pim rp-address 2005::5:5:5:5

On R4

ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing

interface Loopback0
 no ip address
 ipv6 address 2004::4:4:4:4/128
!
interface Ethernet0/0
 no ip address
 ipv6 address 2001:172:16:34::4/64
 ipv6 enable
!
interface Ethernet0/1
 no ip address
 ipv6 address 2001:172:16:24::4/64
 ipv6 enable
!
interface Ethernet0/2
 no ip address
 ipv6 address 2001:172:16:14::4/64
 ipv6 enable

router eigrp CCIE
 !
 address-family ipv6 unicast autonomous-system 10
  !
  topology base
  exit-af-topology
  eigrp router-id 4.4.4.4
 exit-address-family

ipv6 pim rp-address 2005::5:5:5:5

On R5

ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing

interface Loopback0
 no ip address
 ipv6 address 2005::5:5:5:5/128
!
interface Ethernet0/3
 no ip address
 ipv6 address 2001:172:16:54::5/64
 ipv6 enable

router eigrp CCIE
 !
 address-family ipv6 unicast autonomous-system 10
  !
  topology base
  exit-af-topology
  eigrp router-id 5.5.5.5
 exit-address-family

ipv6 pim rp-address 2005::5:5:5:5

thanks a lot !!!

[Georg Pauwen]

Thanks, I'll lab this in GNS3 and get back with you...

[gongya001]

thanks so much !!

[gongya001]

Did you get a chance to lab in in GNS3 ?

thanks !!

[Harold Ritter]

The PIM are sent hop by hop from the first hop router (router next to the receiver) towards the RP. To troubleshoot this issue, you should start by doing a "show ipv6 mroute" on the first hop router (R2) and walking your way back to the RP. 

Regards,

[gongya001]

On the receiver:  I joined a group

Receiver#show run interface e0/0
Building configuration...

Current configuration : 121 bytes
!
interface Ethernet0/0
 no ip address
 ipv6 address 2001:192:166:1::7/64
 ipv6 enable
 ipv6 mld join-group FF0E::5

On R2

R2#show ipv6 mroute | b FF0E
(*, FF0E::5), 20:46:53/never, RP 2005::5:5:5:5, flags: SPC
  Incoming interface: Ethernet0/1
  RPF nbr: FE80::A8BB:CCFF:FE00:410
  Immediate Outgoing interface list:
    Ethernet0/0, Null, 20:46:53/never

On R4

ipv6 unicast-routing
ipv6 cef
ipv6 multicast-routing

interface Loopback0
 ipv6 address 2004::4:4:4:4/128

interface Ethernet0/1
 ipv6 address 2001:172:16:24::4/64
 ipv6 enable

interface Ethernet0/3
 ipv6 address 2001:172:16:54::4/64
 ipv6 enable

R4#show ipv6 mroute
No mroute entries found.

I don't any entry on R4.

thanks for help !!

[Harold Ritter · Accepted solution]

One thing I noticed is that your receiver is configred for IPv6 multicast-routing. I have seen it as causing issues in the past. The receiver should be just a host. Could you please do a "no ipv6 multicast-routing" on the receiver and see if you get better results.

Regards,

[gongya001]

It worked.

thanks a million !!