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Cisco Employee

Ipv6 multicast

Please see the output of these cmds:

sup3-AB5-mal8v6#sho ipv6 mroute

Multicast Routing Table

Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group,

C - Connected, L - Local, I - Received Source Specific Host Report,

P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set,

J - Join SPT

Timers: Uptime/Expires

Interface state: Interface, State

(*, FF1E::1), 20:25:11/never, RP ::, flags: SCJ

Incoming interface: Null

RPF nbr: ::

Immediate Outgoing interface list:

TenGigabitEthernet2/1, Forward, 20:25:11/never

(3005::2, FF1E::1), 01:30:54/00:00:50, flags: SFJT

Incoming interface: TenGigabitEthernet2/5

RPF nbr: 3005::2

Inherited Outgoing interface list:

TenGigabitEthernet2/1, Forward, 20:25:11/never

sup3-AB5-mal8v6#Sho ipv6 pim topology

IP PIM Multicast Topology Table

Entry state: (*/S,G)[RPT/SPT] Protocol Uptime Info

Entry flags: KAT - Keep Alive Timer, AA - Assume Alive, PA - Probe Alive,

RA - Really Alive, LH - Last Hop, DSS - Don't Signal Sources,

RR - Register Received, SR - Sending Registers, E - MSDP External,

DCC - Don't Check Connected

Interface state: Name, Uptime, Fwd, Info

Interface flags: LI - Local Interest, LD - Local Disinterest,

II - Internal Interest, ID - Internal Disinterest,

LH - Last Hop, AS - Assert, AB - Admin Boundary


SM UP: 20:25:54 JP: Join(now) Flags: LH

RP: ::

RPF: ,::

Te2/1 20:25:54 fwd LI LH


SM SPT UP: 01:31:38 JP: Join(never) Flags: KAT(00:03:12) RA

RPF: TenGigabitEthernet2/5,3005::2*

No interfaces in immediate olist

My question is int t2/1 is joining group ff1e::1 which is being shown correctly in the output of "show ipv6 mroute" but in the output "ipv6 pim toplogy" it says "No interfaces in immediate olist"

Can someone tell why this is so..



Cisco Employee

Re: Ipv6 multicast

It is normal for the interface not to show up in the olist of a (S,G) entry in the PIM topology table as per the following documentation excerpt:

"For example, an interface is added to (*,G) entry in PIM topology table upon receipt of an MLD report or PIM (*,G) join message. Similarly, an interface is added to (S,G) entry upon receipt of MLD INCLUDE report for S and G or PIM (S,G) join message. Then PIM installs an (S,G) entry in MRIB with immediate olist (from (S,G)) and inherited olist (from (*,G)). Therefore, the proper forwarding state for a given entry (S,G) can be seen only in the MRIB or the MFIB, not in the PIM topology table."

For a full description of the "show ipv6 pim topology" command:

Use the "show ipv6 mrib route" or "show ipv6 mfib" to get the right information for the specific (S,G).

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
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