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Clearing IPv6 multicast routing table

Sam Brynes
Beginner
Beginner

WIth IPv4 multicast, it's "clear ip mroute" *. I couldn't find a "clear ipv6 mroute *" command.

 

I tried using "clear ipv6 route multicast *", but that doesn't seem to have any effect:

 

R1#sh 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, Y - Joined MDT-data group,
y - Sending to MDT-data group
g - BGP signal originated, G - BGP Signal received,
N - BGP Shared-Tree Prune received, n - BGP C-Mroute suppressed,
q - BGP Src-Active originated, Q - BGP Src-Active received
E - Extranet
Timers: Uptime/Expires
Interface state: Interface, State

(2001:1:14:0:A8BB:CCFF:FE00:2010, FF08::2), 00:03:20/00:00:09, flags: SPFT
Incoming interface: Ethernet0/1
RPF nbr: FE80::A8BB:CCFF:FE00:2010
Outgoing interface list: Null

R1#clear ipv6 route multicast *
R1#sh 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, Y - Joined MDT-data group,
y - Sending to MDT-data group
g - BGP signal originated, G - BGP Signal received,
N - BGP Shared-Tree Prune received, n - BGP C-Mroute suppressed,
q - BGP Src-Active originated, Q - BGP Src-Active received
E - Extranet
Timers: Uptime/Expires
Interface state: Interface, State

(2001:1:14:0:A8BB:CCFF:FE00:2010, FF08::2), 00:03:23/00:00:06, flags: SPFT
Incoming interface: Ethernet0/1
RPF nbr: FE80::A8BB:CCFF:FE00:2010
Outgoing interface list: Null

R1#

 

Does anyone know if there's another command I should be using? Or if it for some reason does not clear out (S,G) entries?

2 REPLIES 2

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

 

try 'clear ipv6 route *. Below is the output of 'debug ipv6 multicast rpf' when this command is entered:

 

*Feb 16 09:48:19.721: IPV6 M-RPF: RPF lookup for 2012:AA:23::3
*Feb 16 09:48:19.722: IPV6 M-RPF: rwatch_info present. route = 0x0
reachable = RIB_RWATCH_UNREACHABLE, paths = 0
protocol = ????
*Feb 16 09:48:19.723: IPv6 M-RPF: RPF lookup failed, no match
*Feb 16 09:48:19.728: IPV6 M-RPF: RPF lookup for 2012:AA:23::3
*Feb 16 09:48:19.733: IPV6 M-RPF: rwatch_info present. route = 0xCAB3130
reachable = RIB_RWATCH_REACHABLE, paths = 1
protocol = ospf
*Feb 16 09:48:19.734: IPv6 M-RPF: non-MVPN recursive lookup: depth = 8
rpf_depth = 8, default depth = 8
*Feb 16 09:48:19.734: IPv6 M-RPF: ipmcast_ipv6_rw_nexthop_select
Attempting path selection on RW notif. info
R1#
*Feb 16 09:48:19.734: IPv6 M-RPF: ipmcast_ipv6_rw_nexthop_select
num_paths = 1 pathinfo = 0x10EC2178
*Feb 16 09:48:19.735: IPv6 M-RPF: No adjacency found for path 0 in route watch path array. Path next hop = 2012:AA:23::3
*Feb 16 09:48:19.737: IPv6 M-RPF: ipmcast_ipv6_rw_nexthop_select
Found an acceptable single path via GigabitEthernet0/1
*Feb 16 09:48:19.737: IPv6 M-RPF: Matched URIB route 2012:AA:23::/64 RPF-nbr 2012:AA:23::3, RPF-if GigabitEthernet0/1, metric 1, pref110,
R1#

Hi Georg,

Thanks for the suggestion. That didn't work for me. I wonder if doing "clear ipv6 route *" only refreshes the RPF interface on the IPv6 mroute entries?

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