PIMv6

PIMv6 – Protocol Independent Multicast for IPv6

pim6d supports pim-sm as well as MLD v1 and v2. PIMv6 is vrf aware and can work within the context of vrf’s in order to do S,G mrouting.

Starting and Stopping pim6d

The default configuration file name of pim6d’s is pim6d.conf. When invoked pim6d searches directory /etc/frr. If pim6d.conf is not there then next search current directory.

pim6d requires zebra for proper operation. Additionally pim6d depends on routing properly setup and working in the network that it is working on.

# zebra -d
# pim6d -d

Please note that zebra must be invoked before pim6d.

To stop pim6d please use:

kill `cat /var/run/pim6d.pid`

Certain signals have special meanings to pim6d.

Signal

Meaning

SIGUSR1

Rotate the pim6d logfile

SIGINT SIGTERM

pim6d sweeps all installed PIM mroutes then terminates gracefully.

pim6d invocation options. Common options that can be specified (Common Invocation Options).

ipv6 pim rp X:X::X:X Y:Y::Y:Y/M

In order to use pimv6, it is necessary to configure a RP for join messages to be sent to. Currently the only methodology to do this is via static rp commands. All routers in the pimv6 network must agree on these values. The first ipv6 address is the RP’s address and the second value is the matching prefix of group ranges covered. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 pim rp X:X::X:X prefix-list WORD

This CLI helps in configuring RP address for a range of groups specified by the prefix-list.

ipv6 pim rp keep-alive-timer (1-65535)

Modify the time out value for a S,G flow from 1-65535 seconds at RP. The normal keepalive period for the KAT(S,G) defaults to 210 seconds. However, at the RP, the keepalive period must be at least the Register_Suppression_Time, or the RP may time out the (S,G) state before the next Null-Register arrives. Thus, the KAT(S,G) is set to max(Keepalive_Period, RP_Keepalive_Period) when a Register-Stop is sent. If choosing a value below 31 seconds be aware that some hardware platforms cannot see data flowing in better than 30 second chunks. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 pim spt-switchover infinity-and-beyond [prefix-list PLIST]

On the last hop router if it is desired to not switch over to the SPT tree configure this command. Optional parameter prefix-list can be use to control which groups to switch or not switch. If a group is PERMIT as per the PLIST, then the SPT switchover does not happen for it and if it is DENY, then the SPT switchover happens. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 pim join-prune-interval (1-65535)

Modify the join/prune interval that pim uses to the new value. Time is specified in seconds. This command is vrf aware, to configure for a vrf, enter the vrf submode. The default time is 60 seconds. If you enter a value smaller than 60 seconds be aware that this can and will affect convergence at scale.

ipv6 pim keep-alive-timer (1-65535)

Modify the time out value for a S,G flow from 1-65535 seconds. If choosing a value below 31 seconds be aware that some hardware platforms cannot see data flowing in better than 30 second chunks. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 pim packets (1-255)

When processing packets from a neighbor process the number of packets incoming at one time before moving on to the next task. The default value is 3 packets. This command is only useful at scale when you can possibly have a large number of pim control packets flowing. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 pim register-suppress-time (1-65535)

Modify the time that pim will register suppress a FHR will send register notifications to the kernel. This command is vrf aware, to configure for a vrf, enter the vrf submode.

ipv6 ssmpingd [X:X::X:X]

Enable ipv6 ssmpingd configuration. A network level management tool to check whether one can receive multicast packets via SSM from host. The host target given to ssmping must run the ssmpingd daemon which listens for IPv4 and IPv6 unicast requests. When it receives one, it responds to a well known SSM multicast group which ssmping just have joined.

PIMv6 Interface Configuration

PIMv6 interface commands allow you to configure an interface as either a Receiver or a interface that you would like to form pimv6 neighbors on. If the interface is in a vrf, enter the interface command with the vrf keyword at the end.

ipv6 pim active-active

Turn on pim active-active configuration for a Vxlan interface. This command will not do anything if you do not have the underlying ability of a mlag implementation.

ipv6 pim drpriority (1-4294967295)

Set the DR Priority for the interface. This command is useful to allow the user to influence what node becomes the DR for a lan segment.

ipv6 pim hello (1-65535) (1-65535)

Set the pim hello and hold interval for a interface.

ipv6 pim

Tell pim that we would like to use this interface to form pim neighbors over. Please note that this command does not enable the reception of MLD reports on the interface. Refer to the next ipv6 mld command for MLD management.

ipv6 pim use-source X:X::X:X

If you have multiple addresses configured on a particular interface and would like pim to use a specific source address associated with that interface.

ipv6 pim passive

Disable sending and receiving pim control packets on the interface.

ipv6 mld

Tell pim to receive MLD reports and Query on this interface. The default version is v2. This command is useful on a LHR.

ipv6 mld join X:X::X:X [Y:Y::Y:Y]

Join multicast group or source-group on an interface.

ipv6 mld query-interval (1-65535)

Set the MLD query interval that PIM will use.

ipv6 mld query-max-response-time (1-65535)

Set the MLD query response timeout value. If an report is not returned in the specified time we will assume the S,G or *,G has timed out.

ipv6 mld version (1-2)

Set the MLD version used on this interface. The default value is 2.

ipv6 multicast boundary oil WORD

Set a PIMv6 multicast boundary, based upon the WORD prefix-list. If a PIMv6 join or MLD report is received on this interface and the Group is denied by the prefix-list, PIMv6 will ignore the join or report.

ipv6 mld last-member-query-count (1-255)

Set the MLD last member query count. The default value is 2. ‘no’ form of this command is used to configure back to the default value.

ipv6 MLD last-member-query-interval (1-65535)

Set the MLD last member query interval in deciseconds. The default value is 10 deciseconds. ‘no’ form of this command is used to to configure back to the default value.

ipv6 mroute INTERFACE X:X::X:X [Y:Y::Y:Y]

Set a static multicast route for a traffic coming on the current interface to be forwarded on the given interface if the traffic matches the group address and optionally the source address.

Show PIMv6 Information

All PIMv6 show commands are vrf aware and typically allow you to insert a specified vrf command if information is desired about a specific vrf. If no vrf is specified then the default vrf is assumed. Finally the special keyword ‘all’ allows you to look at all vrfs for the command. Naming a vrf ‘all’ will cause great confusion.

PIM protocol state

show ipv6 pim [vrf NAME] group-type [json]

Display SSM group ranges.

show ipv6 pim interface

Display information about interfaces PIM is using.

show ipv6 pim [vrf NAME] join [X:X::X:X [X:X::X:X]] [json]
show ipv6 pim vrf all join [json]

Display information about PIM joins received. If one address is specified then we assume it is the Group we are interested in displaying data on. If the second address is specified then it is Source Group.

show ipv6 pim [vrf NAME] local-membership [json]

Display information about PIM interface local-membership.

show ipv6 pim [vrf NAME] neighbor [detail|WORD] [json]
show ipv6 pim vrf all neighbor [detail|WORD] [json]

Display information about PIM neighbors.

show ipv6 pim [vrf NAME] nexthop

Display information about pim nexthops that are being used.

show ipv6 pim [vrf NAME] nexthop-lookup X:X::X:X X:X::X:X

Display information about a S,G pair and how the RPF would be chosen. This is especially useful if there are ECMP’s available from the RPF lookup.

show ipv6 pim [vrf NAME] rp-info [json]
show ipv6 pim vrf all rp-info [json]

Display information about RP’s that are configured on this router.

show ipv6 pim [vrf NAME] rpf [json]
show ipv6 pim vrf all rpf [json]

Display information about currently being used S,G’s and their RPF lookup information. Additionally display some statistics about what has been happening on the router.

show ipv6 pim [vrf NAME] secondary

Display information about an interface and all the secondary addresses associated with it.

show ipv6 pim [vrf NAME] state [X:X::X:X [X:X::X:X]] [json]
show ipv6 pim vrf all state [X:X::X:X [X:X::X:X]] [json]

Display information about known S,G’s and incoming interface as well as the OIL and how they were chosen.

show ipv6 pim [vrf NAME] upstream [X:X::X:X [Y:Y::Y:Y]] [json]
show ipv6 pim vrf all upstream [json]

Display upstream information about a S,G mroute. Allow the user to specify sub Source and Groups that we are interested in.

show ipv6 pim [vrf NAME] upstream-join-desired [json]

Display upstream information for S,G’s and if we desire to join the multicast tree

show ipv6 pim [vrf NAME] upstream-rpf [json]

Display upstream information for S,G’s and the RPF data associated with them.

MLD state

show ipv6 mld [vrf NAME] interface [IFNAME] [detail|json]

Display per-interface MLD state, elected querier and related timers. Use the detail or json options for further information (the JSON output always contains all details.)

show ipv6 mld [vrf NAME] statistics [interface IFNAME] [json]

Display packet and error counters for MLD interfaces. All counters are packet counters (not bytes) and wrap at 64 bit. In some rare cases, malformed received MLD reports may be partially processed and counted on multiple counters.

show ipv6 mld [vrf NAME] joins [{interface IFNAME|groups X:X::X:X/M|sources X:X::X:X/M|detail}] [json]

Display joined groups tracked by MLD. interface, groups and sources options may be used to limit output to a subset (note sources refers to the multicast traffic sender, not the host that joined to receive the traffic.)

The detail option also reports which hosts have joined (subscribed) to particular S,G. This information is only available for MLDv2 hosts with a MLDv2 querier. MLDv1 joins are recorded as “untracked” and shown in the NonTrkSeen output column.

General multicast routing state

show ipv6 multicast

Display various information about the interfaces used in this pim instance.

show ipv6 multicast count [vrf NAME] [json]

Display multicast data packets count per interface for a vrf.

show ipv6 multicast count vrf all [json]

Display multicast data packets count per interface for all vrf.

show ipv6 mroute [vrf NAME] [X:X::X:X [X:X::X:X]] [fill] [json]

Display information about installed into the kernel S,G mroutes. If one address is specified we assume it is the Group we are interested in displaying data on. If the second address is specified then it is Source Group. The keyword fill says to fill in all assumed data for test/data gathering purposes.

show ipv6 mroute [vrf NAME] count [json]

Display information about installed into the kernel S,G mroutes and in addition display data about packet flow for the mroutes for a specific vrf.

show ipv6 mroute vrf all count [json]

Display information about installed into the kernel S,G mroutes and in addition display data about packet flow for the mroutes for all vrfs.

show ipv6 mroute [vrf NAME] summary [json]

Display total number of S,G mroutes and number of S,G mroutes installed into the kernel for a specific vrf.

show ipv6 mroute vrf all summary [json]

Display total number of S,G mroutes and number of S,G mroutes installed into the kernel for all vrfs.

PIMv6 Debug Commands

The debugging subsystem for PIMv6 behaves in accordance with how FRR handles debugging. You can specify debugging at the enable CLI mode as well as the configure CLI mode. If you specify debug commands in the configuration cli mode, the debug commands can be persistent across restarts of the FRR pim6d if the config was written out.

PIMv6 Clear Commands

Clear commands reset various variables.

clear ipv6 mroute

Reset multicast routes.

clear ipv6 mroute [vrf NAME] count

When this command is issued, reset the counts of data shown for packet count, byte count and wrong interface to 0 and start count up from this spot.

clear ipv6 pim oil

Rescan PIMv6 OIL (output interface list).