Protocol Independent Multicast - Cisco ASR 9000 Series Configuration Manual

Protocol Independent Multicast

<max>
<threshold>
<acl>
the ACL is accounted against the limit. Groups or (S, G)s that are denied by the ACL are not accounted against
the limit. If not provided, all the groups are accounted against the limit.
The following messages are displayed when the threshold limit is reached for IGMP:
igmp[1160]: %ROUTING-IPV4_IGMP-4-OOR_THRESHOLD_REACHED : Threshold for Maximum number of
group per interface has been reached 3: Groups joining will soon be throttled.
Config a higher max or take steps to reduce states
igmp[1160]: %ROUTING-IPV4_IGMP-4-OOR_LIMIT_REACHED : Maximum number of group per interface
has been reached 6: Groups joining is throttled.
Config a higher max or take steps to reduce states
Limitations
• If a user has configured a maximum of 20 groups and has reached the maximum number of groups, then
• If a user already has configured a maximum of 30 joins and add a max of 20, the configuration occurs
Protocol Independent Multicast
Protocol Independent Multicast (PIM) is a routing protocol designed to send and receive multicast routing
updates. Proper operation of multicast depends on knowing the unicast paths towards a source or an RP. PIM
relies on unicast routing protocols to derive this reverse-path forwarding (RPF) information. As the name
PIM implies, it functions independently of the unicast protocols being used. PIM relies on the Routing
Information Base (RIB) for RPF information.
If the multicast subsequent address family identifier (SAFI) is configured for Border Gateway Protocol (BGP),
or if multicast intact is configured, a separate multicast unicast RIB is created and populated with the BGP
multicast SAFI routes, the intact information, and any IGP information in the unicast RIB. Otherwise, PIM
gets information directly from the unicast SAFI RIB. Both multicast unicast and unicast databases are outside
of the scope of PIM.
The Cisco IOS XR implementation of PIM is based on RFC 4601 Protocol Independent Multicast - Sparse
Mode (PIM-SM): Protocol Specification. For more information, see RFC 4601 and the Protocol Independent
Multicast (PIM): Motivation and Architecture Internet Engineering Task Force (IETF) Internet draft.
Cisco IOS XR Software supports PIM-SM, PIM-SSM, and PIM Version 2 only. PIM Version 1 hello
Note
messages that arrive from neighbors are rejected.
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 6.0.x
80
is the maximum limit on the groups
is the threshold number of groups at which point a syslog warning message will be issued
provides an option for selective accounting. If provided, only groups or (S,G)s that are permitted by
no more groups can be created. If the user reduces the maximum number of groups to 10, the 20 joins
will remain and a message of reaching the maximum is displayed. No more joins can be added until the
number of groups has reached less than 10.
displaying a message that the maximum has been reached. No state change occurs and also no more
joins can occur until the threshold number of groups is brought down below the maximum number of
groups.
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software