Edge-Core ECS4620-28P Cli Reference Manual page 1223

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This distributed election process provides faster convergence and minimal
disruption when an RP fails. It also serves to provide load balancing by
distributing groups across multiple RPs. Moreover, when an RP fails, the
responsible RPs are re-elected on each router, and the groups automatically
distributed to the remaining RPs.
◆
To improve failover recovery, it is advisable to select at least two core routers in
diverse locations, each to serve as both a candidate BSR and candidate RP. It is
also preferable to set up one of these routers as both the primary BSR and RP.
Example
The following example configures the router to start advertising itself to the BSR as
a candidate RP for the indicated multicast groups.
Console(config)#ipv6 pim rp-candidate interface vlan 1 group-prefix
FFAA::0101/8
Console(config)#end
Console#show ipv6 pim rp mapping
PIM Group-to-RP Mappings
Groups
RP address
Info source
Uptime
Expire
Console#
ipv6 pim
This command prevents the last-hop PIM router from switching to Shortest Path
Source Tree (SPT) mode. Use the no form to allow the router to switch over to SPT
spt-threshold
mode.
Syntax
ipv6 pim spt-threshold infinity [group-prefix group-prefix]
no ipv6 pim spt-threshold infinity
Default Setting
The last-hop PIM6 router joins the shortest path tree immediately after the first
packet arrives from a new source.
Command Mode
Global Configuration
Command Usage
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The default path for packets from a multicast source to a receiver is through the
RP. However, the path through the RP is not always the shortest path. Therefore,
the router uses the RP to forward only the first packet from a new multicast
: FF00::/8
: 2001:DB8:2222:7272::72/128
: 2001:DB8:2222:7272::72/128, via bootstrap, priority: 0
: 00:02:35
: 00:01:55
group-prefix - An IPv6 network prefix for a multicast group. If a group
address is not specified, the command applies to all multicast groups.
(Range: FFXX:X:X:X::X/<8-128>)
– 1223 –
Chapter 51
| Multicast Routing Commands
PIM Multicast Routing