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Configuring PIM Configuring IPv6 PIM
OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007 page 7-41
Note. If static RP status is specified, the method for group-to-RP mapping provided by the Bootstrap
mechanism and C-RP advertisements is automatically disabled. For more information on this alternate
method of group-to-RP mapping, refer to page 7-26.
To view current Static RP Configuration settings, use the show ipv6 pim static-rp command.
Group-to-RP Mapping
Using one of the mechanisms described in the sections above, an IPv6 PIM-SM router receives one or
more possible group-range-to-RP mappings. Each mapping specifies a range of IPv6 multicast groups
(expressed as a group and mask), as well as the RP to which such groups should be mapped. Each
mapping may also have an associated priority. It is possible to receive multiple mappings—all of which
might match the same multicast group. This is the common case with the BSR mechanism. The algorithm
for performing the group-to-RP mapping is as follows:
1 Perform longest match on group-range to obtain a list of RPs.
2 From this list of matching RPs, find the one with the highest priority. Eliminate any RPs from the list
that have lower priorities.
3 If only one RP remains in the list, use that RP.
4 If multiple RPs are in the list, use the PIM-SM hash function defined in the RFC to choose one. The
RP with the highest resulting hash value is then chosen as the RP. If more than one RP has the same high-
est hash value, then the RP with the highest IPv6 address is chosen.
This algorithm is invoked by a DR when it needs to determine an RP for a given group, such as when
receiving a packet or an IGMP membership indication.
Configuring RP-Switchover for IPv6 PIM
You can configure an RP to attempt switching to native forwarding upon receiving the first register-encap-
sulated packet from the source DR in the IPv6 PIM domain. For example:
-> ipv6 pim rp-switchover enable
The above command enables the RP to switch to native forwarding.
-> ipv6 pim rp-switchover disable
The above command disables the RP from switching to native forwarding.
By default, this capability is enabled. You cannot specify a pre-configured threshold, such as the RP
threshold, as you would do for IPv4 PIM.