
Configuring IPv6 PIM
Configuring PIM
page 6-40
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
March 2011
Elected BSR = False,
Timer
= 00h:00m:00s
For more information about these displays, see the “PIM Commands” chapter in the
OmniSwitch CLI
Reference Guide
.
Bootstrap Routers (BSRs)
As described in the
“PIM Overview”
section, the role of a Bootstrap Router (BSR) is to keep routers in the
network “up to date” on reachable Candidate Rendezvous Points (C-RPs). BSRs are elected from a set of
Candidate Bootstrap Routers (C-BSRs). Refer to
page 6-9
for more information on C-BSRs.
Reminder.
For correct operation, all IPv6 PIM-SM routers within an IPv6 PIM-SM domain must be able
to map a particular multicast group address to the same Rendezvous Point (RP). PIM-SM provides two
methods for group-to-RP mapping. One method is the Bootstrap Router mechanism, which also involves
C-RP advertisements, as described in this section; the other method is static RP configuration. Note that, if
static RP configuration is enabled, the Bootstrap mechanism and C-RP advertisements
are automatically
disabled
. For more information on static RP status and configuration, refer to “Configuring Static RP
Groups” below.
A C-RP periodically sends out messages, known as
C-RP advertisements
. When a BSR receives one of
these advertisements, the associated C-RP is considered reachable (if a valid route to the network exists).
The BSR then periodically sends an updated list of reachable C-RPs to all neighboring routers in the form
of a
Bootstrap message
.
Note.
The list of reachable C-RPs is also referred to as an
RP set
. To view the current RP set, use the
show ipv6 pim group-map
command. For example:
-> show ipv6 pim group-map
Origin Group Address/Pref Length RP Address Mode Precedence
---------+---------------------------+-------------+-----+-----------
BSR ff00::/8 3000::11 asm 192
BSR ff00::/8 4000::7 asm 192
SSM ff33::/32 ssm
For more information about these displays, see the “PIM Commands” chapter in the
OmniSwitch CLI
Reference Guide
.
Note.
There is only one BSR per IPv6 PIM-SM domain within the default scope. This allows all IPv6
PIM-SM routers in the IPv6 PIM-SM domain to view the same list of reachable C-RPs.
Configuring Static RP Groups for IPv6 PIM
A static RP group is used in the group-to-RP mapping algorithm. To specify a static RP group, use the
ipv6 pim static-rp
command. Be sure to enter a multicast group address, a corresponding group mask, and
a 128-bit IPv6 address for the static RP in the command line. For example:
-> ipv6 pim static-rp ff0e::1234/128 2000::1 priority 10
This command entry maps all multicast groups ff0e::1234/128 to the static RP 2000::1 and specifies the
priority value to be used for the static RP configuration as 10. This priority value provides fine control