UMN:CLI
User Manual
V8102
588
Command
Mode
Description
timer assert
[
at
]
no debug ipv6 pim
sparse-mode
timer
bsr
[
bst
|
crp
]
no debug ipv6 pim
sparse-mode
timer hello
[
ht
|
nlt
|
tht
]
no debug ipv6 pim
sparse-mode
timer joinprune
[
jt
|
et
|
ppt
|
kat
|
ot
]
no debug ipv6 pim
sparse-mode
timer register
[
rst
]
To display the contents of the running configuration, use the following command.
Command
Mode
Description
show running-config ipv6 pim
dense-mode
Enable
Global
Shows the running configuration of dense-mode (PIM-
DM) for IPv6.
show running-config ipv6 pim
sparse-mode
Shows the running configuration of sparse-mode (PIM-
SM) for IPv6.
11.3.9
Source Specific Multicast (SSM)
Multicast supports both many-to-many and one-to-many models, which are also known
as Any Source Multicast (ASM). In this model, receivers may join and leave multicast
groups with (*, G) state that indicates any source and group G. Since there is no means to
specify the source
’s information, source discovery such as the RP mechanism in PIM-SM
is needed, which is the key feature of ASM. IPv6 multicast address have the prefix ff00::/8.
Source-Specific Multicast (SSM) is especially suit for one-to-many multicast network. In
the SSM service model, receivers can receive multicast traffic by subscribing to channel
(S, G) that indicates specific IPv6 unicast source S and multicast group address G.
Since SSM assumes that receivers already know the source
’s information, no further
source discovery is provided. Thus, receivers need to know the source
’s information us-
ing an out of band mechanism. The SSM group address range is defined as ff33::/32 ~
ff3f::/21 by default.
11.3.9.1
PIMv6-SSM
PIM Source-Specific Multicast (PIM-SSM) is a subset of PIM-SM. It is much simpler than
PIM-SM, because it only considers one-to-many multicast service model. PIM-SSM only
use a shortest path tree (SPT) to deliver multicast traffic, so the PIM-SM
’s complex
mechanisms such as RP, BSR, SPT switchover and a shared tree are not necessary any
more. PIM-SSM uses the same PIM messages as PIM-SM
’s for its operation.
If all routers are configured with PIM-SM and MLDv2, only by using the
ipv6 pim ssm
command, PIM-SSM will be enabled. You can also define an additional SSM group other
than the default SSM group range.
