Brocade FastIron Ethernet Switch IP Multicast Configuration Guide - Manual (Page 176)

Enabling Source-specific Multicast
Using the Any-Source Multicast (ASM) service model, sources and receivers register with a multicast
address. The protocol uses regular messages to maintain a correctly configured broadcast network
where all sources can send data to all receivers and all receivers get broadcasts from all sources.
With Source-specific Multicast (SSM), the "channel" concept is introduced where a "channel" consists
of a single source and multiple receivers that specifically register to get broadcasts from that source.
Consequently, receivers are not burdened with receiving data they have no interest in, and network
bandwidth requirements are reduced because the broadcast need only go to a subset of users. The
address range ff30:/12 has been assigned by the Internet Assigned Numbers Authority (IANA) for use
with SSM.
SSM simplifies IPv6 PIM-SM by eliminating the RP and all protocols related to the RP.
Configuring Source-specific Multicast
IPv6 PIM-SM must be enabled on any ports on which you want SSM to operate. Enter the ssm-
enable command under the IPv6 router PIM level to globally enable SSM filtering.
device(config)# ipv6 router pim
device(config-ipv6-pim-router)# ssm-enable
To enable SSM for a specified VRF and user-defined address range, enter the commands as shown in
the following.
device(config)# ipv6 router pim vrf blue
device(config-ipv6-pim-router-vrf-blue)# ssm-enable ff44::/32
Syntax: [no] ssm-enable [ range address-range ]
The rangeaddress-range option allows you to define the SSM range of IPv6 multicast addresses.
Configuring a DR priority
The DR priority option lets a network administrator give preference to a particular router in the DR
election process by giving it a numerically higher DR priority. To set a DR priority higher than the
default value of 1, use the ipv6 pim dr-priority command as shown in the example below.
device(config-if-e10000-3/24)# ipv6 pim dr-priority 50
To set a DR priority higher than the default value of 1 on a virtual Ethernet interface, use the ipv6 pim
dr-priority command as shown in the following.
device(config)# interface ve 10
device(config-vif-10)# ipv6 pim dr-priority 50
Syntax: [no] ipv6 pim dr-priority priority-value
The priority-value variable is the value that you want to set for the DR priority. The range of values is
from 0 through 65535. The default value is 1.
The no option removes the command and sets the DR priority back to the default value of 1.
The following information may be useful for troubleshooting:
Enabling Source-specific Multicast
174 FastIron Ethernet Switch IP Multicast Configuration Guide
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