Brocade Communications Systems IPMC5000PEF manual Enabling Source-specific Multicast

Enabling Source-specific Multicast

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-rangeoption 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-prioritycommand 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-valuevariable 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:

174	FastIron Ethernet Switch IP Multicast Configuration Guide
	53-1003085-02