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The Passport 8600 supports static source groups using one of several multicast protocols: DVMRP, PIM-SM (sparse mode), and PIM-SSM (source specific multicast). Before you can configure a static source group, you must globally enable one of the following protocols:
After configuring static source groups, keep the following points in mind:
| In DVMRP and PIM-SM configurations, the static source-group feature works for both specific source addresses and subnet addresses. This is achieved by using the SrcSubnetMask field (refer to "Adding a new static source group"). |
| When the Network Mask is configured as 255.255.255.255, the full source address is used to match the (S,G) which is the specific source case. When the network mask field is configured as a subnet mask for the source, only the source subnet is used to match (S,G)s. |
| In PIM-SSM configurations, static source groups have the following limitations: |
| | Subnets - SSM static source groups work only with specific IP addresses. This means that static source groups cannot work with source subnets so the mask must be a full 32-bit mask, 255.255.255.255, and the source has to be a host address. |
| SSM Channels - Static source groups cannot conflict with SSM channels and vice versa. When you configure a static source group or an SSM channel, the switch performs a consistency check to make sure there are no conflicts. You cannot map one group (G) to different sources for both a static source group and an SSM channel. If a group is already mapped to a source and you try to map it to a different source, the switch detects the conflict and displays an error message. For example, if G1 is already defined in the SSM channel table as (S1,G1), you cannot configure G1 as static source group (S2,G1). However, you can configure the same entry (S1,G1) in both the SSM channel table and as a static source group. As long as there is no conflict between the two tables, the configuration is allowed. |
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