Configuration considerations
- IGAP can be enabled on IGMPv2 interfaces only.
- IGAP uses the Fast Leave feature exclusively to save bandwidth and enhance the network's efficiency. This feature cannot be disabled.
- Since IGAP uses Fast Leave, it never sends group-specific Query messages in response to a Leave message or use the IGMP Last Member Query Interval (LMQI) parameter.
- Nortel Networks does not recommend using static IGMP members on IGAP-enabled interfaces. Functionally, this means that the Passport 8600 will still send traffic to the member ports of the static multicast group, but it will not authenticate users or account for their traffic usage.
- The Passport 8600 supports IGAP in PIM-SM (sparse mode) only, and not for PIM-SSM (source specific multicast) or DVMRP.
- IGAP does not support spanning VLANs.
- Nortel Networks recommends that you do not use static (or block) IGMP member ports.
