Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 635
Implementation Information, Multicast Policies
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Implementation Information • Because protocol control traffic in FTOS is redirected using the MAC address, and multicast control traffic and multicast data traffic might map to the same MAC address, FTOS might forward data traffic with certain MAC addresses to the CPU in addition to control traffic. As the upper five bits of an IP Multicast address are dropped in the translation, 32 different multicast group IDs all map to the same Ethernet address. For example, 224.0.0.5 is a well known IP address for OSPF that maps to the multicast MAC address 01:00:5e:00:00:05. However, 225.0.0.5, 226.0.0.5, etc., map to the same multicast MAC address. The Layer 2 FIB alone cannot differentiate multicast control traffic multicast data traffic with the same address, so if you use IP address 225.0.0.5 for data traffic, both the multicast data and OSPF control traffic match the same entry and are forwarded to the CPU. Therefore, do not use well-known protocol multicast addresses for data transmission, such as the ones below. Protocol Ethernet Address OSPF 01:00:5e:00:00:05 01:00:5e:00:00:06 RIP 01:00:5e:00:00:09 NTP 01:00:5e:00:01:01 VRRP 01:00:5e:00:00:12 PIM-SM 01:00:5e:00:00:0d • The FTOS implementation of MTRACE is in accordance with IETF draft draft-fenner-traceroute-ipm. • Multicast is not supported on secondary IP addresses. • Egress L3 ACL is not applied to multicast data traffic if multicast routing is enabled. Multicast Policies FTOS offers parallel Multicast features for IPv4 and IPv6. • IPv4 Multicast Policies • IPv6 Multicast Policies IPv4 Multicast Policies • Limit the Number of Multicast Routes • Prevent a Host from Joining a Group • Rate Limit IGMP Join Requests • Prevent a PIM Router from Forming an Adjacency • Prevent a Source from Registering with the RP • Prevent a PIM Router from Processing a Join Multicast Features | 635
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