Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 600

Protocol OSPF Ethernet Address 01:00:5e:00:00:05 01:00:5e:00:00:06 RIP NTP VRRP PIM-SM 01:00:5e:00:00:09 01:00:5e:00:01:01 01:00:5e:00:00:12 01:00:5e:00:00:0d • The Dell EMC Networking OS implementation of MTRACE is in accordance with IETF draft draft-fenner-traceroute-ipm. • Multicast is not supported on secondary IP addresses. • If you enable multicast routing, egress Layer 3 ACL is not applied to multicast data traffic. • Multicast traffic can be forwarded to a maximum of 15 VLANs with the same outgoing interface. Multicast Policies The Dell EMC Networking OS supports multicast features for IPv4. IPv4 Multicast Policies The following sections describe IPv4 multicast policies. • Limiting the Number of Multicast Routes • Preventing a Host from Joining a Group • Preventing a PIM Router from Forming an Adjacency • Preventing a Source from Registering with the RP • Preventing a PIM Router from Processing a Join Limiting the Number of Multicast Routes When the total number of multicast routes on a system limit is reached, the Dell EMC Networking OS does not process Internet group management protocol (IGMP) or multicast listener discovery protocol (MLD) joins to protocol-independent multicast (PIM) - though it still processes leave messages - until the number of entries decreases below 95% of the limit. When the limit falls below 95% after hitting the maximum, the system begins relearning route entries through IGMP, MLD, and multicast source discovery protocol (MSDP). • If you increase the limit after it is reached, subsequent join requests are accepted. In this case, increase the limit by at least 10% for IGMP and MLD to resume. • If you decrease the limit after it is reached, the Dell EMC Networking OS does not clear the existing sessions. Entries are cleared after a timeout (you may also clear entries using the clear ip mroute command). NOTE: The Dell EMC Networking OS waits at least 30 seconds between stopping and starting IGMP join processing. You may experience this delay when manipulating the limit after it is reached. When the multicast route limit is reached, the following displays: 3w1d13h: %RPM0-P:RP2 %PIM-3-PIM_TIB_LIMIT: PIM TIB limit reached. No new routes will be learnt until TIB level falls below low watermark. 3w1d13h: %RPM0-P:RP2 %PIM-3-PIM_TIB_LIMIT: PIM TIB below low watermark. Route learning will begin. To limit the number of multicast routes, use the following command. 600 Multicast Features