Dell Force10 S4820T S4820T Configuration Guide - Page 678

www.dell.com | support.dell.com Multicast Policies FTOS offers parallel Multicast features for IPv4 and IPv6. • IPv4 Multicast Policies on page 678 • IPv6 Multicast Policies on page 683 IPv4 Multicast Policies • Limit the Number of Multicast Routes on page 678 • Prevent a Host from Joining a Group on page 679 • Rate Limit IGMP Join Requests on page 681 • Prevent a PIM Router from Forming an Adjacency on page 681 • Prevent a Source from Registering with the RP on page 681 • Prevent a PIM Router from Processing a Join on page 683 Limit the Number of Multicast Routes Task Command Syntax Limit the total number of multicast routes on the system. ip multicast-limit Range: 1-50000 Default: 15000 Command Mode CONFIGURATION When the limit is reached, FTOS does not process any IGMP or MLD joins to 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 MSDP. • If the limit is increased after it is reached, join subsequent join requests are accepted. In this case, you must increase the limit by at least 10% for IGMP and MLD to resume. • If the limit is decreased after it is reached, FTOS does not clear the existing sessions. Entries are cleared upon a timeout (you may also clear entries using clear ip mroute). Note: FTOS 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, FTOS displays Message 1. Message 1 Multicast Route Limit Error 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. 678 | Multicast Features