Multicast Policies; Ipv4 Multicast Policies - Dell Force10 S4810P Configuration Manual

Multicast Policies

FTOS offers parallel Multicast features for IPv4 and IPv6.
• IPv4 Multicast Policies on page 712
• IPv6 Multicast Policies on page 717

IPv4 Multicast Policies

• Limit the Number of Multicast Routes on page 712
• Prevent a Host from Joining a Group on page 713
• Rate Limit IGMP Join Requests on page 715
• Prevent a PIM Router from Forming an Adjacency on page 715
• Prevent a Source from Registering with the RP on page 715
• Prevent a PIM Router from Processing a Join on page 717
Limit the Number of Multicast Routes
Task
Limit the total number of multicast routes on the system.
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
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 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.
712
| Multicast Features
Command Syntax
ip multicast-limit
Range: 1-50000
Default: 15000
clear ip mroute
Message 1.
Command Mode
CONFIGURATION
).