Dell S4048T, Configuration Manual

Page: 687 / 1277

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 Dell 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 Policies
The Dell 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 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 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 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.
Multicast Features 687