Users Guide

Protocol Ethernet Address
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 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.
Dell EMC Networking OS does not support multicast routing in the following VLT scenarios:
● In a VLT enabled PIM router, multicast routing is not supported when there are multiple PIM spanned paths to reach source
or RP. The workaround is to configure only one PIM spanned path to reach any PIM router in the aggregation or spine.
● If a source is connected to a non-spanned interface of the VLT peer nodes and the RP is reachable on a spanned interface
from both the VLT nodes, there is a possibility to receive duplicate traffic on the source. To avoid this, you should configure
the source to be reachable on a spanned 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.
596
Multicast Features