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DES-7200 Configuration Guide Chapter 1 IPv4 Multicast
Configuration
1-6
Command Purpose
DES-7200 (config) # ip multicast
route-limit limit [threshold]
Limit the number of entries to be added in
the multicast routing table.
limit: Number of entries to be added in the
multicast routing table in the range of 1 to
2147483647, and 1024 by default.
threshold (optional): Number of routes
triggering an alert message, 2147483647
by default.
Note: As the hardware is limit for different
models, the multicast packets beyond the
hardware forwarding table will be
forwarded by the software. This will occupy
CPU and sacrifice system performance.
1.3.3 Configuring IPv4 Multicast Boundary
Use the ip multicast boundary access-list command to configure the interface
as the multicast boundary of a specific IP group in the interface configuration
mode and use the no ip multicast boundary command to restore the default
value.
Command Purpose
DES-7200 (config-if) # ip multicast
boundary access-list {in | out}
Configuring the IPv4 Multicast Boundary of
the specific IP group. Numerical standard
ACL or name can be used to specify an IP
group.
Note that The ACL in this command is
specific for matching destination IP
address, not group IP address and source
IP address.
This command filters the IGMP, PIM-SM and PIM-DM packets associated with the
IP group. Multicast packets will not flow in and out from the multicast boundary.
1.3.4 Configuring IPv4 Multicast Static Route
It is the multicast static route that makes multicast forwarding path differ from
unicast path. RPF check is always executed for forwarding multicast packets. The
actual receiving port is the port expected to receive packets (the port is the next
hop of unicast route reaching the sender). RPF check is reasonable if the
topologies of unicast and multicast are the same. But in some cases, unicast path
is expected to differ from that of multicast.
Configuring multicast static route allows for RPF check based on configuration,
not the unicast routing table. Consequently, multicast packets are forwarded
through tunnel. Unicast packets are not. Multicast static route is configured locally.
It will not be advertised or forwarded.
In the global configuration mode, use the following command to configure
multicast static route.
Command Purpose
DES-7200 (config) # ip mroute
source-address mask [bgp | isis | ospf |
static] {v4rpf-address | interface-type
interface-number} [distance]
Configure multicast static route and specify
the routing protocol type.
distance: In the range of 1 to 255