HP VPN Firewall Appliances Network Management Configuration Guide

565
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface interface-type interface-number N/A
3. Configure a multicast
forwarding boundary.
multicast boundary group-address { mask |
mask-length }
No forwarding boundary
by default.
Configuring the multicast forwarding table size
The router maintains the corresponding forwarding entry for each multicast packet that it receives.
However, excessive multicast routing entries can exhaust the router's memory and cause lower
performance.
You can set the maximum number of entries in the multicast forwarding table according to the networking
situation and the performance requirements. If the configured upper limit is smaller than the number of
existing entries in the multicast forwarding table, the entries in excess are not deleted immediately. The
multicast routing protocol that runs on the router will delete them. The router will no longer add new
multicast forwarding entries until the number of existing multicast forwarding entries decreases below the
upper limit.
When the router forwards multicast data, it replicates a copy of the multicast data for each downstream
node and forwards the data. Each of these downstream nodes is a branch of the multicast distribution
tree.
You can configure the maximum number of downstream nodes (namely, the maximum number of
outgoing interfaces) for a single entry in the multicast forwarding table to lessen the burden on the router.
If the configured upper limit is smaller than the number of existing downstream nodes for a forwarding
entry, the downstream nodes in excess are not deleted immediately. The multicast routing protocol that
runs on the router will delete them. The router will no longer update the newly added downstream nodes
for the forwarding entry until the number of existing downstream nodes for the forwarding entry
decreases below the upper limit.
To configure the multicast forwarding table size:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Configure the maximum number of entries
in the multicast forwarding table.
multicast forwarding-table
route-limit limit
Optional.
The default is 4096.
3. Configure the maximum number of
downstream nodes for a single multicast
forwarding entry.
multicast forwarding-table
downstream-limit limit
Optional.
The default is 128.
Tracing a multicast path
You can use the mtracert command to trace the path down which the multicast traffic flows from a given
first-hop router to the last-hop router.
To trace a multicast path:
Task Command Remarks
Trace a multicast path.
mtracert source-address [ [ last-hop-router-address ]
group-address ]
Available in any view.