81
Step 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.
By default, the upper limit is 4000
for the HPE 5800 switches, and
2000 for the HPE 5820X switches.
3.
Configure the maximum
number of downstream
nodes for a single multicast
forwarding entry.
multicast forwarding-table
downstream-limit
limit
Optional.
By default, the upper limit is 128.
Configuring the multicast forwarding table size in a VPN instance
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VPN instance view.
ip vpn-instance
vpn-instance-name
N/A
3.
Configure the maximum
number of entries in the
multicast forwarding table.
multicast forwarding-table
route-limit
limit
Optional.
By default, the upper limit is 4000
for the HPE 5800 switches, and
2000 for the HPE 5820X switches.
4.
Configure the maximum
number of downstream
nodes for a single route in
the multicast forwarding
table.
multicast forwarding-table
downstream-limit
limit
Optional.
By default, the upper limit 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.
Enabling multicast optimization
The establishment of multicast forwarding entries uses hash algorithm, which inevitably leads to
hash collisions. When hash collisions occur, multicast packets are lost because proper multicast
forwarding entries for them cannot be established.
To reduce the probability of hash collisions, you can enable the multicast optimization feature.
To enable multicast optimization:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
