Specifying the IP address to use as the source address for PIM protocol
packets outbound on the VLAN
Syntax:
[no] ip pim-dense [ip-addr any |
sourceip-address
]
[no] vlan[
vid
]ip pim-dense [ip-addr | any |
sourceip-address
]
In networks using multinetted VLANs, all routers on a given VLAN intended to route multicast packets must have
a least one common subnet on that VLAN. Use this command when the VLAN is configured with multiple IP
addresses (multinetting) to specify the IP address to use as the source address for PIM protocol packets
outbound on the VLAN.
• Use
ip-address
to designate a single subnet in cases where multicast routers on the same multinetted
VLAN are not configured with identical sets of subnet IP addresses.
• Use
all
if the multinetted VLAN is configured with the same set of subnet addresses.
Default: the primary VLAN
Changing the frequency at which the routing switch transmits PIM hello
messages on the current VLAN
Syntax:
ip pim-dense [hello-interval 5-30]
vlan [
vid
]ip pim-dense [hello-interval 5-30]
Changes the frequency at which the routing switch transmit PIM hello messages on the current VLAN. The
routing switch uses hello packets to inform neighboring routers of its presence. The routing switch also uses this
setting to compute the hello hold time, which is included in hello packets sent to neighbor routers. hello hold time
tells neighbor routers how long to wait for the next hello packet from the routing switch. If another packet does not
arrive within that time, the router removes the neighbor adjacency on that VLAN from the routing table, which
removes any flows running on that interface.
Shortening the hello interval reduces the hello hold time. This has the effect of changing how quickly other routers
will stop sending traffic to the routing switch if they do not receive a new hello packet when expected.
NOTE:
Not used with the
[no]
form of the
ip pim-dense
command.
Example:
If multiple routers are connected to the same VLAN and the routing switch requests multicast traffic, all routers on
the VLAN receive that traffic. (Those that have pruned the traffic will drop it when they receive it.)
If the upstream router loses contact with the routing switch receiving the multicast traffic (that is, fails to receive a
hello packet when expected), the shorter hello interval causes it to stop transmitting multicast traffic onto the
VLAN sooner, resulting in less unnecessary bandwidth usage.
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Aruba 3810 / 5400R Multicast and Routing Guide for ArubaOS-
Switch 16.08
