D-Link xStack DGS-3600 Series User Manual - page 231
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Figure 8- 7 . DVMRP Interface Settings - Edit window
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The following fields can be set:
Parameter
Description
Interface Name
Displays the name of the IP interface for which DVMRP is to be configured. This must be a
previously defined IP interface.
IP Address
Displays the IP address corresponding to the IP Interface name entered above.
Neighbor Timeout
(1-65535 sec)
This field allows an entry between
1
and
65,535
seconds and defines the time period DVMRP
will hold Neighbor Router reports before issuing poison route messages. The default is
35
seconds
.
Probe Interval (1-
65535 sec)
This field allows an entry between
1
and
65,535
seconds and defines the interval between
‘probes’. The default is
10
seconds.
This field allows an entry between
1
and
31
and defines the route cost for the IP interface.
The DVMRP route cost is a relative number that represents the real cost of using this route in
the construction of a multicast delivery tree. It is similar to, but not defined as, the hop count
in RIP. The default cost is
1
.
State
This field can be toggled between
Enabled
and
Disabled
and enables or disables DVMRP for
the IP interface. The default is
Disabled
.
Metric (1-31)
Click
Apply
to implement changes made. Click
Show All DVMRP Interface Entries
to return to the
DVMRP Interface Settings
window.
PIM
PIM or Protocol Independent Multicast
is a method of forwarding traffic to multicast groups over the network using any pre-
existing unicast routing protocol, such as RIP or OSPF, set on routers within a multicast network. The Switch supports three types
of PIM, Dense Mode (PIM-DM), Sparse Mode (PIM-SM), and Sparse-Dense Mode (PIM-DM-SM).
PIM-SM
PIM-SM or
Protocol Independent Multicast – Sparse Mode is a method of forwarding multicast traffic over the network only to
multicast routers who actually request this information. Unlike most multicast routing protocols which flood the network with
multicast packets, PIM-SM will forward traffic to routers who are explicitly a part of the multicast group through the use of a
Rendezvous Point (RP). This RP will take all requests from PIM-SM enabled routers, analyze the information and then returns
multicast information it receives from the source, to requesting routers within its configured network. Through this method, a
distribution tree is created, with the RP as the root. This distribution tree holds all PIM-SM enabled routers within which
information collected from these routers are stored by the RP.
Two other types of routers also exist with the PIM-SM configuration. When many routers are a part of a multiple access network,
a Designated Router (DR) will be elected. The DR’s primary function is to send Join/Prune messages to the RP. The router with
the highest priority on the LAN will be selected as the DR. If there is a tie for the highest priority, the router with the higher IP
address will be chosen.
The third type of router created in the PIM-SM configuration is the Boot Strap Router (BSR). The goal of the Boot Strap Router is
to collect and relay RP information to PIM-SM enabled routers on the LAN. Although the RP can be statically set, the BSR
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