Juniper JUNOSE 11.1.X MULTICAST ROUTING, Руководство по настройке

Страница: 154 / 270

Changing the Metric for a Route
The metric for DVMRP is hop count. For example, a route with two hops over a slow
serial line is preferable to a route with three hops over a faster optical line.
The router increases the number of DVMRP routes in incoming reports by a default
metric of one and in outgoing reports by a default of 0. You can change the metric
for an interface to promote or demote the preference for associated routes.
ip dvmrp metric-offset
■
Use to adjust the number of hops associated with a route. This action specifies
that the route is more efficient or less efficient than an alternative route.
■
Use the in keyword to specify the number of hops by which the router increases
the number of DVMRP routes advertised in incoming DVMRP reports. This option
is the default.
■
Use the out keyword to specify the number of hops by which the router increases
the number of DVMRP routes advertised in outgoing DVMRP reports.
■
Example
host1:boston(config-if)# ip dvmrp metric-offset in 3
■
Use the no version to revert to the default settings: 1 for incoming reports and
0 for outgoing reports.
■
See ip dvmrp metric-offset.
Importing Routes from Other Protocols
You can import routing information from other protocols into the DVMRP routing
table. Only routes that appear in the RPF table can be imported. To do so:
1.
If you want to use IS-IS, OSPF, or RIP routes, make those routes available to
multicast protocols. See “Defining Static Routes for Reverse-Path Forwarding”
on page 7.
2.
Access Router Configuration mode.
3.
Specify a route map.
4.
Import information from one type of routing domain into another.
redistribute
■
Use to import information from another type of routing domain to the DVMRP
domain. DVMRP can import only routes that appear in the RPF table.
■
Specify the source protocol from which routes are being redistributed. It can be
one of the following keywords:
bgp , isis , ospf , static , or connected .
■
Use the static keyword to redistribute static IP multicast routes into DVMRP.
132 ■
Changing the Metric for a Route
JUNOSe 11.1.x Multicast Routing Configuration Guide