Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

Page: 234 / 454

Static Summary
Example
You can use the ip summary-address command to specify routes that RIP will
summarize.
host1(config-router)# ip summary-address 4.4.0.0 255.255.0.0 5
host1(config-router)# ip summary-address 4.3.0.0 255.255.0.0 6
Split Horizon
Split horizon is a mechanism to aid in preventing routing loops when distance-vector
routing protocols such as RIP are employed in broadcast networks. When split horizon
is enabled, the router cannot advertise information about routes on an interface from
which the information originates. Split horizon is enabled by default on the router.
You can disable split horizon and enable poison reverse routing updates that advertise
routes originating on the interface, but for each of these routes the metric is set to
infinity to explicitly advertise that these networks are not reachable.
Equal-Cost Multipath
RIP supports equal-cost multipath (ECMP) and installs into the routing table multiple
entries for paths to the same destination. Each of these multiple paths to a given
destination must have the same cost as the others, but a different next hop.
Applying Route Maps
You can apply a policy to redistributed routes with the route-map command. See
JUNOSe IP Services Configuration Guide , for more information about route maps. You
can use the table-map command to apply a route map to RIP routes that are about
to be added to the IP routing table.
Before You Run RIP
At least one IP address must be configured on your router for RIP to run.
Configuration Tasks
To configure RIP:
1.
Create a RIP process by enabling RIP.
host1(config)# router rip
2.
(Optional) Configure the global RIP version. RIPv1 is used by default.
host1(config-router)# version 2
3.
(Optional) Do one of the following:
■
Associate a network with a RIP routing process and optionally configure RIP
for the network.
210 ■
Before You Run RIP
JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide