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

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Figure 12: Sample Configuration for Next-Hop Verification
The ip route command is issued for each interface with the verify rtr and last-resort
keywords to establish the necessary static routes. (See Steps 6 and 7 in the next
section, “Configuring RTR Next-Hop Verification” on page 34.) This command causes
the results described in Table 6 on page 34, based on the status of the associated
RTR operations.
Table 6: Next-Hop Verification Results for Sample Configuration
Results RTR 11 Status RTR 10 Status
The router installs an equal-cost multipath (ECMP)
route to 10.1.1.2 in the routing table, using
Fast Ethernet interfaces 4/0 and 4/1 as the next hops. Up Up
The router installs a route to 10.1.1.2, using
Fast Ethernet interface 4/0 as the next hop. Down Up
The router installs a route to 10.1.1.2, using
Fast Ethernet interface 4/1 as the next hop. Up Down
Although both RTR operations are down, the last-resort
keyword instructs the router to install an ECMP route
to 10.1.1.2, using Fast Ethernet interfaces 4/0 and 4/1
as the next hops.
When all of the RTR operations associated with your
static routes are down, you can control which route
is installed in the routing table by including the
last-resort keyword in the ip route verify rtr command
only for the route that you want to install.
Down Down
The next section, “Configuring RTR Next-Hop Verification” on page 34, provides
instructions for configuring the example shown in Figure 12 on page 34.
Configuring RTR Next-Hop Verification
To configure the next-hop verification example shown in Figure 12 on page 34:
34 ■
IP Routing
JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide