Configuring Rtr Next-Hop Verification - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
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Table 6: Next-Hop Verification Results for Sample Configuration
(continued)
RTR 10 Status RTR 11 Status
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 33.

Configuring RTR Next-Hop Verification

To configure the next-hop verification example shown in Figure 12 on page 33:
Configure a loopback interface, and assign an IP address and mask to the interface.
1.
host1(config)#interface loopback 0
host1(config-if)#ip address 10.1.1.1 255.255.255.255
host1(config-if)#exit
Configure Fast Ethernet port 4/0 with an unnumbered primary IP interface associated
2.
with the loopback interface configured in Step 1.
host1(config)#interface fastEthernet 4/0
host1(config-if)#ip unnumbered loopback 0
host1(config-if)#exit
Repeat Step 2 for Fast Ethernet port 4/1.
3.
host1(config)#interface fastEthernet 4/1
host1(config-if)#ip unnumbered loopback 0
host1(config-if)#exit
Define probe RTR 10 for Fast Ethernet interface 4/0.
4.
a. Assign an operation number to the RTR probe, and access RTR Configuration mode.
For information, see "Configuring the Probe Type" on page 63.
host1(config)#rtr 10
host1(config-rtr)#
b. Configure the RTR probe as an echo type, and set the IP destination address and
source interface.
You must configure the RTR probe as an echo type to use next-hop verification.
For information, see "Configuring the Probe Type" on page 63.
host1(config-rtr)#type echo protocol ipIcmpEcho 10.1.1.2
source fastEthernet 4/0
c. Specify the interface on which the RTR probe expects to receive responses.
Results
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.
Copyright © 2010, Juniper Networks, Inc.