Displaying Available Routes for Reverse-Path Forwarding

Purpose

Display all available routes, only the routes to a particular destination, or routes associated with a specific unicast protocol that the router can use for RPF. You can specify the IP address and the network mask to view routes to a particular destination. You can also specify a unicast routing protocol to view routes associated with that protocol.

Action

To display all routes that the router can use for RPF:

host1#show ip rpf-route
Protocol/Route type codes:
  I1- ISIS level 1, I2- ISIS level2,
  I- route type intra, IA- route type inter, E- route type external,
  i- metric type internal, e- metric type external,
  O- OSPF, E1- external type 1, E2- external type2,
  N1- NSSA external type1, N2- NSSA external type2
  L- MPLS label, V- VR/VRF, *- indirect next-hop
  Prefix/Length    Type    Next Hop       Dist/Met   Intf
  -------------    ----    --------       --------   ------
  10.10.0.112/32    Static  192.168.1.1     1/1        fastEthernet0/0
  10.1.1.0/24       Connect 10.1.1.1        0/1        atm3/0.100
  25.25.25.25/32    Connect 25.25.25.25     0/1        loopback0

To display the best static routes added by network management to the routing table:

host1#show ip rpf-route static
Protocol/Route type codes:
  I1- ISIS level 1, I2- ISIS level2,
  I- route type intra, IA- route type inter, E- route type external,
  i- metric type internal, e- metric type external,
  O- OSPF, E1- external type 1, E2- external type2,
  N1- NSSA external type1, N2- NSSA external type2
  L- MPLS label, V- VR/VRF, *- indirect next-hop
 Prefix/Length  Type   Next Hop   Dist/Met  Intf
 -------------  ----   --------   --------  --------------
10.10.0.112/32  Static 192.168.1.1  1/1     fastEthernet0/0

Meaning

Table 5 lists the output fields of the show ip rpf-route command.

Table 5: show ip rpf-route Output Fields

Field Name

Field Description

Prefix

Value of the logical AND of the IP address of the destination network and the subnet address

Length

Length of the subnet mask in bits

Type

Protocol type for the interface:

  • Connect—Subnet directly connected to the interface
  • Static—Static route
  • protocol-name—Route learned through the named protocol

Next Hop

IP address of the next hop for this route

Dist

Distance configured for this route

Met

Learned or configured cost associated with this route

Intf

Type of interface and interface specifier for the next hop. For details about interface types and specifiers, see Interface Types and Specifiers in the JunosE Command Reference Guide.

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