RIPng Troubleshooting Cisco CCNA Course Training in Gurgaon Delhi

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 Just as OSPFv3 supports IPv6 routes while OSPFv2 does not, RIPng supports IPv6 routes,
whereas RIP versions 1 and 2 do not. This section reviews RIPng theory, provides a collection
of RIPng configuration commands, shows a sample configuration, offers a collection
of helpful RIPng troubleshooting commands, and lists common RIPng troubleshooting
issues.
Review RIPng Theory
RIPng is an enhancement to RIPv2; however, RIPng does have several characteristics similar
to RIPv2, as follows:
■ Distance-vector routing protocol
■ Hop count metric
■ Maximum hop count of fifteen
■ Sends routing updates via multicast:
■ RIPv2: 224.0.0.9
■ RIPng: FF02::9
The following characteristics are enhancements of RIPng over RIPv2:
■ Supports the routing of 128-bit IPv6 network addresses.
■ Link-local addresses used for next-hop addresses.
■ Next-hop addresses stored in Routing Information Base (RIB).
■ Interfaces added to a RIP routing process in interface-configuration mode
(as opposed to router configuration mode).
RIPng Configuration Commands
Similar to OSPFv3, RIPng uses interface configuration mode to tell an interface to participate
in a RIP routing process. This is as opposed to RIPv1’s and RIPv2’s approach to using
the network command in router configuration mode to configure an interface to participate
in a RIP routing process.

Table 12-6 RIPng Configuration Commands
Command Description
ipv6 rip process-name enable Interface configuration mode command that instructs an
interface to participate in the specified RIPng routing
process.
ipv6 rip process-name default-information
{only | originate}
Interface configuration mode command that causes an
interface to originate a default route advertisement (that
is, an advertisement for network ::/0) and optionally suppress
the advertisement of all other routes (using the
only keyword).
ipv6 router rip process-name Global configuration mode command that enters router
configuration mode for the specified RIPng routing
process.
maximum-paths number Interface configuration mode command that specifies
the number of equal-cost paths across which RIPng can
load balance (defaults to 16 with a valid range of 1-64).
Example 12-24 shows a sample RIPng configuration on a router (that is, router R1), which
is illustrated in Figure 12-7. Notice that an interface can simultaneously be configured
with both IPv4 and IPv6 addresses. Also, notice the ipv6 rip PROCESS1 enable command
issued in interface configuration mode. This command causes an interface to participate
in the RIPng routing process named PROCESS1.
B:B:B:B::X/64
192.168.0.0/24
192.168.1.0/24
.11
Fa0/1 Fa0/0 Fa0/0
.11 .22 Fa0/1
R1 R2 .22
A:A:A:A::X/64
C:C:C:C::X/64
10.1.1.0/24
Figure 12-7 RIPng Sample Configuration Topology
Table 12-6 provides basic RIPng configuration commands.

R1# show run Topic
...OUTPUT OMITTED...
hostname R1
!
ipv6 unicast-routing
ipv6 cef
!
interface FastEthernet0/0
ip address 192.168.1.11 255.255.255.0
ipv6 address A:A:A:A::11/64
ipv6 rip PROCESS1 enable
!
interface FastEthernet0/1
ip address 192.168.0.11 255.255.255.0
ipv6 address B:B:B:B::11/64
ipv6 rip PROCESS1 enable
!
ipv6 router rip PROCESS1
...OUTPUT OMITTED...
Troubleshooting RIPng
When troubleshooting a RIPng issue, you can take advantage of your RIPv1 and RIPv2
knowledge. Many commands used to troubleshoot RIPv1 and RIPv2 can be used for troubleshooting
RIPng by simply replacing the ip keyword in a show command with a keyword
of ipv6. For example, instead of using the RIPv2 show ip rip database command,
you could use the show ipv6 rip database command in a network running RIPng. Table
12-7 provides a command reference of commonly used commands for troubleshooting
RIPng issues.
Key
Topic
Table 12-7 RIPng Troubleshooting Commands
Command Description
show ipv6 rip [processname]
[database | next-hops]
Displays information about the specified RIPng routing
process, and optionally the contents of the RIPng database
and a listing of next-hop addresses.
show ipv6 route Shows the contents of the IPv6 routing table.
debug ipv6 rip Provides real-time information about RIPng messages.
Example 12-24 Sample RIPng Configuration
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Following is a listing of common RIPng issues you might encounter:
■ RIPng routes not appearing in the IPv6 routing table
■ RIPng not performing appropriate load balancing
■ Interface not sending RIPng updates
■ Individual network advertisements not suppressed when sourcing a default route
Trouble Ticket: IPv6 and RIPng
This section presents a trouble ticket based on an IPv6 and RIPng configuration. You are
given sample show command output and are challenged to identify a resolution for the issue
described.
Trouble Ticket #12
You receive the following trouble ticket:
Company A (that is, routers R1 and R2) is dual-homed to two Internet service
providers (ISPs). The ISP routers are BB1 and BB2. However, router R2 only sees a single
path to reach a default route (rather than one path from each ISP) in its IPv6 routing
table. Also, router R2 is seeing other ISP-advertised routes (specifically,
E:E:E:E::/64 and F:F:F:F::/64) rather than just a default route in its IPv6 routing table.
All routes that router R2 receives from the ISP routers, except a default route, should
be suppressed (see Figure 12-8).
Viewing Baseline Information
All routers in the shown topology have been configured with IPv6 addressing on their
physical interfaces and subinterfaces. Routers R1 and R2 are considered to be enterprise
routers, whereas routers BB1 and BB2 are considered to be Internet service provider (ISP)
routers, with whom the enterprise is dual homed.
The backbone ISP routers are configured to only send IPv6 default route advertisements
(that is, advertisements for route ::/0) to the enterprise routers. Therefore, routers R1 and
R2 do not have entries for the E:E:E:E::/64 and F:F:F:F::/64 networks. Router R1’s configuration,
which is representative of the basic IPv6 and RIPng configuration present on all the
routers in the topology, is presented in Example 12-25.
Example 12-25 Running Configuration on Router R1
R1# show run
...OUTPUT OMITTED...
hostname R1
!
ipv6 unicast-routing
ipv6 cef