summarization, redistribution, stub, virtual-link, and LSAs)
CramSaver
1. What global configuration command permits the configuration of
OPSFv3 or other IPv6 routing protocols? _________
2. What interface level command configures the interface for OSPF
version 3 using area 10 and a process ID of 1? _________
Answers
1. ipv6 unicast-routing
2. ipv6 ospf 1 area 10
If you can configure and verify OSPFv2, you are well on your way to a version 3 configuration for IPv6. In fact, things get a little more straightforward since there is no longer a network command you can use in version 3. Example 10.9 shows the multiple area configuration and verification on our topology from Figure 10.1.
EXAMPLE 10.9 Configuring and Verifying Multiple Area OSPF Version 3
Click here to view code image
R1#
R1#configure terminal
R1(config)#ipv6 unicast-routing
R1(config)#interface fa0/0
R1(config-if)#ipv6 ospf 1 area 0
R1(config-if)#interface lo0
R1(config-if)#ipv6 ospf 1 area 0
R1(config-if)#end
R1# R2#
R2#configure terminal
R2(config)#ipv6 unicast-routing
R2(config)#interface fa0/0
R2(config-if)#ipv6 ospf 1 area 0
R2(config-if)#interface fa1/0
R2(config-if)#ipv6 ospf 1 area 22
R2(config-if)#interface lo0
R2(config-if)#ipv6 ospf 1 area 0
R2# R3#
R3#configure terminal
R3(config)#ipv6 unicast-routing
R3(config)#int fa0/0
R3(config-if)#ipv6 ospf 1 area 22
R3(config-if)#interface lo0
R3(config-if)#ipv6 ospf 1 area 22
R3(config-if)#end
R3#ping 2001:11::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:11::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/58/96 ms
R3#
Notice that the ipv6 unicast-routing command is required. Cisco routers are IPv6 capable “out of the box,” but they will not route IPv6 traffic until they’re enabled for that. Also, realize in this configuration that a 32-bit router ID is used for these OSPF speaking devices. If your router does not possess a 32-bit IPv4 address, you must assign a router ID using the router-id command under the OPSF routing process.
ExamAlert
IPv6 routing protocols use the link-local address of their peers for next-hop information. You can prove this by examining an IPv6 routing table entry. For example:
O 2001:33::3/128 [110/1] via FE80::C804:28FF:FE5C:0, FastEthernet1/0
CramQuiz
1. What statement about OSPFv3 is true?
A. The dead timers do not need to match between neighbors. B. The hello timers do not need to match between neighbors. C. The area ID must match between neighbors.
D. The network command must be used.
2. What command can you use to verify neighbors in OSPFv3?
A. show ospfv3 neighbors B. show ipv6 ospf neighbors
C. show ospf database neighbors v3 D. show ospf peers version 3
CramQuiz Answers
1. C is correct. Area ID and hello and dead timers must match between neighbors in
OSPFv3.
2. B is correct. The show ipv6 ospf neighbors command permits the verification of
OSPFv3 peerings.
Topic: Configure, verify, and troubleshoot EIGRP for IPv4 (excluding
authentication, filtering, manual summarization, redistribution, and
stub)
CramSaver
1. What EIGRP for IPv4 command enables EIGRP for AS 100 on the
interface with the exact address 10.10.10.1? _________
2. What global configuration command enables EIGRP for AS 100 and
places you into router configuration mode? _________
Answers
1. network 10.10.10.1 0.0.0.0
2. router eigrp 100
The EIGRP for IPv4 configuration is quite simple. Example 10.10 demonstrates the configuration and verification of this scalable hybrid IGP.
EXAMPLE 10.10 Configuring and Verifying EIGRP for IPv4
Click here to view code image
R1#
R1#configure terminal
R1(config)#router eigrp 100
R1(config-router)#network 10.0.0.0 0.255.255.255 R1(config-router)#network 1.0.0.0 R1(config-router)#end R1# R2# R2#configure terminal
R2(config)#router eigrp 100
R2(config-router)#network 10.0.0.0
R2(config-router)#network 2.0.0.0
R2#
R3#
R3#configure terminal
R3(config)#router eigrp 100
R3(config-router)#network 3.0.0.0
R3(config-router)#network 10.0.0.0
R3(config-router)#end
R3#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.20.20.2 Fa0/0 14 00:01:09 28 200 0 8 R3#show ip route
Codes: L—local, C—connected, S—static, R—RIP, M—mobile, B—BGP D—EIGRP, EX—EIGRP external, O—OSPF, IA—OSPF inter area N1—OSPF NSSA external type 1, N2—OSPF NSSA external type 2
E1—OSPF external type 1, E2—OSPF external type 2
i—IS-IS, su—IS-IS summary, L1—IS-IS level-1, L2—IS-IS level-2
ia—IS-IS inter area, *—candidate default, U—per-user static
route
o—ODR, P—periodic downloaded static route, +— replicated route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks D 1.1.1.0/24 [90/158720] via 10.20.20.2, 00:01:13, FastEthernet0/0
D 2.2.2.0/24 [90/156160] via 10.20.20.2, 00:01:13, FastEthernet0/0
C 3.3.3.0/24 is directly connected, Loopback0 L 3.3.3.3/32 is directly connected, Loopback0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks D 10.10.10.0/24 [90/30720] via 10.20.20.2, 00:01:13, FastEthernet0/0
C 10.20.20.0/24 is directly connected, FastEthernet0/0 L 10.20.20.3/32 is directly connected, FastEthernet0/0 R3#ping 1.1.1.1
Type escape sequence to abort.
seconds: !!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/50/60 ms
R3#
Here, notice the following:
router eigrp 100: Here, the identifier is an AS number and must match for neighborship to form.
network 10.0.0.0 0.255.255.255: EIGRP permits the use of wildcard masks in the
network command, but it is not required.
With EIGRP for IPv4, there is no interface level command for the configuration; of course, for EIGRP for IPv6 there is only the interface level command, as shown in the next section
CramQuiz
1. What statement about EIGRP for IPv4 is true?
A. An AS is used in the configuration. B. The router code is E.
C. Cost is the administrative distance value.
D. The network command cannot use a wildcard mask.
2. What command can you use to verify neighbors in EIGRP for IPv4?
A. show eigrp neighbors B. show ipv4 eigrp neighbors C. show eigrp peerings
D. show ip eigrp neighbors
CramQuiz Answers
1. A is correct. EIGRP for IPv4 uses an AS number in the configuration.
2. D is correct. The show ip eigrp neighbors command permits the quick
verification of peerings.
Topic: Configure, verify, and troubleshoot EIGRP for IPv6 (excluding
authentication, filtering, manual summarization, redistribution, and
stub)
CramSaver
1. What command configures an interface for EIGRP for IPv6 using AS
_________
2. What EIGRP for IPv6 configuration command enables the process in
router configuration mode? _________
Answers
1. ipv6 eigrp 100
2. no shutdown
Example 10.11 shows the configuration and verification of EIGRP for IPv6. EXAMPLE 10.11 Configuring and Verifying EIGRP for IPv6
Click here to view code image
R1#
R1#configure terminal
R1(config)#ipv6 unicast-routing
R1(config)#interface fa0/0
R1(config-if)#ipv6 eigrp 100
R1(config-if)#interface lo0
R1(config-if)#ipv6 eigrp 100
R1(config-if)#ipv6 router eigrp 100
R1(config-rtr)#no shutdown
R1(config-rtr)#end
R1# R2#
R2#configure terminal
R2(config)#ipv6 unicast-routing
R2(config)#interface fa0/0
R2(config-if)#ipv6 eigrp 100
R2(config-if)#interface fa1/0
R2(config-if)#ipv6 eigrp 100
R2(config-if)#interface lo0
R2(config-if)#ipv6 eigrp 100
R2(config-if)#ipv6 router eigrp 100
R2(config-rtr)#no shutdown
R2(config-rtr)#end
R2# R3#
R3#configure terminal
R3(config)#ipv6 unicast-routing
R3(config)#interface fa0/0
R3(config-if)#ipv6 eigrp 100
R3(config-if)#interface lo0
R3(config-if)#ipv6 router eigrp 100
R3(config-rtr)#no shutdown
R3(config-rtr)#end
R3#ping 2001:11::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:11::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/56/76 ms
R3#
Notice in this configuration that you should ensure the EIGRP for IPv6 routing process is in the no shutdown state.
CramQuiz
1. What statement about EIGRP for IPv6 is true?
A. An AS is used in the configuration. B. The router code is E.
C. Cost is the administrative distance value.
D. The network command cannot use a wildcard mask.
2. What command can you use to verify neighbors in EIGRP for IPv6?
A. show eigrp ipv6 peerings B. show eigrp neighbors ipv6 C. show eigrp peerings ipv6 D. show ipv6 eigrp neighbors
CramQuiz Answers
1. A is correct. EIGRP for IPv6 uses an AS number in the configuration.
2. D is correct. The show ipv6 eigrp neighbors command permits the quick
verification of peerings.