Category Archives: 3.0 Routing Technologies

3.14 Troubleshoot basic Layer 3 end-to-end connectivity issues

The following commands are used to troubleshoot basic IP (L3) connectivity issues: ping traceroute “show”  commands The ping commands which stands for packet internet groper. It sends raw ICMP packets and is the most common use or testing links as it tests traffic it both directions. The various trace route commands show the hops that …

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3.13 Configure, verify, and troubleshoot RIPv2 for IPv4 (excluding authentication, filtering, manual summarization, redistribution)

Configuring RIP is very simple. The following commands configure RIP v2 and RIP for each network: Router(config)#router rip Router(config-router)#version 2 Router(config-router)#no auto-summary Router(config-router)#network 192.168.2.0 There is only two “show” commands for RIP: Router#show ip rip database 192.168.0.0/24 auto-summary 192.168.0.0/24 directly connected, FastEthernet0/0 192.168.1.0/24 auto-summary 192.168.1.0/24 [1] via 192.168.0.3, 00:00:09, FastEthernet0/0 192.168.2.0/24 auto-summary 192.168.2.0/24 directly connected, …

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3.12 Configure, verify, and troubleshoot EIGRP for IPv6 (excluding authentication, filtering, manual summarization, redistribution, stub)

Begin with this topology: First enable IPv6 routing, configure a router id (optional) and enable the EIGRP process: Router(config)#ipv6 unicast-routing Router(config)#ipv6 router eigrp 1 Router(config-rtr)#eigrp router-id 1.1.1.1 Router(config-rtr)#no shutdown   Next configure EIGRP on each interface: Router(config)#int g0/0 Router(config-if)#ipv6 address 2001:db8:0:0::/64 eui-64 Router(config-if)#ipv6 eigrp 1 Router(config-if)#no shutdown The show commands are similar but use “ipv6” …

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3.11 Configure, verify, and troubleshoot EIGRP for IPv4 (excluding authentication, filtering, manual summarization, redistribution, stub)

For the above topology the configuration is rather simple. In order for the routers to form neighbor relationships they must have the same EIGRP process id: R1 config: interface FastEthernet0/0 ip address 10.1.1.1 255.255.255.0 duplex half ! interface GigabitEthernet4/0 ip address 10.0.0.1 255.255.255.0 negotiation auto ! router eigrp 1 network 10.0.0.0 0.0.0.255 network 10.1.1.0 0.0.0.255 …

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3.10 Configure, verify, and troubleshoot single area and multi-area OSPFv3 for IPv6 (excluding authentication, filtering, manual summarization, redistribution, stub, virtual-link, and LSAs)

Starting with the following network: Configuring OSPFv3 for IPv6 is very similar to the IPv4 configuration: First configure a router ID and enable IPv6 routing: Router(config)ipv6 unicast-routing Router(config)#ipv6 router ospf 1 Router(config-rtr)#router-id 1.1.1.1 Building configuration… Configure interfaces and enable OSPFv3 on each interface: Router(config-if)#ipv6 address 2001:db8:0:3::/64 eui-64 Router(config-if)#ipv6 ospf 1 area 0 Router(config-if)#no shutdown Use …

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