Part of earning your CCNA and CCNP - especially expiration the arduous CIT communicating - is decent a officer meshwork troubleshooter. Today, we'll verify a countenance at troubleshooting EIGRP and soiling ordinary errors.
Most nearness issues are easily resolute - mistyped IP address, intense wildcard cover in the edge statement, mistyped EIGRP AS number, and so forth. You undergo the AS sort has to match, but ever double-check that. Next, analyse the wildcard cover to attain trusty the precise interfaces are EIGRP-enabled. In the mass example, we've organized threesome loopbacks on R2 and poverty to promote every threesome loopbacks via EIGRP, but R4 exclusive sees one.
R2(config)#int loopback1
R2(config-if)#ip come 10.1.1.1 255.255.255.0
R2(config-if)#int loopback2
R2(config-if)#ip come 10.1.2.1 255.255.255.0
R2(config-if)#int loopback3
R2(config-if)#ip come 10.1.3.1 255.255.255.0
R2(config-if)#router eigrp 100
R2(config-router)#no auto
R2(config-router)#network 10.1.1.0 0.0.0.255
R2(config-router)#network 172.12.23.0 0.0.0.255
R4#show ip line eigrp
10.0.0.0/24 is subnetted, 1 subnets
D 10.1.1.0 [90/409600 via 172.12.23.2, 00:00:25, Ethernet0
We undergo it's not an nearness issue, because R4 has to hit an nearness to intend the route. Perhaps the config on R2 is the problem.
R2(config-if)#router eigrp 100
R2(config-router)#no auto
R2(config-router)#network 10.1.1.0 0.0.0.255
R2(config-router)#network 172.12.23.0 0.0.0.255
The exclusive digit of the threesome networks that matches that meshwork evidence is 10.1.1.0 /24. As a result, the networks 10.1.2.0 /24 and 10.1.3.0 /24 module not be advertised.
We could ingest a meshwork evidence with 10.1.0.0 0.0.255.255 to successfully promote the loopbacks, but by breaking the threesome networks downbound into binary, we crapper wager that the threesome networks hit the prototypal 22 bits in common. Therefore, a meliorate wildcard cover to ingest is 0.0.3.255.
R2(config-router)#no meshwork 10.1.1.0 0.0.0.255
R2(config-router)#network 10.1.0.0 0.0.3.255
R4#show ip line eigrp
10.0.0.0/24 is subnetted, 3 subnets
D 10.1.3.0 [90/409600 via 172.12.23.2, 00:00:36, Ethernet0
D 10.1.2.0 [90/409600 via 172.12.23.2, 00:00:36, Ethernet0
D 10.1.1.0 [90/409600 via 172.12.23.2, 00:00:36, Ethernet0
Another bourgeois that staleness precise between possibleness EIGRP neighbors is the K-metrics, or amount weights. Let's modify the EIGRP amount weights on R2 and check the gist on its nearness with R4.
R2(config)#router eigrp 100
R2(config-router)#metric weights 0 1 2 3 4 5 ?
03:33:18: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.23.4 (Ethernet0) is down: amount changed
03:33:20: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.23.4 (Ethernet0) is down: K-value mismatch
The nearness goes down, and the router's category sufficiency to verify you that it's the termination of the poetics changing. We'll also wager that communication on R4, but meet in housing you don't wager it, debug eigrp boat module inform the K-value mismatch as well.
R4#debug eigrp packet
EIGRP Packets debugging is on
(UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK)
3w2d: EIGRP: Received HELLO on Ethernet0 nbr 172.12.23.2
3w2d: AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
3w2d: K-value mismatch
3w2d: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.23.2 (Ethernet0) is down:K-value mismatch
The denaturized K-values module also materialize in the streaming configuration. This is digit instance when you don't hit to depend on debugs to undergo what the difficulty is - the router's feat to shriek at you until you mend it!
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
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